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P/+ADEXt1
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_27.ADF |
| Filename: | P/+ADEXt1 |
| Read OK: | ✔ |
| File size: | 168D bytes |
| Load address: | 2B204556 |
| Exec address: | 58454441 |
File contents
ADFSEXPO M/CODE VERSION ~~~~~~~~~~~~~~~~~~~~~~~ By Richard Dimond As promised in my earlier description of the BASIC version, I now submit the M/code version. This is not only quicker in operation, it is easier to use as it is run with a * command. Also being coded, it can be used with the AutoRom program or could be written for storing in SW RAM. In doing the coding I have made some small improvements. I have turned the flashing cursor off as this is not needed and when quitting the program, the Elk is returned to MODE 6. The code is assembled at Q% with addresses for P% at &2000. This is done using OPTs 4 - 6 as in my Mr Miner program but the DIM Q% &1000 (line90) reserves the space for the code above TOP. This allows the code to be set up whether PAGE is at &E00 or &1D00. The addresses for the variables are set in lines 140 - 180. Some addresses are used for two variables but this doesn't matter as these are not used at the same time. I will just describe in detail the parts which have not been covered before and explain these in the order they occur, referring to the lines which create the code. Lines 220 - 270 create the opening screen as described in my tutorial series. Lines 270,290 stop the program until RETURN is pressed. Line 280 allows you to exit the program by pressing ESCAPE as this sets the carry flag and then the code returns to BASIC. The routine 'readdisc', lines 600 - 630, first gives the command *MOUNT. This uses the OS routine OSCLI (&FFF7) with X and Y registers pointing to the address of the command data at line 2810. OSWORD with A register=&72 is used with parameter block (line 2800) set as in the BASIC version. This reads the two sectors of the fs map to the address W%. I have set this to an address just below the screen memory area. This can be altered if it is not convenient simply by altering the value of W% and re-assembling the code. Line 300 sets COLUUR 2 to Blue and turns off the cursor. The routine 'vars' (lines1100 - 1260) is next called. This first finds the value in address W%+&1FE (X%+Y) and stores this in 'size'. This is the number of used sections of the disc. The two bytes at W%+&FE are found and stored in the two bytes of 'sectors'. They are also stored in 'tracks' and then the bits manipulated (lines 1160 - 1190) to divide the value by 16 to give the number of tracks. The BASIC program then divided by 80 to give the number of sides. This is not so easy to do in m/code and also, having a disc that would only format completely as a 40 track disc, I found this then gave sides as 0!! I then thought that tracks can only have the values 160, 80 or 40. So I have compared tracks with 160 and if equal 2 is printed and, if not equal, to print 1 (lines 1200 - 1220) - much simpler!! The value of sectors is also stored at discsize+1 and +2. This gives the value of discsize as sectors*256, ie the number of bytes on the disc. Line 1250 sets up the character number 224 using VDU23. A comparison is made of the value of sides and, if equal to 1 the character bytes are 224, and 192 if not. This gives a narrower character for a double sided disc. The routine 'grid' (lines 1300 -1690) is rather complex but consists of several sections. Line 1310 uses the data 'd4' (line 2840), first to set the background colour to red and setting the graphics window. After the window is cleared, the screen is returned normal. The foreground colour is then set to white and the background to black. The two sections lines 1320 - 1400 and 1410 - 1490, print the grid using the routine 'plotpt' to set the plot points. The first draws the vertical lines. The number of lines to be drawn are loaded into 'count' and the four co-ordinate bytes of the variable 'plot' are set to zero (line 1420). The loop 'vlp' then draws the lines. The two calls to the routine "plotpt' change the Y co-ords to draw a line on the X co-ord (initially zero). The X co-ord is increased by adding 16 each time round the loop and 'count' decreased until this is zero and then the second section draws the horizontal lines in the same way. The third section (lines 1500 - 1690) prints the track numbers and short vertical lines underneath. Line 1510 sets count to 8, the X co-ord, hex and trkno to zero. The number of sides is then checked, if this is two, the variable 'diff' is equal to 20 otherwise it equal to 10. The loop 'vlp2' first draws the short line using 'plotpt' then the value in trkno is compared and if equal to zero, a zero is printed (lines 1570 - 1590). The value of 'diff' is added and 192 added to the X co-ord before looping back to 'vlp2'. Since trkno is not zero, the track numbers are now printed using the routine 'decprt' (lines 650 - 1090). This routine for printing a decimal number was a routine given in the Micro User Sep 1990. This is used complete as I do not know another routine to do this. The comparison in line 1640 stops the printing of the final track number and ends the routine. The routine 'info' prints the tracks heading and the remaining printing as before using data lines 2850 & 2860 and the 'decprt' routine for printing the values. The routine 'key' prints the key to the colours. For each of the four colours, the co-ords X and Y and the two colour numbers C1 and C2 are set before the routine 'sqr' is called. This sets the colour C1 for key and draws a solid square by using PLOT code 85 twice. The colour is changed to C2 and the outline drawn. The program returns to 'info' for the printing.
00000000 0d 41 44 46 53 45 58 50 4f 20 4d 2f 43 4f 44 45 |.ADFSEXPO M/CODE| 00000010 20 56 45 52 53 49 4f 4e 0d 7e 7e 7e 7e 7e 7e 7e | VERSION.~~~~~~~| 00000020 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e |~~~~~~~~~~~~~~~~| 00000030 0d 42 79 20 52 69 63 68 61 72 64 20 44 69 6d 6f |.By Richard Dimo| 00000040 6e 64 0d 0d 41 73 1a 20 70 72 6f 6d 69 73 65 64 |nd..As. promised| 00000050 1a 20 69 6e 20 6d 79 20 65 61 72 6c 69 65 72 20 |. in my earlier | 00000060 64 65 73 63 72 69 70 74 69 6f 6e 20 6f 66 20 74 |description of t| 00000070 68 65 20 42 41 53 49 43 20 76 65 72 73 69 6f 6e |he BASIC version| 00000080 2c 20 49 20 6e 6f 77 20 73 75 62 6d 69 74 0d 74 |, I now submit.t| 00000090 68 65 20 4d 2f 63 6f 64 65 20 76 65 72 73 69 6f |he M/code versio| 000000a0 6e 2e 0d 0d 54 68 69 73 20 69 73 20 6e 6f 74 20 |n...This is not | 000000b0 6f 6e 6c 79 20 71 75 69 63 6b 65 72 1a 20 69 6e |only quicker. in| 000000c0 1a 20 6f 70 65 72 61 74 69 6f 6e 2c 1a 20 69 74 |. operation,. it| 000000d0 20 69 73 20 65 61 73 69 65 72 20 74 6f 20 75 73 | is easier to us| 000000e0 65 20 61 73 20 69 74 20 69 73 20 72 75 6e 0d 77 |e as it is run.w| 000000f0 69 74 68 20 61 20 2a 20 63 6f 6d 6d 61 6e 64 2e |ith a * command.| 00000100 20 20 41 6c 73 6f 20 62 65 69 6e 67 20 63 6f 64 | Also being cod| 00000110 65 64 2c 20 69 74 1a 20 63 61 6e 1a 20 62 65 1a |ed, it. can. be.| 00000120 20 75 73 65 64 1a 20 77 69 74 68 1a 20 74 68 65 | used. with. the| 00000130 1a 20 41 75 74 6f 52 6f 6d 0d 70 72 6f 67 72 61 |. AutoRom.progra| 00000140 6d 20 6f 72 20 20 63 6f 75 6c 64 20 62 65 20 77 |m or could be w| 00000150 72 69 74 74 65 6e 20 66 6f 72 20 73 74 6f 72 69 |ritten for stori| 00000160 6e 67 20 69 6e 20 53 57 20 52 41 4d 2e 0d 0d 49 |ng in SW RAM...I| 00000170 6e 20 64 6f 69 6e 67 20 74 68 65 20 63 6f 64 69 |n doing the codi| 00000180 6e 67 20 49 1a 20 68 61 76 65 1a 20 6d 61 64 65 |ng I. have. made| 00000190 1a 20 73 6f 6d 65 20 73 6d 61 6c 6c 20 69 6d 70 |. some small imp| 000001a0 72 6f 76 65 6d 65 6e 74 73 2e 20 20 49 20 68 61 |rovements. I ha| 000001b0 76 65 20 74 75 72 6e 65 64 0d 74 68 65 1a 20 66 |ve turned.the. f| 000001c0 6c 61 73 68 69 6e 67 1a 20 63 75 72 73 6f 72 20 |lashing. cursor | 000001d0 6f 66 66 20 61 73 20 74 68 69 73 20 69 73 20 6e |off as this is n| 000001e0 6f 74 1a 20 6e 65 65 64 65 64 1a 20 61 6e 64 1a |ot. needed. and.| 000001f0 20 77 68 65 6e 1a 20 71 75 69 74 74 69 6e 67 1a | when. quitting.| 00000200 20 74 68 65 0d 70 72 6f 67 72 61 6d 2c 20 74 68 | the.program, th| 00000210 65 20 45 6c 6b 20 69 73 20 72 65 74 75 72 6e 65 |e Elk is returne| 00000220 64 20 74 6f 20 4d 4f 44 45 20 36 2e 0d 0d 54 68 |d to MODE 6...Th| 00000230 65 20 63 6f 64 65 20 69 73 20 61 73 73 65 6d 62 |e code is assemb| 00000240 6c 65 64 20 61 74 20 51 25 20 77 69 74 68 20 61 |led at Q% with a| 00000250 64 64 72 65 73 73 65 73 20 66 6f 72 20 50 25 20 |ddresses for P% | 00000260 61 74 20 26 32 30 30 30 2e 1a 20 20 54 68 69 73 |at &2000.. This| 00000270 20 69 73 20 64 6f 6e 65 0d 75 73 69 6e 67 20 4f | is done.using O| 00000280 50 54 73 20 34 20 2d 20 36 1a 20 61 73 1a 20 69 |PTs 4 - 6. as. i| 00000290 6e 20 6d 79 20 4d 72 20 4d 69 6e 65 72 20 70 72 |n my Mr Miner pr| 000002a0 6f 67 72 61 6d 20 62 75 74 20 74 68 65 20 44 49 |ogram but the DI| 000002b0 4d 20 51 25 20 26 31 30 30 30 20 28 6c 69 6e 65 |M Q% &1000 (line| 000002c0 39 30 29 0d 72 65 73 65 72 76 65 73 20 74 68 65 |90).reserves the| 000002d0 20 73 70 61 63 65 20 66 6f 72 20 74 68 65 20 63 | space for the c| 000002e0 6f 64 65 20 61 62 6f 76 65 20 54 4f 50 2e 20 20 |ode above TOP. | 000002f0 54 68 69 73 20 61 6c 6c 6f 77 73 20 74 68 65 20 |This allows the | 00000300 63 6f 64 65 20 74 6f 20 62 65 20 73 65 74 0d 75 |code to be set.u| 00000310 70 20 77 68 65 74 68 65 72 20 50 41 47 45 20 69 |p whether PAGE i| 00000320 73 20 61 74 20 26 45 30 30 20 6f 72 20 26 31 44 |s at &E00 or &1D| 00000330 30 30 2e 0d 0d 54 68 65 1a 20 61 64 64 72 65 73 |00...The. addres| 00000340 73 65 73 1a 20 66 6f 72 1a 20 74 68 65 1a 20 76 |ses. for. the. v| 00000350 61 72 69 61 62 6c 65 73 1a 20 61 72 65 1a 20 73 |ariables. are. s| 00000360 65 74 1a 20 69 6e 1a 20 6c 69 6e 65 73 1a 20 31 |et. in. lines. 1| 00000370 34 30 20 2d 20 31 38 30 2e 20 20 53 6f 6d 65 0d |40 - 180. Some.| 00000380 61 64 64 72 65 73 73 65 73 20 61 72 65 20 75 73 |addresses are us| 00000390 65 64 20 66 6f 72 20 74 77 6f 20 76 61 72 69 61 |ed for two varia| 000003a0 62 6c 65 73 20 62 75 74 20 74 68 69 73 20 64 6f |bles but this do| 000003b0 65 73 6e 27 74 20 6d 61 74 74 65 72 1a 20 61 73 |esn't matter. as| 000003c0 20 74 68 65 73 65 20 61 72 65 0d 6e 6f 74 20 75 | these are.not u| 000003d0 73 65 64 20 61 74 20 74 68 65 20 73 61 6d 65 20 |sed at the same | 000003e0 74 69 6d 65 2e 0d 0d 49 20 77 69 6c 6c 20 6a 75 |time...I will ju| 000003f0 73 74 20 64 65 73 63 72 69 62 65 20 69 6e 1a 20 |st describe in. | 00000400 64 65 74 61 69 6c 1a 20 74 68 65 1a 20 70 61 72 |detail. the. par| 00000410 74 73 1a 20 77 68 69 63 68 1a 20 68 61 76 65 1a |ts. which. have.| 00000420 20 6e 6f 74 20 62 65 65 6e 20 63 6f 76 65 72 65 | not been covere| 00000430 64 0d 62 65 66 6f 72 65 20 61 6e 64 20 65 78 70 |d.before and exp| 00000440 6c 61 69 6e 20 74 68 65 73 65 20 69 6e 20 74 68 |lain these in th| 00000450 65 20 6f 72 64 65 72 20 74 68 65 79 20 6f 63 63 |e order they occ| 00000460 75 72 2c 20 72 65 66 65 72 72 69 6e 67 20 74 6f |ur, referring to| 00000470 1a 20 74 68 65 1a 20 6c 69 6e 65 73 0d 77 68 69 |. the. lines.whi| 00000480 63 68 20 63 72 65 61 74 65 20 74 68 65 20 63 6f |ch create the co| 00000490 64 65 2e 0d 0d 4c 69 6e 65 73 1a 20 32 32 30 1a |de...Lines. 220.| 000004a0 20 2d 1a 20 32 37 30 20 63 72 65 61 74 65 20 74 | -. 270 create t| 000004b0 68 65 20 6f 70 65 6e 69 6e 67 20 73 63 72 65 65 |he opening scree| 000004c0 6e 20 61 73 20 64 65 73 63 72 69 62 65 64 20 69 |n as described i| 000004d0 6e 1a 20 6d 79 1a 20 74 75 74 6f 72 69 61 6c 0d |n. my. tutorial.| 000004e0 73 65 72 69 65 73 2e 20 20 4c 69 6e 65 73 20 32 |series. Lines 2| 000004f0 37 30 2c 32 39 30 20 73 74 6f 70 20 74 68 65 20 |70,290 stop the | 00000500 70 72 6f 67 72 61 6d 20 75 6e 74 69 6c 20 52 45 |program until RE| 00000510 54 55 52 4e 20 69 73 20 70 72 65 73 73 65 64 2e |TURN is pressed.| 00000520 20 20 4c 69 6e 65 20 32 38 30 0d 61 6c 6c 6f 77 | Line 280.allow| 00000530 73 20 79 6f 75 20 74 6f 20 65 78 69 74 1a 20 74 |s you to exit. t| 00000540 68 65 1a 20 70 72 6f 67 72 61 6d 20 62 79 20 70 |he. program by p| 00000550 72 65 73 73 69 6e 67 20 45 53 43 41 50 45 20 61 |ressing ESCAPE a| 00000560 73 20 74 68 69 73 20 73 65 74 73 20 74 68 65 20 |s this sets the | 00000570 63 61 72 72 79 0d 66 6c 61 67 20 61 6e 64 20 74 |carry.flag and t| 00000580 68 65 6e 20 74 68 65 20 63 6f 64 65 20 72 65 74 |hen the code ret| 00000590 75 72 6e 73 20 74 6f 20 42 41 53 49 43 2e 0d 0d |urns to BASIC...| 000005a0 54 68 65 20 72 6f 75 74 69 6e 65 20 27 72 65 61 |The routine 'rea| 000005b0 64 64 69 73 63 27 2c 20 6c 69 6e 65 73 20 36 30 |ddisc', lines 60| 000005c0 30 20 2d 1a 20 36 33 30 2c 20 66 69 72 73 74 1a |0 -. 630, first.| 000005d0 20 67 69 76 65 73 20 74 68 65 20 63 6f 6d 6d 61 | gives the comma| 000005e0 6e 64 20 2a 4d 4f 55 4e 54 2e 20 0d 54 68 69 73 |nd *MOUNT. .This| 000005f0 20 75 73 65 73 20 74 68 65 20 4f 53 20 72 6f 75 | uses the OS rou| 00000600 74 69 6e 65 20 4f 53 43 4c 49 20 28 26 46 46 46 |tine OSCLI (&FFF| 00000610 37 29 20 77 69 74 68 1a 20 58 20 61 6e 64 20 59 |7) with. X and Y| 00000620 20 72 65 67 69 73 74 65 72 73 20 70 6f 69 6e 74 | registers point| 00000630 69 6e 67 20 74 6f 0d 74 68 65 20 61 64 64 72 65 |ing to.the addre| 00000640 73 73 20 6f 66 20 74 68 65 20 63 6f 6d 6d 61 6e |ss of the comman| 00000650 64 20 64 61 74 61 20 61 74 20 6c 69 6e 65 20 32 |d data at line 2| 00000660 38 31 30 2e 20 20 20 4f 53 57 4f 52 44 20 77 69 |810. OSWORD wi| 00000670 74 68 20 41 20 72 65 67 69 73 74 65 72 3d 26 37 |th A register=&7| 00000680 32 0d 69 73 20 75 73 65 64 20 77 69 74 68 20 70 |2.is used with p| 00000690 61 72 61 6d 65 74 65 72 20 62 6c 6f 63 6b 1a 20 |arameter block. | 000006a0 28 6c 69 6e 65 1a 20 32 38 30 30 29 1a 20 73 65 |(line. 2800). se| 000006b0 74 1a 20 61 73 1a 20 69 6e 20 74 68 65 20 42 41 |t. as. in the BA| 000006c0 53 49 43 20 76 65 72 73 69 6f 6e 2e 20 0d 54 68 |SIC version. .Th| 000006d0 69 73 20 72 65 61 64 73 20 74 68 65 20 74 77 6f |is reads the two| 000006e0 20 73 65 63 74 6f 72 73 20 6f 66 20 74 68 65 20 | sectors of the | 000006f0 66 73 20 6d 61 70 20 74 6f 1a 20 74 68 65 1a 20 |fs map to. the. | 00000700 61 64 64 72 65 73 73 1a 20 57 25 2e 20 20 49 20 |address. W%. I | 00000710 68 61 76 65 20 73 65 74 0d 74 68 69 73 20 74 6f |have set.this to| 00000720 20 61 6e 20 61 64 64 72 65 73 73 20 6a 75 73 74 | an address just| 00000730 20 62 65 6c 6f 77 20 74 68 65 20 73 63 72 65 65 | below the scree| 00000740 6e 20 6d 65 6d 6f 72 79 20 61 72 65 61 2e 20 20 |n memory area. | 00000750 54 68 69 73 20 63 61 6e 20 62 65 20 61 6c 74 65 |This can be alte| 00000760 72 65 64 0d 69 66 1a 20 69 74 1a 20 69 73 1a 20 |red.if. it. is. | 00000770 6e 6f 74 1a 20 63 6f 6e 76 65 6e 69 65 6e 74 1a |not. convenient.| 00000780 20 73 69 6d 70 6c 79 1a 20 62 79 1a 20 61 6c 74 | simply. by. alt| 00000790 65 72 69 6e 67 1a 20 74 68 65 1a 20 76 61 6c 75 |ering. the. valu| 000007a0 65 1a 20 6f 66 1a 20 57 25 1a 20 61 6e 64 0d 72 |e. of. W%. and.r| 000007b0 65 2d 61 73 73 65 6d 62 6c 69 6e 67 20 74 68 65 |e-assembling the| 000007c0 20 63 6f 64 65 2e 0d 0d 4c 69 6e 65 20 33 30 30 | code...Line 300| 000007d0 20 73 65 74 73 20 43 4f 4c 55 55 52 20 32 20 74 | sets COLUUR 2 t| 000007e0 6f 20 42 6c 75 65 20 61 6e 64 20 74 75 72 6e 73 |o Blue and turns| 000007f0 20 6f 66 66 20 74 68 65 20 63 75 72 73 6f 72 2e | off the cursor.| 00000800 0d 0d 54 68 65 20 72 6f 75 74 69 6e 65 20 27 76 |..The routine 'v| 00000810 61 72 73 27 20 28 6c 69 6e 65 73 31 31 30 30 20 |ars' (lines1100 | 00000820 2d 1a 20 31 32 36 30 29 1a 20 69 73 1a 20 6e 65 |-. 1260). is. ne| 00000830 78 74 20 63 61 6c 6c 65 64 2e 20 20 54 68 69 73 |xt called. This| 00000840 20 66 69 72 73 74 20 66 69 6e 64 73 0d 74 68 65 | first finds.the| 00000850 20 76 61 6c 75 65 20 69 6e 20 61 64 64 72 65 73 | value in addres| 00000860 73 20 57 25 2b 26 31 46 45 20 28 58 25 2b 59 29 |s W%+&1FE (X%+Y)| 00000870 20 61 6e 64 20 73 74 6f 72 65 73 1a 20 74 68 69 | and stores. thi| 00000880 73 1a 20 69 6e 1a 20 27 73 69 7a 65 27 2e 20 20 |s. in. 'size'. | 00000890 54 68 69 73 20 69 73 0d 74 68 65 1a 20 6e 75 6d |This is.the. num| 000008a0 62 65 72 1a 20 6f 66 20 75 73 65 64 20 73 65 63 |ber. of used sec| 000008b0 74 69 6f 6e 73 20 6f 66 20 74 68 65 20 64 69 73 |tions of the dis| 000008c0 63 2e 20 20 54 68 65 20 74 77 6f 20 62 79 74 65 |c. The two byte| 000008d0 73 1a 20 61 74 1a 20 57 25 2b 26 46 45 1a 20 61 |s. at. W%+&FE. a| 000008e0 72 65 0d 66 6f 75 6e 64 20 61 6e 64 20 73 74 6f |re.found and sto| 000008f0 72 65 64 1a 20 69 6e 1a 20 74 68 65 20 74 77 6f |red. in. the two| 00000900 20 62 79 74 65 73 20 6f 66 20 27 73 65 63 74 6f | bytes of 'secto| 00000910 72 73 27 2e 20 20 54 68 65 79 20 61 72 65 20 61 |rs'. They are a| 00000920 6c 73 6f 20 73 74 6f 72 65 64 20 69 6e 0d 27 74 |lso stored in.'t| 00000930 72 61 63 6b 73 27 20 61 6e 64 20 74 68 65 6e 20 |racks' and then | 00000940 74 68 65 20 62 69 74 73 1a 20 6d 61 6e 69 70 75 |the bits. manipu| 00000950 6c 61 74 65 64 1a 20 28 6c 69 6e 65 73 20 31 31 |lated. (lines 11| 00000960 36 30 20 2d 20 31 31 39 30 29 20 74 6f 20 64 69 |60 - 1190) to di| 00000970 76 69 64 65 20 74 68 65 0d 76 61 6c 75 65 20 62 |vide the.value b| 00000980 79 20 31 36 20 74 6f 20 67 69 76 65 20 74 68 65 |y 16 to give the| 00000990 20 6e 75 6d 62 65 72 20 6f 66 20 74 72 61 63 6b | number of track| 000009a0 73 2e 0d 0d 54 68 65 20 42 41 53 49 43 20 70 72 |s...The BASIC pr| 000009b0 6f 67 72 61 6d 20 74 68 65 6e 20 64 69 76 69 64 |ogram then divid| 000009c0 65 64 20 62 79 20 38 30 20 74 6f 20 67 69 76 65 |ed by 80 to give| 000009d0 20 74 68 65 20 6e 75 6d 62 65 72 20 6f 66 20 73 | the number of s| 000009e0 69 64 65 73 2e 20 20 54 68 69 73 20 69 73 0d 6e |ides. This is.n| 000009f0 6f 74 20 73 6f 20 65 61 73 79 20 74 6f 20 64 6f |ot so easy to do| 00000a00 20 69 6e 20 6d 2f 63 6f 64 65 20 61 6e 64 20 61 | in m/code and a| 00000a10 6c 73 6f 2c 20 68 61 76 69 6e 67 20 61 20 64 69 |lso, having a di| 00000a20 73 63 20 74 68 61 74 20 77 6f 75 6c 64 20 6f 6e |sc that would on| 00000a30 6c 79 20 66 6f 72 6d 61 74 0d 63 6f 6d 70 6c 65 |ly format.comple| 00000a40 74 65 6c 79 20 61 73 20 61 20 34 30 20 74 72 61 |tely as a 40 tra| 00000a50 63 6b 20 64 69 73 63 2c 20 49 20 66 6f 75 6e 64 |ck disc, I found| 00000a60 20 74 68 69 73 20 74 68 65 6e 20 67 61 76 65 20 | this then gave | 00000a70 73 69 64 65 73 20 61 73 20 30 21 21 20 20 49 20 |sides as 0!! I | 00000a80 74 68 65 6e 0d 74 68 6f 75 67 68 74 20 74 68 61 |then.thought tha| 00000a90 74 20 74 72 61 63 6b 73 20 63 61 6e 20 6f 6e 6c |t tracks can onl| 00000aa0 79 1a 20 68 61 76 65 1a 20 74 68 65 1a 20 76 61 |y. have. the. va| 00000ab0 6c 75 65 73 1a 20 31 36 30 2c 20 38 30 20 6f 72 |lues. 160, 80 or| 00000ac0 20 34 30 2e 20 20 53 6f 20 49 20 68 61 76 65 0d | 40. So I have.| 00000ad0 63 6f 6d 70 61 72 65 64 20 74 72 61 63 6b 73 20 |compared tracks | 00000ae0 77 69 74 68 20 31 36 30 20 61 6e 64 20 69 66 20 |with 160 and if | 00000af0 65 71 75 61 6c 20 32 20 69 73 1a 20 70 72 69 6e |equal 2 is. prin| 00000b00 74 65 64 1a 20 61 6e 64 2c 20 69 66 20 6e 6f 74 |ted. and, if not| 00000b10 20 65 71 75 61 6c 2c 20 74 6f 0d 70 72 69 6e 74 | equal, to.print| 00000b20 20 31 20 28 6c 69 6e 65 73 20 31 32 30 30 20 2d | 1 (lines 1200 -| 00000b30 20 31 32 32 30 29 20 2d 20 6d 75 63 68 20 73 69 | 1220) - much si| 00000b40 6d 70 6c 65 72 21 21 0d 0d 54 68 65 20 76 61 6c |mpler!!..The val| 00000b50 75 65 20 6f 66 1a 20 73 65 63 74 6f 72 73 20 69 |ue of. sectors i| 00000b60 73 20 61 6c 73 6f 20 73 74 6f 72 65 64 20 61 74 |s also stored at| 00000b70 20 64 69 73 63 73 69 7a 65 2b 31 20 61 6e 64 20 | discsize+1 and | 00000b80 2b 32 2e 20 20 54 68 69 73 20 67 69 76 65 73 20 |+2. This gives | 00000b90 74 68 65 0d 76 61 6c 75 65 20 6f 66 20 64 69 73 |the.value of dis| 00000ba0 63 73 69 7a 65 20 61 73 20 73 65 63 74 6f 72 73 |csize as sectors| 00000bb0 2a 32 35 36 2c 20 69 65 20 74 68 65 20 6e 75 6d |*256, ie the num| 00000bc0 62 65 72 20 6f 66 20 62 79 74 65 73 20 6f 6e 20 |ber of bytes on | 00000bd0 74 68 65 20 64 69 73 63 2e 0d 0d 4c 69 6e 65 20 |the disc...Line | 00000be0 31 32 35 30 20 73 65 74 73 20 75 70 1a 20 74 68 |1250 sets up. th| 00000bf0 65 1a 20 63 68 61 72 61 63 74 65 72 20 6e 75 6d |e. character num| 00000c00 62 65 72 20 32 32 34 20 75 73 69 6e 67 20 56 44 |ber 224 using VD| 00000c10 55 32 33 2e 20 20 41 20 63 6f 6d 70 61 72 69 73 |U23. A comparis| 00000c20 6f 6e 20 69 73 0d 6d 61 64 65 20 6f 66 20 74 68 |on is.made of th| 00000c30 65 20 76 61 6c 75 65 20 6f 66 20 73 69 64 65 73 |e value of sides| 00000c40 20 61 6e 64 2c 20 69 66 20 65 71 75 61 6c 20 74 | and, if equal t| 00000c50 6f 20 31 20 74 68 65 20 63 68 61 72 61 63 74 65 |o 1 the characte| 00000c60 72 20 62 79 74 65 73 20 61 72 65 20 32 32 34 2c |r bytes are 224,| 00000c70 0d 61 6e 64 20 31 39 32 20 69 66 20 6e 6f 74 2e |.and 192 if not.| 00000c80 20 20 54 68 69 73 20 67 69 76 65 73 20 61 20 6e | This gives a n| 00000c90 61 72 72 6f 77 65 72 20 63 68 61 72 61 63 74 65 |arrower characte| 00000ca0 72 20 66 6f 72 20 61 20 64 6f 75 62 6c 65 20 73 |r for a double s| 00000cb0 69 64 65 64 20 64 69 73 63 2e 0d 0d 54 68 65 20 |ided disc...The | 00000cc0 72 6f 75 74 69 6e 65 20 27 67 72 69 64 27 20 28 |routine 'grid' (| 00000cd0 6c 69 6e 65 73 20 31 33 30 30 20 2d 31 36 39 30 |lines 1300 -1690| 00000ce0 29 1a 20 69 73 1a 20 72 61 74 68 65 72 1a 20 63 |). is. rather. c| 00000cf0 6f 6d 70 6c 65 78 20 62 75 74 20 63 6f 6e 73 69 |omplex but consi| 00000d00 73 74 73 20 6f 66 0d 73 65 76 65 72 61 6c 1a 20 |sts of.several. | 00000d10 73 65 63 74 69 6f 6e 73 2e 20 20 4c 69 6e 65 20 |sections. Line | 00000d20 31 33 31 30 20 75 73 65 73 20 74 68 65 20 64 61 |1310 uses the da| 00000d30 74 61 20 27 64 34 27 20 28 6c 69 6e 65 20 32 38 |ta 'd4' (line 28| 00000d40 34 30 29 2c 20 66 69 72 73 74 20 74 6f 20 73 65 |40), first to se| 00000d50 74 0d 74 68 65 20 62 61 63 6b 67 72 6f 75 6e 64 |t.the background| 00000d60 1a 20 63 6f 6c 6f 75 72 1a 20 74 6f 20 72 65 64 |. colour. to red| 00000d70 20 61 6e 64 20 73 65 74 74 69 6e 67 20 74 68 65 | and setting the| 00000d80 20 67 72 61 70 68 69 63 73 20 77 69 6e 64 6f 77 | graphics window| 00000d90 2e 20 20 41 66 74 65 72 20 74 68 65 0d 77 69 6e |. After the.win| 00000da0 64 6f 77 20 69 73 20 63 6c 65 61 72 65 64 2c 20 |dow is cleared, | 00000db0 74 68 65 1a 20 73 63 72 65 65 6e 1a 20 69 73 20 |the. screen. is | 00000dc0 72 65 74 75 72 6e 65 64 20 6e 6f 72 6d 61 6c 2e |returned normal.| 00000dd0 20 20 54 68 65 20 66 6f 72 65 67 72 6f 75 6e 64 | The foreground| 00000de0 20 63 6f 6c 6f 75 72 0d 69 73 20 74 68 65 6e 20 | colour.is then | 00000df0 73 65 74 20 74 6f 20 77 68 69 74 65 20 61 6e 64 |set to white and| 00000e00 20 74 68 65 20 62 61 63 6b 67 72 6f 75 6e 64 20 | the background | 00000e10 74 6f 20 62 6c 61 63 6b 2e 0d 0d 54 68 65 20 74 |to black...The t| 00000e20 77 6f 20 73 65 63 74 69 6f 6e 73 20 6c 69 6e 65 |wo sections line| 00000e30 73 20 31 33 32 30 20 2d 1a 20 31 34 30 30 1a 20 |s 1320 -. 1400. | 00000e40 61 6e 64 20 31 34 31 30 20 2d 20 31 34 39 30 2c |and 1410 - 1490,| 00000e50 20 70 72 69 6e 74 20 74 68 65 20 67 72 69 64 20 | print the grid | 00000e60 75 73 69 6e 67 0d 74 68 65 20 72 6f 75 74 69 6e |using.the routin| 00000e70 65 20 27 70 6c 6f 74 70 74 27 20 74 6f 20 73 65 |e 'plotpt' to se| 00000e80 74 20 74 68 65 20 70 6c 6f 74 20 70 6f 69 6e 74 |t the plot point| 00000e90 73 2e 0d 0d 54 68 65 20 66 69 72 73 74 20 64 72 |s...The first dr| 00000ea0 61 77 73 20 74 68 65 20 76 65 72 74 69 63 61 6c |aws the vertical| 00000eb0 20 6c 69 6e 65 73 2e 20 20 54 68 65 20 6e 75 6d | lines. The num| 00000ec0 62 65 72 20 6f 66 1a 20 6c 69 6e 65 73 1a 20 74 |ber of. lines. t| 00000ed0 6f 20 62 65 20 64 72 61 77 6e 20 61 72 65 0d 6c |o be drawn are.l| 00000ee0 6f 61 64 65 64 20 69 6e 74 6f 20 27 63 6f 75 6e |oaded into 'coun| 00000ef0 74 27 20 61 6e 64 20 74 68 65 1a 20 66 6f 75 72 |t' and the. four| 00000f00 20 63 6f 2d 6f 72 64 69 6e 61 74 65 20 62 79 74 | co-ordinate byt| 00000f10 65 73 20 6f 66 20 74 68 65 20 76 61 72 69 61 62 |es of the variab| 00000f20 6c 65 20 27 70 6c 6f 74 27 0d 61 72 65 20 73 65 |le 'plot'.are se| 00000f30 74 20 74 6f 20 7a 65 72 6f 20 28 6c 69 6e 65 20 |t to zero (line | 00000f40 31 34 32 30 29 2e 1a 20 20 54 68 65 1a 20 6c 6f |1420).. The. lo| 00000f50 6f 70 1a 20 27 76 6c 70 27 20 74 68 65 6e 20 64 |op. 'vlp' then d| 00000f60 72 61 77 73 20 74 68 65 20 6c 69 6e 65 73 2e 20 |raws the lines. | 00000f70 20 54 68 65 0d 74 77 6f 20 63 61 6c 6c 73 20 74 | The.two calls t| 00000f80 6f 20 74 68 65 20 72 6f 75 74 69 6e 65 20 22 70 |o the routine "p| 00000f90 6c 6f 74 70 74 27 20 63 68 61 6e 67 65 20 74 68 |lotpt' change th| 00000fa0 65 20 59 1a 20 63 6f 2d 6f 72 64 73 1a 20 74 6f |e Y. co-ords. to| 00000fb0 20 64 72 61 77 20 61 20 6c 69 6e 65 20 6f 6e 0d | draw a line on.| 00000fc0 74 68 65 1a 20 58 1a 20 63 6f 2d 6f 72 64 20 28 |the. X. co-ord (| 00000fd0 69 6e 69 74 69 61 6c 6c 79 20 7a 65 72 6f 29 2e |initially zero).| 00000fe0 20 20 54 68 65 20 58 20 63 6f 2d 6f 72 64 20 69 | The X co-ord i| 00000ff0 73 20 69 6e 63 72 65 61 73 65 64 20 62 79 1a 20 |s increased by. | 00001000 61 64 64 69 6e 67 1a 20 31 36 0d 65 61 63 68 20 |adding. 16.each | 00001010 74 69 6d 65 20 72 6f 75 6e 64 20 74 68 65 20 6c |time round the l| 00001020 6f 6f 70 20 61 6e 64 20 27 63 6f 75 6e 74 27 20 |oop and 'count' | 00001030 64 65 63 72 65 61 73 65 64 20 75 6e 74 69 6c 20 |decreased until | 00001040 74 68 69 73 20 69 73 20 7a 65 72 6f 20 61 6e 64 |this is zero and| 00001050 20 74 68 65 6e 0d 74 68 65 20 73 65 63 6f 6e 64 | then.the second| 00001060 20 73 65 63 74 69 6f 6e 20 64 72 61 77 73 20 74 | section draws t| 00001070 68 65 20 68 6f 72 69 7a 6f 6e 74 61 6c 20 6c 69 |he horizontal li| 00001080 6e 65 73 20 69 6e 20 74 68 65 20 73 61 6d 65 20 |nes in the same | 00001090 77 61 79 2e 0d 0d 54 68 65 20 74 68 69 72 64 20 |way...The third | 000010a0 73 65 63 74 69 6f 6e 20 28 6c 69 6e 65 73 20 31 |section (lines 1| 000010b0 35 30 30 1a 20 2d 1a 20 31 36 39 30 29 20 70 72 |500. -. 1690) pr| 000010c0 69 6e 74 73 20 74 68 65 20 74 72 61 63 6b 20 6e |ints the track n| 000010d0 75 6d 62 65 72 73 20 61 6e 64 20 73 68 6f 72 74 |umbers and short| 000010e0 0d 76 65 72 74 69 63 61 6c 20 6c 69 6e 65 73 20 |.vertical lines | 000010f0 75 6e 64 65 72 6e 65 61 74 68 2e 20 20 4c 69 6e |underneath. Lin| 00001100 65 20 31 35 31 30 20 73 65 74 73 20 63 6f 75 6e |e 1510 sets coun| 00001110 74 20 74 6f 1a 20 38 2c 1a 20 74 68 65 20 58 20 |t to. 8,. the X | 00001120 63 6f 2d 6f 72 64 2c 20 68 65 78 0d 61 6e 64 20 |co-ord, hex.and | 00001130 74 72 6b 6e 6f 20 74 6f 20 7a 65 72 6f 2e 20 20 |trkno to zero. | 00001140 0d 0d 54 68 65 1a 20 6e 75 6d 62 65 72 1a 20 6f |..The. number. o| 00001150 66 20 73 69 64 65 73 20 69 73 20 74 68 65 6e 20 |f sides is then | 00001160 63 68 65 63 6b 65 64 2c 20 69 66 20 74 68 69 73 |checked, if this| 00001170 20 69 73 20 74 77 6f 2c 20 74 68 65 20 76 61 72 | is two, the var| 00001180 69 61 62 6c 65 20 27 64 69 66 66 27 0d 69 73 20 |iable 'diff'.is | 00001190 65 71 75 61 6c 20 74 6f 1a 20 32 30 20 6f 74 68 |equal to. 20 oth| 000011a0 65 72 77 69 73 65 20 69 74 20 65 71 75 61 6c 20 |erwise it equal | 000011b0 74 6f 20 31 30 2e 20 20 54 68 65 20 6c 6f 6f 70 |to 10. The loop| 000011c0 20 27 76 6c 70 32 27 20 66 69 72 73 74 20 64 72 | 'vlp2' first dr| 000011d0 61 77 73 20 74 68 65 0d 73 68 6f 72 74 20 6c 69 |aws the.short li| 000011e0 6e 65 20 75 73 69 6e 67 20 27 70 6c 6f 74 70 74 |ne using 'plotpt| 000011f0 27 20 74 68 65 6e 20 74 68 65 20 76 61 6c 75 65 |' then the value| 00001200 20 69 6e 20 74 72 6b 6e 6f 20 69 73 20 63 6f 6d | in trkno is com| 00001210 70 61 72 65 64 20 61 6e 64 20 69 66 20 65 71 75 |pared and if equ| 00001220 61 6c 0d 74 6f 20 7a 65 72 6f 2c 20 61 20 7a 65 |al.to zero, a ze| 00001230 72 6f 20 69 73 1a 20 70 72 69 6e 74 65 64 1a 20 |ro is. printed. | 00001240 28 6c 69 6e 65 73 1a 20 31 35 37 30 20 2d 20 31 |(lines. 1570 - 1| 00001250 35 39 30 29 2e 20 20 54 68 65 20 76 61 6c 75 65 |590). The value| 00001260 20 6f 66 20 27 64 69 66 66 27 20 69 73 0d 61 64 | of 'diff' is.ad| 00001270 64 65 64 20 61 6e 64 20 31 39 32 20 61 64 64 65 |ded and 192 adde| 00001280 64 20 74 6f 20 74 68 65 20 58 20 63 6f 2d 6f 72 |d to the X co-or| 00001290 64 1a 20 62 65 66 6f 72 65 20 6c 6f 6f 70 69 6e |d. before loopin| 000012a0 67 20 62 61 63 6b 20 74 6f 20 27 76 6c 70 32 27 |g back to 'vlp2'| 000012b0 2e 20 20 53 69 6e 63 65 0d 74 72 6b 6e 6f 20 69 |. Since.trkno i| 000012c0 73 20 6e 6f 74 20 7a 65 72 6f 2c 20 74 68 65 20 |s not zero, the | 000012d0 74 72 61 63 6b 20 6e 75 6d 62 65 72 73 20 61 72 |track numbers ar| 000012e0 65 20 6e 6f 77 1a 20 70 72 69 6e 74 65 64 1a 20 |e now. printed. | 000012f0 75 73 69 6e 67 1a 20 74 68 65 1a 20 72 6f 75 74 |using. the. rout| 00001300 69 6e 65 0d 27 64 65 63 70 72 74 27 1a 20 28 6c |ine.'decprt'. (l| 00001310 69 6e 65 73 1a 20 36 35 30 20 2d 20 31 30 39 30 |ines. 650 - 1090| 00001320 29 2e 20 20 54 68 69 73 20 72 6f 75 74 69 6e 65 |). This routine| 00001330 20 66 6f 72 20 70 72 69 6e 74 69 6e 67 20 61 20 | for printing a | 00001340 64 65 63 69 6d 61 6c 20 6e 75 6d 62 65 72 0d 77 |decimal number.w| 00001350 61 73 20 20 61 20 72 6f 75 74 69 6e 65 20 67 69 |as a routine gi| 00001360 76 65 6e 20 69 6e 20 74 68 65 20 4d 69 63 72 6f |ven in the Micro| 00001370 20 55 73 65 72 20 53 65 70 20 31 39 39 30 2e 20 | User Sep 1990. | 00001380 20 54 68 69 73 20 69 73 20 75 73 65 64 20 63 6f | This is used co| 00001390 6d 70 6c 65 74 65 20 61 73 0d 49 1a 20 64 6f 1a |mplete as.I. do.| 000013a0 20 6e 6f 74 1a 20 6b 6e 6f 77 1a 20 61 6e 6f 74 | not. know. anot| 000013b0 68 65 72 20 72 6f 75 74 69 6e 65 20 74 6f 20 64 |her routine to d| 000013c0 6f 20 74 68 69 73 2e 20 20 54 68 65 20 63 6f 6d |o this. The com| 000013d0 70 61 72 69 73 6f 6e 20 69 6e 20 6c 69 6e 65 20 |parison in line | 000013e0 31 36 34 30 0d 73 74 6f 70 73 20 74 68 65 20 70 |1640.stops the p| 000013f0 72 69 6e 74 69 6e 67 20 6f 66 20 74 68 65 20 66 |rinting of the f| 00001400 69 6e 61 6c 20 74 72 61 63 6b 20 6e 75 6d 62 65 |inal track numbe| 00001410 72 20 61 6e 64 20 65 6e 64 73 20 74 68 65 20 72 |r and ends the r| 00001420 6f 75 74 69 6e 65 2e 0d 0d 54 68 65 20 72 6f 75 |outine...The rou| 00001430 74 69 6e 65 20 27 69 6e 66 6f 27 20 70 72 69 6e |tine 'info' prin| 00001440 74 73 20 74 68 65 20 74 72 61 63 6b 73 20 68 65 |ts the tracks he| 00001450 61 64 69 6e 67 20 61 6e 64 20 74 68 65 20 72 65 |ading and the re| 00001460 6d 61 69 6e 69 6e 67 20 70 72 69 6e 74 69 6e 67 |maining printing| 00001470 20 61 73 0d 62 65 66 6f 72 65 20 75 73 69 6e 67 | as.before using| 00001480 20 64 61 74 61 20 6c 69 6e 65 73 20 32 38 35 30 | data lines 2850| 00001490 1a 20 26 20 32 38 36 30 20 61 6e 64 20 74 68 65 |. & 2860 and the| 000014a0 20 27 64 65 63 70 72 74 27 20 72 6f 75 74 69 6e | 'decprt' routin| 000014b0 65 20 66 6f 72 20 70 72 69 6e 74 69 6e 67 0d 74 |e for printing.t| 000014c0 68 65 20 76 61 6c 75 65 73 2e 20 20 20 20 20 20 |he values. | 000014d0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00001500 20 20 20 20 20 20 20 20 20 0d 0d 54 68 65 20 72 | ..The r| 00001510 6f 75 74 69 6e 65 20 27 6b 65 79 27 20 70 72 69 |outine 'key' pri| 00001520 6e 74 73 20 74 68 65 20 6b 65 79 20 74 6f 20 74 |nts the key to t| 00001530 68 65 20 63 6f 6c 6f 75 72 73 2e 1a 20 20 46 6f |he colours.. Fo| 00001540 72 20 65 61 63 68 1a 20 6f 66 1a 20 74 68 65 1a |r each. of. the.| 00001550 20 66 6f 75 72 0d 63 6f 6c 6f 75 72 73 2c 20 74 | four.colours, t| 00001560 68 65 20 63 6f 2d 6f 72 64 73 20 58 20 61 6e 64 |he co-ords X and| 00001570 1a 20 59 20 61 6e 64 20 74 68 65 20 74 77 6f 20 |. Y and the two | 00001580 63 6f 6c 6f 75 72 20 6e 75 6d 62 65 72 73 20 43 |colour numbers C| 00001590 31 20 61 6e 64 20 43 32 20 61 72 65 20 73 65 74 |1 and C2 are set| 000015a0 0d 62 65 66 6f 72 65 1a 20 74 68 65 1a 20 72 6f |.before. the. ro| 000015b0 75 74 69 6e 65 20 27 73 71 72 27 20 69 73 20 63 |utine 'sqr' is c| 000015c0 61 6c 6c 65 64 2e 20 20 54 68 69 73 20 73 65 74 |alled. This set| 000015d0 73 20 74 68 65 20 63 6f 6c 6f 75 72 20 43 31 20 |s the colour C1 | 000015e0 66 6f 72 20 6b 65 79 20 61 6e 64 0d 64 72 61 77 |for key and.draw| 000015f0 73 20 61 20 73 6f 6c 69 64 20 73 71 75 61 72 65 |s a solid square| 00001600 20 62 79 1a 20 75 73 69 6e 67 1a 20 50 4c 4f 54 | by. using. PLOT| 00001610 20 63 6f 64 65 20 38 35 20 74 77 69 63 65 2e 20 | code 85 twice. | 00001620 20 54 68 65 20 63 6f 6c 6f 75 72 20 69 73 20 63 | The colour is c| 00001630 68 61 6e 67 65 64 0d 74 6f 1a 20 43 32 20 61 6e |hanged.to. C2 an| 00001640 64 20 74 68 65 20 6f 75 74 6c 69 6e 65 20 64 72 |d the outline dr| 00001650 61 77 6e 2e 20 20 54 68 65 1a 20 70 72 6f 67 72 |awn. The. progr| 00001660 61 6d 1a 20 72 65 74 75 72 6e 73 1a 20 74 6f 1a |am. returns. to.| 00001670 20 27 69 6e 66 6f 27 1a 20 66 6f 72 1a 20 74 68 | 'info'. for. th| 00001680 65 0d 70 72 69 6e 74 69 6e 67 2e 0d 0d |e.printing...| 0000168d
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