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F/+HINT12
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_28.ADF |
| Filename: | F/+HINT12 |
| Read OK: | ✔ |
| File size: | 14C6 bytes |
| Load address: | 48204556 |
| Exec address: | 38544E49 |
File contents
XOSBGE
XOSBGE is equivalent to OSBGET, except that ViewStore error handling is
enabled.
On entry: See filing system manual for OSBGET.
On exit: VS error occurred; error code in A.
VC no error; see filing system manual for
results.
XOSBPU
XOSBPU is equivalent to OSBPUT, except that ViewStore error handling is
enabled.
On entry: see filing system manual for OSBPUT.
On exit: VS error occurred; error code in A.
VC no error; see filing system manual for
results.
XOSCLS
XOSCLS is equivalent to OSFIND with A=0, in order to close a file.
ViewStore error trapping is also enabled.
On entry: Y contains handle of file to be closed.
On exit: VS error occurred; error code in A.
VC file closed successfully.
X,Y undefined.
XOSGBP
XOSGBP is equivalent to OSGBPB, except that ViewStore error handling is
enabled.
On entry: See filing system manual for OSGBPB.
On exit: VS error occurred; error code in A.
VC no error; see filing system manual for
results.
CALUTI
CALUTI is provided to allow utilities to call other programs stored in
utility file format. The SELECT utility, which is provided with ViewStore,
uses this call to call the SORT program when it is required. Parameters can
be passed between the programs using temporaries, or other memory space.
The CALUTI call can be thought of as the logical equivalent of the Basic
CHAIN statement. The utility should exit under the prefix given for
utilities; CALUTI applies the utility prefix to the name given
automatically. If the utility is not found, the "Insert utility disc and
hit a key" message will be generated, and ViewStore will wait until a key is
pressed before continuing.
On entry: A contains low byte of address of name of
utility to be loaded. Name must be
terminated by Carriage Return.
Y contains high byte of address of name of
utility to be loaded.
TEMP14 contains the address of the first byte of
free memory that the utility being loaded is
to use. This will normally be the same
value as passed to the initial utility.
On exit: VS error occurred; error code in A. Otherwise,
control is passed to the new utility.
Floating Point
Unfortunately, a discussion of floating point is outside the scope of this
document. However, certain of the key routines in a floating point package
are in the ROM itself, and entry points to these routines are provided.
The REPORT utility which is provided with ViewStore uses these routines, and
implements many more inside itself. The routine most obviously missing from
this set is a routine to output a floating point number in ASCII. If you
wish to do this, you will have to work out how to do it yourself.
I can refer you to the "Advanced Basic Rom User Guide", published by the
"Cambridge Microcomputer Centre", which contains useful information about
the floating point package in Basic, and how it works. The floating point
in ViewStore works in the same way.
Remember that there is no need to understand floating point to write a
utility, since the date in ViewStore files is stored in ASCII format, not as
floating point numbers. Use of floating is only necessary when you wish
your utility to provide floating point arithmetic.
The two accumulators, FWRK and FACC are in zero page. If you are not using
the floating point package in your utility, you can use the zero page
allocated to the accumulators for your own purposes.
FONE Sets FACC to value of one.
FTENFX Multiplies FACC by 10 (not normalised).
FTENGQ Divides FACC by 10 (not normalised).
FADDWI Adds FACC and FWRK; answer in FACC, not rounded.
FTENX Multiplies mantissa by 10.
FRDDK Reads in ASCII number to FACC. Low byte of address of
string in A; high byte of address of string in Y.
FTST Tests number of FACC and sets flags.
FNEG Swaps sign of number in FACC.
FCLR Sets FACC to zero.
FADDW Adds FACC and FWRK; answer in FACC, rounded.
FDIVA Divides FACC by FWRK; answer in FACC.
FMULX Multiples FACC by FWRK; answer in FACC.
General
These routines are an assortment of useful subroutines for which entry
points are provided.
GETDEC Get a decimal number.
KINCH Flush keyboard buffer, and get an input character.
MULPLY Multiply two single byte integers.
OUTDEC Output a decimal number.
PSTRNG Output a string.
RELLIN Read a line of input.
SKPCBL Skip blanks.
00000000 58 4f 53 42 47 45 0d 0d 58 4f 53 42 47 45 20 69 |XOSBGE..XOSBGE i| 00000010 73 20 65 71 75 69 76 61 6c 65 6e 74 20 74 6f 20 |s equivalent to | 00000020 4f 53 42 47 45 54 2c 20 65 78 63 65 70 74 20 74 |OSBGET, except t| 00000030 68 61 74 20 56 69 65 77 53 74 6f 72 65 20 65 72 |hat ViewStore er| 00000040 72 6f 72 20 68 61 6e 64 6c 69 6e 67 20 69 73 0d |ror handling is.| 00000050 65 6e 61 62 6c 65 64 2e 0d 0d 4f 6e 20 65 6e 74 |enabled...On ent| 00000060 72 79 3a 20 20 20 20 20 20 20 20 20 20 20 20 20 |ry: | 00000070 20 20 20 20 20 20 20 20 20 20 53 65 65 20 66 69 | See fi| 00000080 6c 69 6e 67 20 73 79 73 74 65 6d 20 6d 61 6e 75 |ling system manu| 00000090 61 6c 20 66 6f 72 20 4f 53 42 47 45 54 2e 0d 0d |al for OSBGET...| 000000a0 4f 6e 20 65 78 69 74 3a 20 20 20 20 20 20 20 20 |On exit: | 000000b0 56 53 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |VS | 000000c0 65 72 72 6f 72 20 6f 63 63 75 72 72 65 64 3b 20 |error occurred; | 000000d0 65 72 72 6f 72 20 63 6f 64 65 20 69 6e 20 41 2e |error code in A.| 000000e0 0d 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |. | 000000f0 20 56 43 20 20 20 20 20 20 20 20 20 20 20 20 20 | VC | 00000100 20 6e 6f 20 65 72 72 6f 72 3b 20 73 65 65 20 66 | no error; see f| 00000110 69 6c 69 6e 67 20 73 79 73 74 65 6d 20 6d 61 6e |iling system man| 00000120 75 61 6c 20 66 6f 72 0d 20 20 20 20 20 20 20 20 |ual for. | 00000130 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000140 20 20 20 20 20 20 20 20 72 65 73 75 6c 74 73 2e | results.| 00000150 0d 0d 0d 58 4f 53 42 50 55 0d 0d 58 4f 53 42 50 |...XOSBPU..XOSBP| 00000160 55 20 69 73 20 65 71 75 69 76 61 6c 65 6e 74 20 |U is equivalent | 00000170 74 6f 20 4f 53 42 50 55 54 2c 20 65 78 63 65 70 |to OSBPUT, excep| 00000180 74 20 74 68 61 74 20 56 69 65 77 53 74 6f 72 65 |t that ViewStore| 00000190 20 65 72 72 6f 72 20 68 61 6e 64 6c 69 6e 67 20 | error handling | 000001a0 69 73 0d 65 6e 61 62 6c 65 64 2e 0d 0d 4f 6e 20 |is.enabled...On | 000001b0 65 6e 74 72 79 3a 20 20 20 20 20 20 20 20 20 20 |entry: | 000001c0 20 20 20 20 20 20 20 20 20 20 20 20 20 73 65 65 | see| 000001d0 20 66 69 6c 69 6e 67 20 73 79 73 74 65 6d 20 6d | filing system m| 000001e0 61 6e 75 61 6c 20 66 6f 72 20 4f 53 42 50 55 54 |anual for OSBPUT| 000001f0 2e 0d 0d 4f 6e 20 65 78 69 74 3a 20 20 20 20 20 |...On exit: | 00000200 20 20 20 56 53 20 20 20 20 20 20 20 20 20 20 20 | VS | 00000210 20 20 20 65 72 72 6f 72 20 6f 63 63 75 72 72 65 | error occurre| 00000220 64 3b 20 65 72 72 6f 72 20 63 6f 64 65 20 69 6e |d; error code in| 00000230 20 41 2e 0d 20 20 20 20 20 20 20 20 20 20 20 20 | A.. | 00000240 20 20 20 20 56 43 20 20 20 20 20 20 20 20 20 20 | VC | 00000250 20 20 20 20 6e 6f 20 65 72 72 6f 72 3b 20 73 65 | no error; se| 00000260 65 20 66 69 6c 69 6e 67 20 73 79 73 74 65 6d 20 |e filing system | 00000270 6d 61 6e 75 61 6c 20 66 6f 72 0d 20 20 20 20 20 |manual for. | 00000280 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000290 20 20 20 20 20 20 20 20 20 20 20 72 65 73 75 6c | resul| 000002a0 74 73 2e 0d 0d 0d 58 4f 53 43 4c 53 0d 0d 58 4f |ts....XOSCLS..XO| 000002b0 53 43 4c 53 20 69 73 20 65 71 75 69 76 61 6c 65 |SCLS is equivale| 000002c0 6e 74 20 74 6f 20 4f 53 46 49 4e 44 20 77 69 74 |nt to OSFIND wit| 000002d0 68 20 41 3d 30 2c 20 69 6e 20 6f 72 64 65 72 20 |h A=0, in order | 000002e0 74 6f 20 63 6c 6f 73 65 20 61 20 66 69 6c 65 2e |to close a file.| 000002f0 20 0d 56 69 65 77 53 74 6f 72 65 20 65 72 72 6f | .ViewStore erro| 00000300 72 20 74 72 61 70 70 69 6e 67 20 69 73 20 61 6c |r trapping is al| 00000310 73 6f 20 65 6e 61 62 6c 65 64 2e 0d 0d 4f 6e 20 |so enabled...On | 00000320 65 6e 74 72 79 3a 20 20 20 20 20 20 20 59 20 20 |entry: Y | 00000330 20 20 20 20 20 63 6f 6e 74 61 69 6e 73 20 68 61 | contains ha| 00000340 6e 64 6c 65 20 6f 66 20 66 69 6c 65 20 74 6f 20 |ndle of file to | 00000350 62 65 20 63 6c 6f 73 65 64 2e 0d 0d 4f 6e 20 65 |be closed...On e| 00000360 78 69 74 3a 20 20 20 20 20 20 20 20 56 53 20 20 |xit: VS | 00000370 20 20 20 20 65 72 72 6f 72 20 6f 63 63 75 72 72 | error occurr| 00000380 65 64 3b 20 65 72 72 6f 72 20 63 6f 64 65 20 69 |ed; error code i| 00000390 6e 20 41 2e 0d 20 20 20 20 20 20 20 20 20 20 20 |n A.. | 000003a0 20 20 20 20 20 56 43 20 20 20 20 20 20 66 69 6c | VC fil| 000003b0 65 20 63 6c 6f 73 65 64 20 73 75 63 63 65 73 73 |e closed success| 000003c0 66 75 6c 6c 79 2e 0d 20 20 20 20 20 20 20 20 20 |fully.. | 000003d0 20 20 20 20 20 20 20 58 2c 59 20 20 20 20 20 75 | X,Y u| 000003e0 6e 64 65 66 69 6e 65 64 2e 0d 0d 0d 58 4f 53 47 |ndefined....XOSG| 000003f0 42 50 0d 0d 58 4f 53 47 42 50 20 69 73 20 65 71 |BP..XOSGBP is eq| 00000400 75 69 76 61 6c 65 6e 74 20 74 6f 20 4f 53 47 42 |uivalent to OSGB| 00000410 50 42 2c 20 65 78 63 65 70 74 20 74 68 61 74 20 |PB, except that | 00000420 56 69 65 77 53 74 6f 72 65 20 65 72 72 6f 72 20 |ViewStore error | 00000430 68 61 6e 64 6c 69 6e 67 20 69 73 0d 65 6e 61 62 |handling is.enab| 00000440 6c 65 64 2e 0d 0d 4f 6e 20 65 6e 74 72 79 3a 20 |led...On entry: | 00000450 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000460 20 20 20 20 20 20 53 65 65 20 66 69 6c 69 6e 67 | See filing| 00000470 20 73 79 73 74 65 6d 20 6d 61 6e 75 61 6c 20 66 | system manual f| 00000480 6f 72 20 4f 53 47 42 50 42 2e 0d 0d 4f 6e 20 65 |or OSGBPB...On e| 00000490 78 69 74 3a 20 20 20 20 20 20 20 20 56 53 20 20 |xit: VS | 000004a0 20 20 20 20 20 20 20 20 20 20 20 20 65 72 72 6f | erro| 000004b0 72 20 6f 63 63 75 72 72 65 64 3b 20 65 72 72 6f |r occurred; erro| 000004c0 72 20 63 6f 64 65 20 69 6e 20 41 2e 20 0d 20 20 |r code in A. . | 000004d0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 56 43 | VC| 000004e0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 6e 6f | no| 000004f0 20 65 72 72 6f 72 3b 20 73 65 65 20 66 69 6c 69 | error; see fili| 00000500 6e 67 20 73 79 73 74 65 6d 20 6d 61 6e 75 61 6c |ng system manual| 00000510 20 66 6f 72 20 0d 20 20 20 20 20 20 20 20 20 20 | for . | 00000520 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000530 20 20 20 20 20 20 72 65 73 75 6c 74 73 2e 20 20 | results. | 00000540 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000550 20 20 20 20 20 20 20 20 20 20 20 20 20 20 0d 0d | ..| 00000560 0d 43 41 4c 55 54 49 0d 0d 43 41 4c 55 54 49 20 |.CALUTI..CALUTI | 00000570 69 73 20 70 72 6f 76 69 64 65 64 20 74 6f 20 61 |is provided to a| 00000580 6c 6c 6f 77 20 75 74 69 6c 69 74 69 65 73 20 74 |llow utilities t| 00000590 6f 20 63 61 6c 6c 20 6f 74 68 65 72 20 70 72 6f |o call other pro| 000005a0 67 72 61 6d 73 20 73 74 6f 72 65 64 20 69 6e 0d |grams stored in.| 000005b0 75 74 69 6c 69 74 79 20 66 69 6c 65 20 66 6f 72 |utility file for| 000005c0 6d 61 74 2e 20 20 54 68 65 20 53 45 4c 45 43 54 |mat. The SELECT| 000005d0 20 75 74 69 6c 69 74 79 2c 20 77 68 69 63 68 20 | utility, which | 000005e0 69 73 20 70 72 6f 76 69 64 65 64 20 77 69 74 68 |is provided with| 000005f0 20 56 69 65 77 53 74 6f 72 65 2c 0d 75 73 65 73 | ViewStore,.uses| 00000600 20 74 68 69 73 20 63 61 6c 6c 20 74 6f 20 63 61 | this call to ca| 00000610 6c 6c 20 74 68 65 20 53 4f 52 54 20 70 72 6f 67 |ll the SORT prog| 00000620 72 61 6d 20 77 68 65 6e 20 69 74 20 69 73 20 72 |ram when it is r| 00000630 65 71 75 69 72 65 64 2e 20 20 50 61 72 61 6d 65 |equired. Parame| 00000640 74 65 72 73 20 63 61 6e 0d 62 65 20 70 61 73 73 |ters can.be pass| 00000650 65 64 20 62 65 74 77 65 65 6e 20 74 68 65 20 70 |ed between the p| 00000660 72 6f 67 72 61 6d 73 20 75 73 69 6e 67 20 74 65 |rograms using te| 00000670 6d 70 6f 72 61 72 69 65 73 2c 20 6f 72 20 6f 74 |mporaries, or ot| 00000680 68 65 72 20 6d 65 6d 6f 72 79 20 73 70 61 63 65 |her memory space| 00000690 2e 20 0d 54 68 65 20 43 41 4c 55 54 49 20 63 61 |. .The CALUTI ca| 000006a0 6c 6c 20 63 61 6e 20 62 65 20 74 68 6f 75 67 68 |ll can be though| 000006b0 74 20 6f 66 20 61 73 20 74 68 65 20 6c 6f 67 69 |t of as the logi| 000006c0 63 61 6c 20 65 71 75 69 76 61 6c 65 6e 74 20 6f |cal equivalent o| 000006d0 66 20 74 68 65 20 42 61 73 69 63 0d 43 48 41 49 |f the Basic.CHAI| 000006e0 4e 20 73 74 61 74 65 6d 65 6e 74 2e 20 54 68 65 |N statement. The| 000006f0 20 75 74 69 6c 69 74 79 20 73 68 6f 75 6c 64 20 | utility should | 00000700 65 78 69 74 20 75 6e 64 65 72 20 74 68 65 20 70 |exit under the p| 00000710 72 65 66 69 78 20 67 69 76 65 6e 20 66 6f 72 0d |refix given for.| 00000720 75 74 69 6c 69 74 69 65 73 3b 20 43 41 4c 55 54 |utilities; CALUT| 00000730 49 20 61 70 70 6c 69 65 73 20 74 68 65 20 75 74 |I applies the ut| 00000740 69 6c 69 74 79 20 70 72 65 66 69 78 20 74 6f 20 |ility prefix to | 00000750 74 68 65 20 6e 61 6d 65 20 67 69 76 65 6e 0d 61 |the name given.a| 00000760 75 74 6f 6d 61 74 69 63 61 6c 6c 79 2e 20 20 49 |utomatically. I| 00000770 66 20 74 68 65 20 75 74 69 6c 69 74 79 20 69 73 |f the utility is| 00000780 20 6e 6f 74 20 66 6f 75 6e 64 2c 20 74 68 65 20 | not found, the | 00000790 22 49 6e 73 65 72 74 20 75 74 69 6c 69 74 79 20 |"Insert utility | 000007a0 64 69 73 63 20 61 6e 64 0d 68 69 74 20 61 20 6b |disc and.hit a k| 000007b0 65 79 22 20 6d 65 73 73 61 67 65 20 77 69 6c 6c |ey" message will| 000007c0 20 62 65 20 67 65 6e 65 72 61 74 65 64 2c 20 61 | be generated, a| 000007d0 6e 64 20 56 69 65 77 53 74 6f 72 65 20 77 69 6c |nd ViewStore wil| 000007e0 6c 20 77 61 69 74 20 75 6e 74 69 6c 20 61 20 6b |l wait until a k| 000007f0 65 79 20 69 73 0d 70 72 65 73 73 65 64 20 62 65 |ey is.pressed be| 00000800 66 6f 72 65 20 63 6f 6e 74 69 6e 75 69 6e 67 2e |fore continuing.| 00000810 0d 0d 4f 6e 20 65 6e 74 72 79 3a 20 20 20 20 20 |..On entry: | 00000820 20 20 41 20 20 20 20 20 20 20 20 20 20 20 20 20 | A | 00000830 20 20 63 6f 6e 74 61 69 6e 73 20 6c 6f 77 20 62 | contains low b| 00000840 79 74 65 20 6f 66 20 61 64 64 72 65 73 73 20 6f |yte of address o| 00000850 66 20 6e 61 6d 65 20 6f 66 20 0d 20 20 20 20 20 |f name of . | 00000860 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000870 20 20 20 20 20 20 20 20 20 20 20 75 74 69 6c 69 | utili| 00000880 74 79 20 74 6f 20 62 65 20 6c 6f 61 64 65 64 2e |ty to be loaded.| 00000890 20 20 4e 61 6d 65 20 6d 75 73 74 20 62 65 0d 20 | Name must be. | 000008a0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000008b0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 74 | t| 000008c0 65 72 6d 69 6e 61 74 65 64 20 62 79 20 43 61 72 |erminated by Car| 000008d0 72 69 61 67 65 20 52 65 74 75 72 6e 2e 0d 20 20 |riage Return.. | 000008e0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 59 20 | Y | 000008f0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 63 6f | co| 00000900 6e 74 61 69 6e 73 20 68 69 67 68 20 62 79 74 65 |ntains high byte| 00000910 20 6f 66 20 61 64 64 72 65 73 73 20 6f 66 20 6e | of address of n| 00000920 61 6d 65 20 6f 66 20 0d 20 20 20 20 20 20 20 20 |ame of . | 00000930 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000940 20 20 20 20 20 20 20 20 75 74 69 6c 69 74 79 20 | utility | 00000950 74 6f 20 62 65 20 6c 6f 61 64 65 64 2e 0d 20 20 |to be loaded.. | 00000960 20 20 20 20 20 20 20 20 20 20 20 20 20 20 54 45 | TE| 00000970 4d 50 31 34 20 20 20 20 20 20 20 20 20 20 63 6f |MP14 co| 00000980 6e 74 61 69 6e 73 20 74 68 65 20 61 64 64 72 65 |ntains the addre| 00000990 73 73 20 6f 66 20 74 68 65 20 66 69 72 73 74 20 |ss of the first | 000009a0 62 79 74 65 20 6f 66 0d 20 20 20 20 20 20 20 20 |byte of. | 000009b0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000009c0 20 20 20 20 20 20 20 20 66 72 65 65 20 6d 65 6d | free mem| 000009d0 6f 72 79 20 74 68 61 74 20 74 68 65 20 75 74 69 |ory that the uti| 000009e0 6c 69 74 79 20 62 65 69 6e 67 20 6c 6f 61 64 65 |lity being loade| 000009f0 64 20 69 73 0d 20 20 20 20 20 20 20 20 20 20 20 |d is. | 00000a00 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000a10 20 20 20 20 20 74 6f 20 75 73 65 2e 20 20 54 68 | to use. Th| 00000a20 69 73 20 77 69 6c 6c 20 6e 6f 72 6d 61 6c 6c 79 |is will normally| 00000a30 20 62 65 20 74 68 65 20 73 61 6d 65 0d 20 20 20 | be the same. | 00000a40 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000a50 20 20 20 20 20 20 20 20 20 20 20 20 20 76 61 6c | val| 00000a60 75 65 20 61 73 20 70 61 73 73 65 64 20 74 6f 20 |ue as passed to | 00000a70 74 68 65 20 69 6e 69 74 69 61 6c 20 75 74 69 6c |the initial util| 00000a80 69 74 79 2e 0d 0d 4f 6e 20 65 78 69 74 3a 20 20 |ity...On exit: | 00000a90 20 20 20 20 20 20 56 53 20 20 20 20 20 20 20 20 | VS | 00000aa0 20 20 20 20 20 20 65 72 72 6f 72 20 6f 63 63 75 | error occu| 00000ab0 72 72 65 64 3b 20 65 72 72 6f 72 20 63 6f 64 65 |rred; error code| 00000ac0 20 69 6e 20 41 2e 20 20 4f 74 68 65 72 77 69 73 | in A. Otherwis| 00000ad0 65 2c 20 0d 20 20 20 20 20 20 20 20 20 20 20 20 |e, . | 00000ae0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000af0 20 20 20 20 63 6f 6e 74 72 6f 6c 20 69 73 20 70 | control is p| 00000b00 61 73 73 65 64 20 74 6f 20 74 68 65 20 6e 65 77 |assed to the new| 00000b10 20 75 74 69 6c 69 74 79 2e 0d 0d 0d 46 6c 6f 61 | utility....Floa| 00000b20 74 69 6e 67 20 50 6f 69 6e 74 0d 0d 55 6e 66 6f |ting Point..Unfo| 00000b30 72 74 75 6e 61 74 65 6c 79 2c 20 61 20 64 69 73 |rtunately, a dis| 00000b40 63 75 73 73 69 6f 6e 20 6f 66 20 66 6c 6f 61 74 |cussion of float| 00000b50 69 6e 67 20 70 6f 69 6e 74 20 69 73 20 6f 75 74 |ing point is out| 00000b60 73 69 64 65 20 74 68 65 20 73 63 6f 70 65 20 6f |side the scope o| 00000b70 66 20 74 68 69 73 0d 64 6f 63 75 6d 65 6e 74 2e |f this.document.| 00000b80 20 20 48 6f 77 65 76 65 72 2c 20 63 65 72 74 61 | However, certa| 00000b90 69 6e 20 6f 66 20 74 68 65 20 6b 65 79 20 72 6f |in of the key ro| 00000ba0 75 74 69 6e 65 73 20 69 6e 20 61 20 66 6c 6f 61 |utines in a floa| 00000bb0 74 69 6e 67 20 70 6f 69 6e 74 20 70 61 63 6b 61 |ting point packa| 00000bc0 67 65 0d 61 72 65 20 69 6e 20 74 68 65 20 52 4f |ge.are in the RO| 00000bd0 4d 20 69 74 73 65 6c 66 2c 20 61 6e 64 20 65 6e |M itself, and en| 00000be0 74 72 79 20 70 6f 69 6e 74 73 20 74 6f 20 74 68 |try points to th| 00000bf0 65 73 65 20 72 6f 75 74 69 6e 65 73 20 61 72 65 |ese routines are| 00000c00 20 70 72 6f 76 69 64 65 64 2e 20 20 0d 54 68 65 | provided. .The| 00000c10 20 52 45 50 4f 52 54 20 75 74 69 6c 69 74 79 20 | REPORT utility | 00000c20 77 68 69 63 68 20 69 73 20 70 72 6f 76 69 64 65 |which is provide| 00000c30 64 20 77 69 74 68 20 56 69 65 77 53 74 6f 72 65 |d with ViewStore| 00000c40 20 75 73 65 73 20 74 68 65 73 65 20 72 6f 75 74 | uses these rout| 00000c50 69 6e 65 73 2c 20 61 6e 64 0d 69 6d 70 6c 65 6d |ines, and.implem| 00000c60 65 6e 74 73 20 6d 61 6e 79 20 6d 6f 72 65 20 69 |ents many more i| 00000c70 6e 73 69 64 65 20 69 74 73 65 6c 66 2e 20 20 54 |nside itself. T| 00000c80 68 65 20 72 6f 75 74 69 6e 65 20 6d 6f 73 74 20 |he routine most | 00000c90 6f 62 76 69 6f 75 73 6c 79 20 6d 69 73 73 69 6e |obviously missin| 00000ca0 67 20 66 72 6f 6d 0d 74 68 69 73 20 73 65 74 20 |g from.this set | 00000cb0 69 73 20 61 20 72 6f 75 74 69 6e 65 20 74 6f 20 |is a routine to | 00000cc0 6f 75 74 70 75 74 20 61 20 66 6c 6f 61 74 69 6e |output a floatin| 00000cd0 67 20 70 6f 69 6e 74 20 6e 75 6d 62 65 72 20 69 |g point number i| 00000ce0 6e 20 41 53 43 49 49 2e 20 20 49 66 20 79 6f 75 |n ASCII. If you| 00000cf0 0d 77 69 73 68 20 74 6f 20 64 6f 20 74 68 69 73 |.wish to do this| 00000d00 2c 20 79 6f 75 20 77 69 6c 6c 20 68 61 76 65 20 |, you will have | 00000d10 74 6f 20 77 6f 72 6b 20 6f 75 74 20 68 6f 77 20 |to work out how | 00000d20 74 6f 20 64 6f 20 69 74 20 79 6f 75 72 73 65 6c |to do it yoursel| 00000d30 66 2e 0d 0d 49 20 63 61 6e 20 72 65 66 65 72 20 |f...I can refer | 00000d40 79 6f 75 20 74 6f 20 74 68 65 20 22 41 64 76 61 |you to the "Adva| 00000d50 6e 63 65 64 20 42 61 73 69 63 20 52 6f 6d 20 55 |nced Basic Rom U| 00000d60 73 65 72 20 47 75 69 64 65 22 2c 20 70 75 62 6c |ser Guide", publ| 00000d70 69 73 68 65 64 20 62 79 20 74 68 65 0d 22 43 61 |ished by the."Ca| 00000d80 6d 62 72 69 64 67 65 20 4d 69 63 72 6f 63 6f 6d |mbridge Microcom| 00000d90 70 75 74 65 72 20 43 65 6e 74 72 65 22 2c 20 77 |puter Centre", w| 00000da0 68 69 63 68 20 63 6f 6e 74 61 69 6e 73 20 75 73 |hich contains us| 00000db0 65 66 75 6c 20 69 6e 66 6f 72 6d 61 74 69 6f 6e |eful information| 00000dc0 20 61 62 6f 75 74 0d 74 68 65 20 66 6c 6f 61 74 | about.the float| 00000dd0 69 6e 67 20 70 6f 69 6e 74 20 70 61 63 6b 61 67 |ing point packag| 00000de0 65 20 69 6e 20 42 61 73 69 63 2c 20 61 6e 64 20 |e in Basic, and | 00000df0 68 6f 77 20 69 74 20 77 6f 72 6b 73 2e 20 20 54 |how it works. T| 00000e00 68 65 20 66 6c 6f 61 74 69 6e 67 20 70 6f 69 6e |he floating poin| 00000e10 74 0d 69 6e 20 56 69 65 77 53 74 6f 72 65 20 77 |t.in ViewStore w| 00000e20 6f 72 6b 73 20 69 6e 20 74 68 65 20 73 61 6d 65 |orks in the same| 00000e30 20 77 61 79 2e 0d 0d 52 65 6d 65 6d 62 65 72 20 | way...Remember | 00000e40 74 68 61 74 20 74 68 65 72 65 20 69 73 20 6e 6f |that there is no| 00000e50 20 6e 65 65 64 20 74 6f 20 75 6e 64 65 72 73 74 | need to underst| 00000e60 61 6e 64 20 66 6c 6f 61 74 69 6e 67 20 70 6f 69 |and floating poi| 00000e70 6e 74 20 74 6f 20 77 72 69 74 65 20 61 0d 75 74 |nt to write a.ut| 00000e80 69 6c 69 74 79 2c 20 73 69 6e 63 65 20 74 68 65 |ility, since the| 00000e90 20 64 61 74 65 20 69 6e 20 56 69 65 77 53 74 6f | date in ViewSto| 00000ea0 72 65 20 66 69 6c 65 73 20 69 73 20 73 74 6f 72 |re files is stor| 00000eb0 65 64 20 69 6e 20 41 53 43 49 49 20 66 6f 72 6d |ed in ASCII form| 00000ec0 61 74 2c 20 6e 6f 74 20 61 73 0d 66 6c 6f 61 74 |at, not as.float| 00000ed0 69 6e 67 20 70 6f 69 6e 74 20 6e 75 6d 62 65 72 |ing point number| 00000ee0 73 2e 20 20 55 73 65 20 6f 66 20 66 6c 6f 61 74 |s. Use of float| 00000ef0 69 6e 67 20 69 73 20 6f 6e 6c 79 20 6e 65 63 65 |ing is only nece| 00000f00 73 73 61 72 79 20 77 68 65 6e 20 79 6f 75 20 77 |ssary when you w| 00000f10 69 73 68 0d 79 6f 75 72 20 75 74 69 6c 69 74 79 |ish.your utility| 00000f20 20 74 6f 20 70 72 6f 76 69 64 65 20 66 6c 6f 61 | to provide floa| 00000f30 74 69 6e 67 20 70 6f 69 6e 74 20 61 72 69 74 68 |ting point arith| 00000f40 6d 65 74 69 63 2e 0d 0d 54 68 65 20 74 77 6f 20 |metic...The two | 00000f50 61 63 63 75 6d 75 6c 61 74 6f 72 73 2c 20 46 57 |accumulators, FW| 00000f60 52 4b 20 61 6e 64 20 46 41 43 43 20 61 72 65 20 |RK and FACC are | 00000f70 69 6e 20 7a 65 72 6f 20 70 61 67 65 2e 20 20 49 |in zero page. 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FTENFX | 00001050 20 20 20 20 20 20 4d 75 6c 74 69 70 6c 69 65 73 | Multiplies| 00001060 20 46 41 43 43 20 62 79 20 31 30 20 28 6e 6f 74 | FACC by 10 (not| 00001070 20 6e 6f 72 6d 61 6c 69 73 65 64 29 2e 0d 20 20 | normalised).. | 00001080 20 20 20 20 20 20 46 54 45 4e 47 51 20 20 20 20 | FTENGQ | 00001090 20 20 20 44 69 76 69 64 65 73 20 46 41 43 43 20 | Divides FACC | 000010a0 62 79 20 31 30 20 28 6e 6f 74 20 6e 6f 72 6d 61 |by 10 (not norma| 000010b0 6c 69 73 65 64 29 2e 0d 20 20 20 20 20 20 20 20 |lised).. | 000010c0 46 41 44 44 57 49 20 20 20 20 20 20 20 41 64 64 |FADDWI Add| 000010d0 73 20 46 41 43 43 20 61 6e 64 20 46 57 52 4b 3b |s FACC and FWRK;| 000010e0 20 61 6e 73 77 65 72 20 69 6e 20 46 41 43 43 2c | answer in FACC,| 000010f0 20 6e 6f 74 20 72 6f 75 6e 64 65 64 2e 0d 20 20 | not rounded.. | 00001100 20 20 20 20 20 20 46 54 45 4e 58 20 20 20 20 20 | FTENX | 00001110 20 20 20 4d 75 6c 74 69 70 6c 69 65 73 20 6d 61 | Multiplies ma| 00001120 6e 74 69 73 73 61 20 62 79 20 31 30 2e 0d 20 20 |ntissa by 10.. | 00001130 20 20 20 20 20 20 46 52 44 44 4b 20 20 20 20 20 | FRDDK | 00001140 20 20 20 52 65 61 64 73 20 69 6e 20 41 53 43 49 | Reads in ASCI| 00001150 49 20 6e 75 6d 62 65 72 20 74 6f 20 46 41 43 43 |I number to FACC| 00001160 2e 20 20 4c 6f 77 20 62 79 74 65 20 6f 66 20 61 |. Low byte of a| 00001170 64 64 72 65 73 73 20 6f 66 0d 20 20 20 20 20 20 |ddress of. | 00001180 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 73 | s| 00001190 74 72 69 6e 67 20 69 6e 20 41 3b 20 68 69 67 68 |tring in A; high| 000011a0 20 62 79 74 65 20 6f 66 20 61 64 64 72 65 73 73 | byte of address| 000011b0 20 6f 66 20 73 74 72 69 6e 67 20 69 6e 20 59 2e | of string in Y.| 000011c0 0d 20 20 20 20 20 20 20 20 46 54 53 54 20 20 20 |. 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FA| 00001260 44 44 57 20 20 20 20 20 20 20 20 41 64 64 73 20 |DDW Adds | 00001270 46 41 43 43 20 61 6e 64 20 46 57 52 4b 3b 20 61 |FACC and FWRK; a| 00001280 6e 73 77 65 72 20 69 6e 20 46 41 43 43 2c 20 72 |nswer in FACC, r| 00001290 6f 75 6e 64 65 64 2e 0d 20 20 20 20 20 20 20 20 |ounded.. | 000012a0 46 44 49 56 41 20 20 20 20 20 20 20 20 44 69 76 |FDIVA Div| 000012b0 69 64 65 73 20 46 41 43 43 20 62 79 20 46 57 52 |ides FACC by FWR| 000012c0 4b 3b 20 61 6e 73 77 65 72 20 69 6e 20 46 41 43 |K; answer in FAC| 000012d0 43 2e 0d 20 20 20 20 20 20 20 20 46 4d 55 4c 58 |C.. FMULX| 000012e0 20 20 20 20 20 20 20 20 4d 75 6c 74 69 70 6c 65 | Multiple| 000012f0 73 20 46 41 43 43 20 62 79 20 46 57 52 4b 3b 20 |s FACC by FWRK; | 00001300 61 6e 73 77 65 72 20 69 6e 20 46 41 43 43 2e 20 |answer in FACC. | 00001310 0d 0d 0d 47 65 6e 65 72 61 6c 0d 0d 54 68 65 73 |...General..Thes| 00001320 65 20 72 6f 75 74 69 6e 65 73 20 61 72 65 20 61 |e routines are a| 00001330 6e 20 61 73 73 6f 72 74 6d 65 6e 74 20 6f 66 20 |n assortment of | 00001340 75 73 65 66 75 6c 20 73 75 62 72 6f 75 74 69 6e |useful subroutin| 00001350 65 73 20 66 6f 72 20 77 68 69 63 68 20 65 6e 74 |es for which ent| 00001360 72 79 0d 70 6f 69 6e 74 73 20 61 72 65 20 70 72 |ry.points are pr| 00001370 6f 76 69 64 65 64 2e 0d 0d 20 20 20 20 20 20 20 |ovided... | 00001380 20 47 45 54 44 45 43 20 20 20 20 20 20 20 47 65 | GETDEC Ge| 00001390 74 20 61 20 64 65 63 69 6d 61 6c 20 6e 75 6d 62 |t a decimal numb| 000013a0 65 72 2e 0d 20 20 20 20 20 20 20 20 4b 49 4e 43 |er.. 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PSTRNG| 00001460 20 20 20 20 20 20 20 4f 75 74 70 75 74 20 61 20 | Output a | 00001470 73 74 72 69 6e 67 2e 0d 20 20 20 20 20 20 20 20 |string.. | 00001480 52 45 4c 4c 49 4e 20 20 20 20 20 20 20 52 65 61 |RELLIN Rea| 00001490 64 20 61 20 6c 69 6e 65 20 6f 66 20 69 6e 70 75 |d a line of inpu| 000014a0 74 2e 0d 20 20 20 20 20 20 20 20 53 4b 50 43 42 |t.. SKPCB| 000014b0 4c 20 20 20 20 20 20 20 53 6b 69 70 20 62 6c 61 |L Skip bla| 000014c0 6e 6b 73 2e 0d 0d |nks...| 000014c6
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