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PT4/P/+P1
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 » Greaseweazled » dfs_box04_disk02b_eug_scripts.adf |
| Filename: | PT4/P/+P1 |
| Read OK: | ✔ |
| File size: | 0CBF bytes |
| Load address: | D6576 |
| Exec address: | 0000 |
Duplicates
There are 2 duplicate copies of this file in the archive:
- Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_39.ADF » P/+P1
- Personal collection » Acorn ADFS disks » Greaseweazled » dfs_box04_disk02b_eug_scripts.adf » PT4/P/+P1
- Personal collection » Acorn hard disk » zipped_disks » elk03 » eug39/P/+P1
File contents
Programming Technique Part 4: Graphics - Screen Memory access from BASIC Written by Dominic Ford In the last EUG issue I described how screen memory is laid out, and how this knowledge can be of use to the programmer. The problem is that this is all of little use in BASIC - your program would crawl along if it tried to display graphics by directly accessing screen memory from BASIC. The only technique which is of use if you don't know machine code is that of using *LOAD and *SAVE to reload a previous screen memory display. This doesn't mean, however, that it is impossible for BASIC programmers to make use of screen memory techniques. The only part of your program which has to be an machine code is the part which accesses screen memory - the rest can be in BASIC. Let's say, for example, that you are writing a game which requires a sprite to move across the screen. The part of the program which physically plots the sprite into screen memory must be in machine code to be able to achieve reasonable speed. But the part of the program which manipulates the sprite, keeps track of your score, checks if you've walking into an enemy sprite, etc. can all be done in BASIC. This means that if BASIC programmers could have a module of machine code which does the screen memory access for them, and which they can call every time the want to display a sprite on the screen, they too could make use of this powerful technique. That is exactly what I am providing in this issue of EUG - a small machine code module which BASIC programmers can use to plot multi-coloured sprites onto the screen. There are even a couple of sample demonstrations to show how the module can be put to use. Obviously such a system does have some limitations - whereas machine code programmers can devise a specialist module for the particular needs of their program, this module does force the user into following certain rules in their program. The main limitations are: - Your program must operate in MODE 2 when the module is being used to produce the graphics. - Your sprites must consist of blocks of 8x8 pixels (one character), although larger sprites can be used simply by tiling several one character sprites together, side by side. - Your program must not make use of memory locations above &2C00. This does put quite a severe size limit on your program on an ADFS system. If you recieve "No Room" error messages when you try to use your program, you've hit that limit! - You must not use conventional VDU23 style user-defined characters in your program, because this module uses the same workspace as these. Before you can use the module, you must design some sprites for it to display. This is done using the program 'Editor' which is available at the end of this article, or can be found in the 'P' directory of this EUG disc. If you don't want to get artistic at this stage of trying out the module, there are a couple of files of sample sprites included with the editor: 'B+B' are those used by the bat and ball demonstration and 'WalkSpr' are those used by the 'Walking' demonstration. For the moment I will assume that you are using these sample sprite files - more details on how to create your own sprite files using the editor program will be given later.
00000000 50 72 6f 67 72 61 6d 6d 69 6e 67 20 54 65 63 68 |Programming Tech| 00000010 6e 69 71 75 65 0d 50 61 72 74 20 34 3a 20 47 72 |nique.Part 4: Gr| 00000020 61 70 68 69 63 73 20 2d 20 53 63 72 65 65 6e 20 |aphics - Screen | 00000030 4d 65 6d 6f 72 79 20 61 63 63 65 73 73 20 66 72 |Memory access fr| 00000040 6f 6d 20 42 41 53 49 43 0d 0d 57 72 69 74 74 65 |om BASIC..Writte| 00000050 6e 20 62 79 20 44 6f 6d 69 6e 69 63 20 46 6f 72 |n by Dominic For| 00000060 64 0d 0d 49 6e 20 74 68 65 20 6c 61 73 74 20 45 |d..In the last E| 00000070 55 47 20 69 73 73 75 65 20 49 20 64 65 73 63 72 |UG issue I descr| 00000080 69 62 65 64 20 68 6f 77 20 73 63 72 65 65 6e 20 |ibed how screen | 00000090 6d 65 6d 6f 72 79 20 69 73 20 6c 61 69 64 20 6f |memory is laid o| 000000a0 75 74 2c 20 61 6e 64 20 68 6f 77 0d 74 68 69 73 |ut, and how.this| 000000b0 20 6b 6e 6f 77 6c 65 64 67 65 20 63 61 6e 20 62 | knowledge can b| 000000c0 65 20 6f 66 20 75 73 65 20 74 6f 20 74 68 65 20 |e of use to the | 000000d0 70 72 6f 67 72 61 6d 6d 65 72 2e 20 54 68 65 20 |programmer. The | 000000e0 70 72 6f 62 6c 65 6d 20 69 73 20 74 68 61 74 20 |problem is that | 000000f0 74 68 69 73 0d 69 73 20 61 6c 6c 20 6f 66 20 6c |this.is all of l| 00000100 69 74 74 6c 65 20 75 73 65 20 69 6e 20 42 41 53 |ittle use in BAS| 00000110 49 43 20 2d 20 79 6f 75 72 20 70 72 6f 67 72 61 |IC - your progra| 00000120 6d 20 77 6f 75 6c 64 20 63 72 61 77 6c 20 61 6c |m would crawl al| 00000130 6f 6e 67 20 69 66 20 69 74 20 74 72 69 65 64 0d |ong if it tried.| 00000140 74 6f 20 64 69 73 70 6c 61 79 20 67 72 61 70 68 |to display graph| 00000150 69 63 73 20 62 79 20 64 69 72 65 63 74 6c 79 20 |ics by directly | 00000160 61 63 63 65 73 73 69 6e 67 20 73 63 72 65 65 6e |accessing screen| 00000170 20 6d 65 6d 6f 72 79 20 66 72 6f 6d 20 42 41 53 | memory from BAS| 00000180 49 43 2e 20 54 68 65 0d 6f 6e 6c 79 20 74 65 63 |IC. The.only tec| 00000190 68 6e 69 71 75 65 20 77 68 69 63 68 20 69 73 20 |hnique which is | 000001a0 6f 66 20 75 73 65 20 69 66 20 79 6f 75 20 64 6f |of use if you do| 000001b0 6e 27 74 20 6b 6e 6f 77 20 6d 61 63 68 69 6e 65 |n't know machine| 000001c0 20 63 6f 64 65 20 69 73 20 74 68 61 74 20 6f 66 | code is that of| 000001d0 0d 75 73 69 6e 67 20 2a 4c 4f 41 44 20 61 6e 64 |.using *LOAD and| 000001e0 20 2a 53 41 56 45 20 74 6f 20 72 65 6c 6f 61 64 | *SAVE to reload| 000001f0 20 61 20 70 72 65 76 69 6f 75 73 20 73 63 72 65 | a previous scre| 00000200 65 6e 20 6d 65 6d 6f 72 79 20 64 69 73 70 6c 61 |en memory displa| 00000210 79 2e 0d 0d 54 68 69 73 20 64 6f 65 73 6e 27 74 |y...This doesn't| 00000220 20 6d 65 61 6e 2c 20 68 6f 77 65 76 65 72 2c 20 | mean, however, | 00000230 74 68 61 74 20 69 74 20 69 73 20 69 6d 70 6f 73 |that it is impos| 00000240 73 69 62 6c 65 20 66 6f 72 20 42 41 53 49 43 20 |sible for BASIC | 00000250 70 72 6f 67 72 61 6d 6d 65 72 73 20 74 6f 0d 6d |programmers to.m| 00000260 61 6b 65 20 75 73 65 20 6f 66 20 73 63 72 65 65 |ake use of scree| 00000270 6e 20 6d 65 6d 6f 72 79 20 74 65 63 68 6e 69 71 |n memory techniq| 00000280 75 65 73 2e 20 54 68 65 20 6f 6e 6c 79 20 70 61 |ues. The only pa| 00000290 72 74 20 6f 66 20 79 6f 75 72 20 70 72 6f 67 72 |rt of your progr| 000002a0 61 6d 20 77 68 69 63 68 0d 68 61 73 20 74 6f 20 |am which.has to | 000002b0 62 65 20 61 6e 20 6d 61 63 68 69 6e 65 20 63 6f |be an machine co| 000002c0 64 65 20 69 73 20 74 68 65 20 70 61 72 74 20 77 |de is the part w| 000002d0 68 69 63 68 20 61 63 63 65 73 73 65 73 20 73 63 |hich accesses sc| 000002e0 72 65 65 6e 20 6d 65 6d 6f 72 79 20 2d 20 74 68 |reen memory - th| 000002f0 65 0d 72 65 73 74 20 63 61 6e 20 62 65 20 69 6e |e.rest can be in| 00000300 20 42 41 53 49 43 2e 20 4c 65 74 27 73 20 73 61 | BASIC. Let's sa| 00000310 79 2c 20 66 6f 72 20 65 78 61 6d 70 6c 65 2c 20 |y, for example, | 00000320 74 68 61 74 20 79 6f 75 20 61 72 65 20 77 72 69 |that you are wri| 00000330 74 69 6e 67 20 61 20 67 61 6d 65 0d 77 68 69 63 |ting a game.whic| 00000340 68 20 72 65 71 75 69 72 65 73 20 61 20 73 70 72 |h requires a spr| 00000350 69 74 65 20 74 6f 20 6d 6f 76 65 20 61 63 72 6f |ite to move acro| 00000360 73 73 20 74 68 65 20 73 63 72 65 65 6e 2e 20 54 |ss the screen. T| 00000370 68 65 20 70 61 72 74 20 6f 66 20 74 68 65 20 70 |he part of the p| 00000380 72 6f 67 72 61 6d 0d 77 68 69 63 68 20 70 68 79 |rogram.which phy| 00000390 73 69 63 61 6c 6c 79 20 70 6c 6f 74 73 20 74 68 |sically plots th| 000003a0 65 20 73 70 72 69 74 65 20 69 6e 74 6f 20 73 63 |e sprite into sc| 000003b0 72 65 65 6e 20 6d 65 6d 6f 72 79 20 6d 75 73 74 |reen memory must| 000003c0 20 62 65 20 69 6e 20 6d 61 63 68 69 6e 65 0d 63 | be in machine.c| 000003d0 6f 64 65 20 74 6f 20 62 65 20 61 62 6c 65 20 74 |ode to be able t| 000003e0 6f 20 61 63 68 69 65 76 65 20 72 65 61 73 6f 6e |o achieve reason| 000003f0 61 62 6c 65 20 73 70 65 65 64 2e 20 42 75 74 20 |able speed. But | 00000400 74 68 65 20 70 61 72 74 20 6f 66 20 74 68 65 20 |the part of the | 00000410 70 72 6f 67 72 61 6d 0d 77 68 69 63 68 20 6d 61 |program.which ma| 00000420 6e 69 70 75 6c 61 74 65 73 20 74 68 65 20 73 70 |nipulates the sp| 00000430 72 69 74 65 2c 20 6b 65 65 70 73 20 74 72 61 63 |rite, keeps trac| 00000440 6b 20 6f 66 20 79 6f 75 72 20 73 63 6f 72 65 2c |k of your score,| 00000450 20 63 68 65 63 6b 73 20 69 66 20 79 6f 75 27 76 | checks if you'v| 00000460 65 0d 77 61 6c 6b 69 6e 67 20 69 6e 74 6f 20 61 |e.walking into a| 00000470 6e 20 65 6e 65 6d 79 20 73 70 72 69 74 65 2c 20 |n enemy sprite, | 00000480 65 74 63 2e 20 63 61 6e 20 61 6c 6c 20 62 65 20 |etc. can all be | 00000490 64 6f 6e 65 20 69 6e 20 42 41 53 49 43 2e 0d 0d |done in BASIC...| 000004a0 54 68 69 73 20 6d 65 61 6e 73 20 74 68 61 74 20 |This means that | 000004b0 69 66 20 42 41 53 49 43 20 70 72 6f 67 72 61 6d |if BASIC program| 000004c0 6d 65 72 73 20 63 6f 75 6c 64 20 68 61 76 65 20 |mers could have | 000004d0 61 20 6d 6f 64 75 6c 65 20 6f 66 20 6d 61 63 68 |a module of mach| 000004e0 69 6e 65 20 63 6f 64 65 0d 77 68 69 63 68 20 64 |ine code.which d| 000004f0 6f 65 73 20 74 68 65 20 73 63 72 65 65 6e 20 6d |oes the screen m| 00000500 65 6d 6f 72 79 20 61 63 63 65 73 73 20 66 6f 72 |emory access for| 00000510 20 74 68 65 6d 2c 20 61 6e 64 20 77 68 69 63 68 | them, and which| 00000520 20 74 68 65 79 20 63 61 6e 20 63 61 6c 6c 0d 65 | they can call.e| 00000530 76 65 72 79 20 74 69 6d 65 20 74 68 65 20 77 61 |very time the wa| 00000540 6e 74 20 74 6f 20 64 69 73 70 6c 61 79 20 61 20 |nt to display a | 00000550 73 70 72 69 74 65 20 6f 6e 20 74 68 65 20 73 63 |sprite on the sc| 00000560 72 65 65 6e 2c 20 74 68 65 79 20 74 6f 6f 20 63 |reen, they too c| 00000570 6f 75 6c 64 20 6d 61 6b 65 0d 75 73 65 20 6f 66 |ould make.use of| 00000580 20 74 68 69 73 20 70 6f 77 65 72 66 75 6c 20 74 | this powerful t| 00000590 65 63 68 6e 69 71 75 65 2e 20 54 68 61 74 20 69 |echnique. That i| 000005a0 73 20 65 78 61 63 74 6c 79 20 77 68 61 74 20 49 |s exactly what I| 000005b0 20 61 6d 20 70 72 6f 76 69 64 69 6e 67 20 69 6e | am providing in| 000005c0 0d 74 68 69 73 20 69 73 73 75 65 20 6f 66 20 45 |.this issue of E| 000005d0 55 47 20 2d 20 61 20 73 6d 61 6c 6c 20 6d 61 63 |UG - a small mac| 000005e0 68 69 6e 65 20 63 6f 64 65 20 6d 6f 64 75 6c 65 |hine code module| 000005f0 20 77 68 69 63 68 20 42 41 53 49 43 20 70 72 6f | which BASIC pro| 00000600 67 72 61 6d 6d 65 72 73 0d 63 61 6e 20 75 73 65 |grammers.can use| 00000610 20 74 6f 20 70 6c 6f 74 20 6d 75 6c 74 69 2d 63 | to plot multi-c| 00000620 6f 6c 6f 75 72 65 64 20 73 70 72 69 74 65 73 20 |oloured sprites | 00000630 6f 6e 74 6f 20 74 68 65 20 73 63 72 65 65 6e 2e |onto the screen.| 00000640 20 54 68 65 72 65 20 61 72 65 20 65 76 65 6e 20 | There are even | 00000650 61 0d 63 6f 75 70 6c 65 20 6f 66 20 73 61 6d 70 |a.couple of samp| 00000660 6c 65 20 64 65 6d 6f 6e 73 74 72 61 74 69 6f 6e |le demonstration| 00000670 73 20 74 6f 20 73 68 6f 77 20 68 6f 77 20 74 68 |s to show how th| 00000680 65 20 6d 6f 64 75 6c 65 20 63 61 6e 20 62 65 20 |e module can be | 00000690 70 75 74 20 74 6f 20 75 73 65 2e 0d 0d 4f 62 76 |put to use...Obv| 000006a0 69 6f 75 73 6c 79 20 73 75 63 68 20 61 20 73 79 |iously such a sy| 000006b0 73 74 65 6d 20 64 6f 65 73 20 68 61 76 65 20 73 |stem does have s| 000006c0 6f 6d 65 20 6c 69 6d 69 74 61 74 69 6f 6e 73 20 |ome limitations | 000006d0 2d 20 77 68 65 72 65 61 73 20 6d 61 63 68 69 6e |- whereas machin| 000006e0 65 0d 63 6f 64 65 20 70 72 6f 67 72 61 6d 6d 65 |e.code programme| 000006f0 72 73 20 63 61 6e 20 64 65 76 69 73 65 20 61 20 |rs can devise a | 00000700 73 70 65 63 69 61 6c 69 73 74 20 6d 6f 64 75 6c |specialist modul| 00000710 65 20 66 6f 72 20 74 68 65 20 70 61 72 74 69 63 |e for the partic| 00000720 75 6c 61 72 20 6e 65 65 64 73 0d 6f 66 20 74 68 |ular needs.of th| 00000730 65 69 72 20 70 72 6f 67 72 61 6d 2c 20 74 68 69 |eir program, thi| 00000740 73 20 6d 6f 64 75 6c 65 20 64 6f 65 73 20 66 6f |s module does fo| 00000750 72 63 65 20 74 68 65 20 75 73 65 72 20 69 6e 74 |rce the user int| 00000760 6f 20 66 6f 6c 6c 6f 77 69 6e 67 20 63 65 72 74 |o following cert| 00000770 61 69 6e 0d 72 75 6c 65 73 20 69 6e 20 74 68 65 |ain.rules in the| 00000780 69 72 20 70 72 6f 67 72 61 6d 2e 20 54 68 65 20 |ir program. The | 00000790 6d 61 69 6e 20 6c 69 6d 69 74 61 74 69 6f 6e 73 |main limitations| 000007a0 20 61 72 65 3a 0d 0d 2d 20 59 6f 75 72 20 70 72 | are:..- Your pr| 000007b0 6f 67 72 61 6d 20 6d 75 73 74 20 6f 70 65 72 61 |ogram must opera| 000007c0 74 65 20 69 6e 20 4d 4f 44 45 20 32 20 77 68 65 |te in MODE 2 whe| 000007d0 6e 20 74 68 65 20 6d 6f 64 75 6c 65 20 69 73 20 |n the module is | 000007e0 62 65 69 6e 67 20 75 73 65 64 20 74 6f 0d 70 72 |being used to.pr| 000007f0 6f 64 75 63 65 20 74 68 65 20 67 72 61 70 68 69 |oduce the graphi| 00000800 63 73 2e 0d 2d 20 59 6f 75 72 20 73 70 72 69 74 |cs..- Your sprit| 00000810 65 73 20 6d 75 73 74 20 63 6f 6e 73 69 73 74 20 |es must consist | 00000820 6f 66 20 62 6c 6f 63 6b 73 20 6f 66 20 38 78 38 |of blocks of 8x8| 00000830 20 70 69 78 65 6c 73 20 28 6f 6e 65 20 63 68 61 | pixels (one cha| 00000840 72 61 63 74 65 72 29 2c 0d 61 6c 74 68 6f 75 67 |racter),.althoug| 00000850 68 20 6c 61 72 67 65 72 20 73 70 72 69 74 65 73 |h larger sprites| 00000860 20 63 61 6e 20 62 65 20 75 73 65 64 20 73 69 6d | can be used sim| 00000870 70 6c 79 20 62 79 20 74 69 6c 69 6e 67 20 73 65 |ply by tiling se| 00000880 76 65 72 61 6c 20 6f 6e 65 20 63 68 61 72 61 63 |veral one charac| 00000890 74 65 72 0d 73 70 72 69 74 65 73 20 74 6f 67 65 |ter.sprites toge| 000008a0 74 68 65 72 2c 20 73 69 64 65 20 62 79 20 73 69 |ther, side by si| 000008b0 64 65 2e 0d 2d 20 59 6f 75 72 20 70 72 6f 67 72 |de..- Your progr| 000008c0 61 6d 20 6d 75 73 74 20 6e 6f 74 20 6d 61 6b 65 |am must not make| 000008d0 20 75 73 65 20 6f 66 20 6d 65 6d 6f 72 79 20 6c | use of memory l| 000008e0 6f 63 61 74 69 6f 6e 73 20 61 62 6f 76 65 20 26 |ocations above &| 000008f0 32 43 30 30 2e 20 54 68 69 73 0d 64 6f 65 73 20 |2C00. This.does | 00000900 70 75 74 20 71 75 69 74 65 20 61 20 73 65 76 65 |put quite a seve| 00000910 72 65 20 73 69 7a 65 20 6c 69 6d 69 74 20 6f 6e |re size limit on| 00000920 20 79 6f 75 72 20 70 72 6f 67 72 61 6d 20 6f 6e | your program on| 00000930 20 61 6e 20 41 44 46 53 20 73 79 73 74 65 6d 2e | an ADFS system.| 00000940 20 49 66 0d 79 6f 75 20 72 65 63 69 65 76 65 20 | If.you recieve | 00000950 22 4e 6f 20 52 6f 6f 6d 22 20 65 72 72 6f 72 20 |"No Room" error | 00000960 6d 65 73 73 61 67 65 73 20 77 68 65 6e 20 79 6f |messages when yo| 00000970 75 20 74 72 79 20 74 6f 20 75 73 65 20 79 6f 75 |u try to use you| 00000980 72 20 70 72 6f 67 72 61 6d 2c 0d 79 6f 75 27 76 |r program,.you'v| 00000990 65 20 68 69 74 20 74 68 61 74 20 6c 69 6d 69 74 |e hit that limit| 000009a0 21 0d 2d 20 59 6f 75 20 6d 75 73 74 20 6e 6f 74 |!.- You must not| 000009b0 20 75 73 65 20 63 6f 6e 76 65 6e 74 69 6f 6e 61 | use conventiona| 000009c0 6c 20 56 44 55 32 33 20 73 74 79 6c 65 20 75 73 |l VDU23 style us| 000009d0 65 72 2d 64 65 66 69 6e 65 64 20 63 68 61 72 61 |er-defined chara| 000009e0 63 74 65 72 73 20 69 6e 0d 79 6f 75 72 20 70 72 |cters in.your pr| 000009f0 6f 67 72 61 6d 2c 20 62 65 63 61 75 73 65 20 74 |ogram, because t| 00000a00 68 69 73 20 6d 6f 64 75 6c 65 20 75 73 65 73 20 |his module uses | 00000a10 74 68 65 20 73 61 6d 65 20 77 6f 72 6b 73 70 61 |the same workspa| 00000a20 63 65 20 61 73 20 74 68 65 73 65 2e 0d 0d 42 65 |ce as these...Be| 00000a30 66 6f 72 65 20 79 6f 75 20 63 61 6e 20 75 73 65 |fore you can use| 00000a40 20 74 68 65 20 6d 6f 64 75 6c 65 2c 20 79 6f 75 | the module, you| 00000a50 20 6d 75 73 74 20 64 65 73 69 67 6e 20 73 6f 6d | must design som| 00000a60 65 20 73 70 72 69 74 65 73 20 66 6f 72 20 69 74 |e sprites for it| 00000a70 20 74 6f 0d 64 69 73 70 6c 61 79 2e 20 54 68 69 | to.display. Thi| 00000a80 73 20 69 73 20 64 6f 6e 65 20 75 73 69 6e 67 20 |s is done using | 00000a90 74 68 65 20 70 72 6f 67 72 61 6d 20 27 45 64 69 |the program 'Edi| 00000aa0 74 6f 72 27 20 77 68 69 63 68 20 69 73 20 61 76 |tor' which is av| 00000ab0 61 69 6c 61 62 6c 65 20 61 74 20 74 68 65 0d 65 |ailable at the.e| 00000ac0 6e 64 20 6f 66 20 74 68 69 73 20 61 72 74 69 63 |nd of this artic| 00000ad0 6c 65 2c 20 6f 72 20 63 61 6e 20 62 65 20 66 6f |le, or can be fo| 00000ae0 75 6e 64 20 69 6e 20 74 68 65 20 27 50 27 20 64 |und in the 'P' d| 00000af0 69 72 65 63 74 6f 72 79 20 6f 66 20 74 68 69 73 |irectory of this| 00000b00 20 45 55 47 0d 64 69 73 63 2e 20 49 66 20 79 6f | EUG.disc. If yo| 00000b10 75 20 64 6f 6e 27 74 20 77 61 6e 74 20 74 6f 20 |u don't want to | 00000b20 67 65 74 20 61 72 74 69 73 74 69 63 20 61 74 20 |get artistic at | 00000b30 74 68 69 73 20 73 74 61 67 65 20 6f 66 20 74 72 |this stage of tr| 00000b40 79 69 6e 67 20 6f 75 74 20 74 68 65 0d 6d 6f 64 |ying out the.mod| 00000b50 75 6c 65 2c 20 74 68 65 72 65 20 61 72 65 20 61 |ule, there are a| 00000b60 20 63 6f 75 70 6c 65 20 6f 66 20 66 69 6c 65 73 | couple of files| 00000b70 20 6f 66 20 73 61 6d 70 6c 65 20 73 70 72 69 74 | of sample sprit| 00000b80 65 73 20 69 6e 63 6c 75 64 65 64 20 77 69 74 68 |es included with| 00000b90 20 74 68 65 0d 65 64 69 74 6f 72 3a 20 27 42 2b | the.editor: 'B+| 00000ba0 42 27 20 61 72 65 20 74 68 6f 73 65 20 75 73 65 |B' are those use| 00000bb0 64 20 62 79 20 74 68 65 20 62 61 74 20 61 6e 64 |d by the bat and| 00000bc0 20 62 61 6c 6c 20 64 65 6d 6f 6e 73 74 72 61 74 | ball demonstrat| 00000bd0 69 6f 6e 20 61 6e 64 0d 27 57 61 6c 6b 53 70 72 |ion and.'WalkSpr| 00000be0 27 20 61 72 65 20 74 68 6f 73 65 20 75 73 65 64 |' are those used| 00000bf0 20 62 79 20 74 68 65 20 27 57 61 6c 6b 69 6e 67 | by the 'Walking| 00000c00 27 20 64 65 6d 6f 6e 73 74 72 61 74 69 6f 6e 2e |' demonstration.| 00000c10 20 46 6f 72 20 74 68 65 20 6d 6f 6d 65 6e 74 20 | For the moment | 00000c20 49 0d 77 69 6c 6c 20 61 73 73 75 6d 65 20 74 68 |I.will assume th| 00000c30 61 74 20 79 6f 75 20 61 72 65 20 75 73 69 6e 67 |at you are using| 00000c40 20 74 68 65 73 65 20 73 61 6d 70 6c 65 20 73 70 | these sample sp| 00000c50 72 69 74 65 20 66 69 6c 65 73 20 2d 20 6d 6f 72 |rite files - mor| 00000c60 65 20 64 65 74 61 69 6c 73 20 6f 6e 0d 68 6f 77 |e details on.how| 00000c70 20 74 6f 20 63 72 65 61 74 65 20 79 6f 75 72 20 | to create your | 00000c80 6f 77 6e 20 73 70 72 69 74 65 20 66 69 6c 65 73 |own sprite files| 00000c90 20 75 73 69 6e 67 20 74 68 65 20 65 64 69 74 6f | using the edito| 00000ca0 72 20 70 72 6f 67 72 61 6d 20 77 69 6c 6c 20 62 |r program will b| 00000cb0 65 20 67 69 76 65 6e 0d 6c 61 74 65 72 2e 0d |e given.later..| 00000cbf
PT4/P/+P1.m0
PT4/P/+P1.m1
PT4/P/+P1.m2
PT4/P/+P1.m4
PT4/P/+P1.m5
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