Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_18.ADF » G/MLet1
G/MLet1
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_18.ADF |
| Filename: | G/MLet1 |
| Read OK: | ✔ |
| File size: | 0433 bytes |
| Load address: | 4D204556 |
| Exec address: | D74654C |
File contents
Matthew Ford
27th November 1994
Dear Gus,
In EUG9 Christopher Chadwick sent in a conversion of
"MorningtonCrescent", to run in Mode 1 on a 64k Electron.
This is a game based onthe London Underground, which was
originally published in the Micro User.I have at last managed
to compress this enough to run on a 32k Electron(still in
MODE 1, apart from the instructions, which are deleted from
memory after they have been read). All of the station names
and numericaldata are now stored directly in memory, and
retrieved using a machine coderoutine (instead of using BASIC
array variables). The game is, however,extremely sluggish,
and passing through King's Cross could mean a verylong wait
for your next move! The memory is also very tight, so if you
want to improve the program, you will probably have to shorten
a message,or remove an unnecessary routine somewhere.
Matthew Ford
00000000 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000030 4d 61 74 74 68 65 77 20 46 6f 72 64 0d 20 20 20 |Matthew Ford. | 00000040 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000060 20 20 20 20 20 20 20 20 32 37 74 68 20 4e 6f 76 | 27th Nov| 00000070 65 6d 62 65 72 20 31 39 39 34 0d 44 65 61 72 20 |ember 1994.Dear | 00000080 47 75 73 2c 0d 0d 20 20 20 20 20 20 20 49 6e 20 |Gus,.. In | 00000090 45 55 47 39 20 43 68 72 69 73 74 6f 70 68 65 72 |EUG9 Christopher| 000000a0 20 43 68 61 64 77 69 63 6b 20 73 65 6e 74 1a 20 | Chadwick sent. | 000000b0 69 6e 1a 20 61 1a 20 63 6f 6e 76 65 72 73 69 6f |in. a. conversio| 000000c0 6e 20 6f 66 20 0d 22 4d 6f 72 6e 69 6e 67 74 6f |n of ."Morningto| 000000d0 6e 10 43 72 65 73 63 65 6e 74 22 2c 20 74 6f 20 |n.Crescent", to | 000000e0 72 75 6e 20 69 6e 20 4d 6f 64 65 20 31 20 6f 6e |run in Mode 1 on| 000000f0 20 61 1a 20 36 34 6b 1a 20 45 6c 65 63 74 72 6f | a. 64k. Electro| 00000100 6e 2e 1a 20 0d 54 68 69 73 20 69 73 20 61 20 67 |n.. .This is a g| 00000110 61 6d 65 20 62 61 73 65 64 20 6f 6e 10 74 68 65 |ame based on.the| 00000120 20 4c 6f 6e 64 6f 6e 20 55 6e 64 65 72 67 72 6f | London Undergro| 00000130 75 6e 64 2c 20 77 68 69 63 68 20 77 61 73 20 0d |und, which was .| 00000140 6f 72 69 67 69 6e 61 6c 6c 79 20 70 75 62 6c 69 |originally publi| 00000150 73 68 65 64 20 69 6e 20 74 68 65 20 4d 69 63 72 |shed in the Micr| 00000160 6f 20 55 73 65 72 2e 10 49 20 68 61 76 65 20 61 |o User..I have a| 00000170 74 20 6c 61 73 74 20 6d 61 6e 61 67 65 64 0d 74 |t last managed.t| 00000180 6f 20 63 6f 6d 70 72 65 73 73 20 74 68 69 73 20 |o compress this | 00000190 65 6e 6f 75 67 68 20 74 6f 20 72 75 6e 1a 20 6f |enough to run. o| 000001a0 6e 1a 20 61 1a 20 33 32 6b 20 45 6c 65 63 74 72 |n. a. 32k Electr| 000001b0 6f 6e 10 28 73 74 69 6c 6c 1a 20 69 6e 1a 20 0d |on.(still. in. .| 000001c0 4d 4f 44 45 1a 20 31 2c 1a 20 61 70 61 72 74 1a |MODE. 1,. apart.| 000001d0 20 66 72 6f 6d 20 74 68 65 20 69 6e 73 74 72 75 | from the instru| 000001e0 63 74 69 6f 6e 73 2c 20 77 68 69 63 68 20 61 72 |ctions, which ar| 000001f0 65 20 64 65 6c 65 74 65 64 20 66 72 6f 6d 10 0d |e deleted from..| 00000200 6d 65 6d 6f 72 79 20 61 66 74 65 72 20 74 68 65 |memory after the| 00000210 79 20 68 61 76 65 20 62 65 65 6e 20 72 65 61 64 |y have been read| 00000220 29 2e 1a 20 41 6c 6c 20 6f 66 20 74 68 65 20 73 |).. All of the s| 00000230 74 61 74 69 6f 6e 20 6e 61 6d 65 73 20 0d 61 6e |tation names .an| 00000240 64 20 6e 75 6d 65 72 69 63 61 6c 10 64 61 74 61 |d numerical.data| 00000250 20 61 72 65 20 6e 6f 77 20 73 74 6f 72 65 64 20 | are now stored | 00000260 64 69 72 65 63 74 6c 79 20 69 6e 20 6d 65 6d 6f |directly in memo| 00000270 72 79 2c 20 61 6e 64 20 0d 72 65 74 72 69 65 76 |ry, and .retriev| 00000280 65 64 20 75 73 69 6e 67 20 61 20 6d 61 63 68 69 |ed using a machi| 00000290 6e 65 20 63 6f 64 65 10 72 6f 75 74 69 6e 65 20 |ne code.routine | 000002a0 28 69 6e 73 74 65 61 64 20 6f 66 20 75 73 69 6e |(instead of usin| 000002b0 67 20 42 41 53 49 43 20 0d 61 72 72 61 79 20 76 |g BASIC .array v| 000002c0 61 72 69 61 62 6c 65 73 29 2e 1a 20 54 68 65 1a |ariables).. The.| 000002d0 20 67 61 6d 65 1a 20 69 73 2c 20 68 6f 77 65 76 | game. is, howev| 000002e0 65 72 2c 10 65 78 74 72 65 6d 65 6c 79 1a 20 73 |er,.extremely. s| 000002f0 6c 75 67 67 69 73 68 2c 1a 20 0d 61 6e 64 1a 20 |luggish,. .and. | 00000300 70 61 73 73 69 6e 67 1a 20 74 68 72 6f 75 67 68 |passing. through| 00000310 20 4b 69 6e 67 27 73 20 43 72 6f 73 73 20 63 6f | King's Cross co| 00000320 75 6c 64 20 6d 65 61 6e 20 61 20 76 65 72 79 10 |uld mean a very.| 00000330 6c 6f 6e 67 20 77 61 69 74 20 0d 66 6f 72 20 79 |long wait .for y| 00000340 6f 75 72 20 6e 65 78 74 1a 20 6d 6f 76 65 21 20 |our next. move! | 00000350 54 68 65 1a 20 6d 65 6d 6f 72 79 1a 20 69 73 20 |The. memory. is | 00000360 61 6c 73 6f 20 76 65 72 79 20 74 69 67 68 74 2c |also very tight,| 00000370 20 73 6f 20 69 66 20 79 6f 75 10 0d 77 61 6e 74 | so if you..want| 00000380 20 74 6f 20 69 6d 70 72 6f 76 65 20 74 68 65 20 | to improve the | 00000390 70 72 6f 67 72 61 6d 2c 20 79 6f 75 20 77 69 6c |program, you wil| 000003a0 6c 20 70 72 6f 62 61 62 6c 79 20 68 61 76 65 1a |l probably have.| 000003b0 20 74 6f 20 73 68 6f 72 74 65 6e 20 0d 61 20 6d | to shorten .a m| 000003c0 65 73 73 61 67 65 2c 10 6f 72 20 72 65 6d 6f 76 |essage,.or remov| 000003d0 65 20 61 6e 20 75 6e 6e 65 63 65 73 73 61 72 79 |e an unnecessary| 000003e0 20 72 6f 75 74 69 6e 65 20 73 6f 6d 65 77 68 65 | routine somewhe| 000003f0 72 65 2e 0d 0d 0d 20 20 20 20 20 20 20 20 20 20 |re.... | 00000400 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000420 20 20 20 20 20 20 4d 61 74 74 68 65 77 20 46 6f | Matthew Fo| 00000430 72 64 0d |rd.| 00000433
G/MLet1.m0
G/MLet1.m1
G/MLet1.m2
G/MLet1.m4
G/MLet1.m5
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