AnachronautandClaude Opus 5
0b6d2be43f
Two changes that arrived together because both live in cosmos.asm. THE SERVICES. A loaded program that wanted a file had to include the whole filesystem, carrying two and a half kilobytes of a private copy of code the system already had running, and then mount a disk that was already mounted. Five services are added at pinned numbers 20 to 24: osFileRead, osFileSave, osFileDelete, osFileRename and osPrintNumber. The sizes fit the registers exactly in both directions. A file that can be read into Data Memory is under 64K by definition, so its length is sixteen bits: coming back it is DP3, going out it is A and B together, and neither direction needs a record in memory whose shape both sides must agree on. There is deliberately no service to mount a disk. The system mounts one before its first prompt, and a program mounting it again was only ever a consequence of owning a second copy of the library, so that call disappears rather than moving. Apps/Files.asm writes, reads, renames and deletes a file in 645 bytes and includes nothing but the service names. THE MONITOR. Previously an application, now part of the shell, because an application occupies the one region a loaded application is given: a monitor that was an application could never examine another one, since loading the thing to be inspected would replace the thing doing the inspecting. "monitor" turns it on and the prompt becomes "*". It is a mode rather than a sub-prompt, and it persists: because the mode is a variable the prompt reads rather than a second loop, and every path back to the prompt goes through one place including osExit, a program started with "g" that gives the machine back arrives at the monitor prompt it was started from. Examining a program and running it therefore do not interrupt each other. "exit" leaves whatever you are in. It supersedes dump, and adds disassembly, writing bytes, and jumping to an address. Its instruction table is generated from the assembler's own list by Tests/instructiontable.py rather than typed again, and Tests/docs.sh checks both that the system's copy matches the generator and that the lengths that table implies are the ones the manual's Bytes column prints. A disassembler that disagreed about a length would not print one line wrong, it would lose its place and print everything after it wrong. Also here: b refuses a bank that is not registered, since asking the controller for one is refused and a refusal nobody catches stops the machine; g records the Stack the way run does, without which a program returning through osExit restored whatever the last run had left; and make cosmos-disk now depends on the system as well as the image. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
32 lines
1.4 KiB
Plaintext
32 lines
1.4 KiB
Plaintext
CosmOS
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> x examine, d disassemble, s set, b bank, g go, exit leaves
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* b <program|data|number>
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* there is no such bank
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* loaded, starting at 2000
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* bank 00
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* 2000 47 00 10 00 SETD.0 1000
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2004 18 10 SWI 10
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2006 47 00 10 44 SETD.0 1044
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200A 18 10 SWI 10
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200C 47 00 10 7A SETD.0 107A
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2010 27 1F INIB 1F
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2012 18 11 SWI 11
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2014 47 00 10 5D SETD.0 105D
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* 2000 47 00 10 00 18 10 47 00 10 44 18 10 47 00 10 7A G.....G..D..G..z
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2010 27 1F 18 11 47 00 10 5D 18 10 47 00 10 7A 18 10 '...G..]..G..z..
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2020 47 00 10 65 18 10 18 12 00 00 00 00 00 00 00 00 G..e............
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2030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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* bank 01
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* 1000 61 20 70 72 6F 67 72 61 6D 2C 20 6C 6F 61 64 65 a program, loade
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1010 64 20 6F 66 66 20 61 20 64 69 73 6B 2C 20 72 75 d off a disk, ru
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1020 6E 6E 69 6E 67 20 6F 6E 20 74 68 65 20 73 79 73 nning on the sys
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1030 74 65 6D 20 74 68 61 74 20 6C 6F 61 64 65 64 20 tem that loaded
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* bank 02
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* 0000 01 FF 00 00 00 00 00 00 01 FF 00 00 00 00 00 00 ................
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0010 03 FF 08 00 00 00 00 00 01 20 01 00 00 00 00 00 ......... ......
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0020 00 FF 00 00 00 00 00 00 00 FF 00 00 00 00 00 00 ................
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0030 00 FF 00 00 00 00 00 00 00 FF 00 00 00 00 00 00 ................
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* Fault: The device on port 233 refused the access at Program Address 0x1359, and nothing is installed to deal with it.
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Execution halted.
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[exit 1]
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