AnachronautandClaude Opus 5
5fd995aa62
A breakpoint that shows every register as the program had them, waits for a key, and carries on. NOTHING IS OVERWRITTEN, and that is the design rather than a shortcut. A breakpoint poked into a running program has to replace an instruction, and putting that instruction back in order to continue is the same act as disarming the breakpoint; firing a second time would mean stepping over the restored instruction and putting the breakpoint back behind it, and this machine cannot step a single instruction. SWI is two bytes, dispatches through a vector, and its frame already holds the address after it, so RETI resumes at the next instruction with nothing to restore and nothing to re-arm. It fires every time it is reached. The price is that a breakpoint is part of the program: a build with them in has different addresses from a build without. That is the bargain every machine with a break instruction makes. Every value shown comes out of the frame rather than the registers, because by the time the handler runs the registers are the handler's. Apps/Break.asm stops twice so that the second stop is checked as well as the first. Also here, found by the test that came with it: the monitor's s wrote into whichever bank was selected, and bank 2 is the controller's own table, published read only. Writing to it was refused, and a refusal nobody catches stops the machine - so selecting the bank table to look at it and then typing s killed the session. bankPresent now keeps the whole flags byte and s declines. The recorded output of cosmosMonitor had contained that crash, having been blessed without being read. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
61 lines
2.0 KiB
Plaintext
61 lines
2.0 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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* that bank will not be written
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* bank 00
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* * 8000 26 48 INIA 48
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8002 D1 00 OUTA 00
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8004 26 0A INIA 0A
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8006 D1 00 OUTA 00
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8008 18 12 SWI 12
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800A 00 ADD
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800B 00 ADD
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800C 00 ADD
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* H
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finished
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* 8000 26 48 INIA 48
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8002 D1 00 OUTA 00
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8004 26 0A INIA 0A
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8006 D1 00 OUTA 00
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8008 18 12 SWI 12
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800A 00 ADD
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800B 00 ADD
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800C 00 ADD
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* > greet.sbx 210
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hello.sbx 52
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Life.sbx 1411
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Snake.sbx 2175
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Keys.sbx 663
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Say.sbx 155
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Break.sbx 128
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notes.txt 21
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8 files
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> halted
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Execution halted.
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[exit 0]
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