AnachronautandClaude Opus 5
3449405b18
CosmOS had 1,161 bytes of Program Memory left before the address applications load at, and Tab completion is not going to fit in that with anything to spare. So the wall moves up one page: the system keeps below 0x4FFF and 0x2FFF, and an application is based at 0x5000 and 0x3000. A PAGE IS A CHEAP THING TO GIVE IT AND AN EXPENSIVE THING TO RUN OUT OF. An application still has 44K of Program Memory before the vector table and the largest one here uses 7.5K, so what was taken from applications is space nothing has ever asked for - while what the system gained is the difference between building the next thing and counting bytes while building it. Not doubling, which was the version that would have cost application space worth minding. One page, and the same again when it is needed. Nothing in the machine knows where the wall is, so this is 34 #Base lines, one threshold in the fault handler, and the table in the CosmOS README that Tests/docs.sh reads its limits out of. The native assembler's scratch map had to move with it, and docs.sh said so before anything ran: its data reached 0x40D6 and its buffers began at 0x4000, so they were sitting on its variables. That file already carries a paragraph about the floor coming up and the map staying where it was. It has happened twice now, and been caught by a check the first time wrote. Twenty three recordings are the same runs a page higher. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW
63 lines
1.6 KiB
NASM
63 lines
1.6 KiB
NASM
; A program for CosmOS to load and run.
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;
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; It carries no library of its own and no vector table. Everything it can do it asks the
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; system for, by name, through services.asm, which the system includes too. The order of
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; the names in that one file is what gives them their numbers, so neither side has a
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; number written down anywhere and the two cannot disagree about them.
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;
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; Compare it with Programs/loadable/hello.asm, which is the same idea one step earlier:
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; that one talks to the console port itself and stops with HALT, because when it was
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; written there was no system to ask and nowhere to give the machine back to.
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;
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; It is assembled for where it will live. #Base says so, and that makes the assembler
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; write it out as a loadable program rather than as a boot image. Nothing relocates
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; anything, so those addresses have to be the ones CosmOS puts it at.
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#Include services.asm
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#Program
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#Base 0x5000 ; Above the system, which keeps below here.
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greet:
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SETD.0 Opening
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SWI osPrintString
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SETD.0 Question
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SWI osPrintString
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SETD.0 Answer
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INIB 0d31
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SWI osReadLine
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SETD.0 Hello
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SWI osPrintString
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SETD.0 Answer
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SWI osPrintString
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SETD.0 Ending
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SWI osPrintString
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; Give the machine back. The system takes its Stack back at this point, so everything
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; this program pushed goes with it.
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RSTA
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SWI osExit
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#Data
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#Base 0x3000 ; And its data above the system's.
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Opening:
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"a program, loaded off a disk, running on the system that loaded it
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"
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Question:
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"what should I call you? "
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Hello:
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"hello, "
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Ending:
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". that is all I do.
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"
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; Thirty one characters and the zero byte that ends them.
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Answer:
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#Reserve 0d32
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