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
285 lines
4.0 KiB
NASM
285 lines
4.0 KiB
NASM
; Compare two files without asking either one to fit in Data Memory.
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;
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; Each occupied block is read into its own 256-byte buffer. The byte count returned for
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; the block is compared before its contents, and only those bytes are examined: bytes
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; after the end of a short final block belong to neither file and are allowed to differ.
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;
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; Written by ChatGPT for Anachronaut's SplitBit
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#Include services.asm
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#Program
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#Base 0x5000
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start:
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SETD.0 Arguments
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INIB 0xFF
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SWI osArgument
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SETD.0 Arguments
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LDA.0
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BRA usage
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CALL textSplit
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SETD.0 TextRest
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LDD.0.0
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LDA.0
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BRA usage
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SETD.0 Arguments
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SWI osFileInfo
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BNQ firstFailed
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SETD.0 FirstBlocks
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STD.3.0
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SETD.0 TextRest
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LDD.0.0
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SWI osFileInfo
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BNQ secondFailed
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SETD.0 SecondBlocks
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STD.3.0
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; A different number of occupied blocks is immediately a different file.
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SETD.0 FirstBlocks
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LDA.0
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SETD.1 SecondBlocks
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LDB.1
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CCF
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SUB
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BNQ different
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INCD.0
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INCD.1
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LDA.0
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LDB.1
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CCF
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SUB
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BNQ different
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SETD.0 FirstBlocks
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SETD.1 RemainingBlocks
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CALL copyWord
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RSTA
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SETD.0 Index
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STA.0
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INCD.0
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STA.0
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nextBlock:
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SETD.0 RemainingBlocks
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LDA.0
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INCD.0
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LDB.0
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OR
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BRQ alike
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SETD.0 Arguments
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SETD.1 FirstBlock
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CALL readAtIndex
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BNQ firstReadFailed
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SETD.0 FirstCount
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STD.3.0
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SETD.0 TextRest
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LDD.0.0
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SETD.1 SecondBlock
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CALL readAtIndex
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BNQ secondReadFailed
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SETD.0 SecondCount
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STD.3.0
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; Equal occupied-block counts do not imply equal tails, so compare the valid byte count
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; returned for this block as well.
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SETD.0 FirstCount
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LDA.0
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SETD.1 SecondCount
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LDB.1
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CCF
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SUB
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BNQ different
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INCD.0
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INCD.1
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LDA.0
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LDB.1
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CCF
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SUB
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BNQ different
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SETD.0 FirstCount
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SETD.1 BytesLeft
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CALL copyWord
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SETD.0 FirstBlock
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SETD.1 SecondBlock
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compareByte:
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SETD.2 BytesLeft
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LDA.2
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INCD.2
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LDB.2
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OR
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BRQ blockSame
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LDA.0
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LDB.1
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CCF
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SUB
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BNQ different
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INCD.0
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INCD.1
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SETD.2 BytesLeft
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CALL takeByte
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BRI compareByte
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blockSame:
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CALL stepIndex
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CALL takeBlock
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BRI nextBlock
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; DP0 is the path and DP1 the destination buffer. Q and DP3 are the service answers.
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readAtIndex:
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SETD.2 Index
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LDA.2
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INCD.2
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LDB.2
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SWI osFileBlock
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RET
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; DP0 names the source word and DP1 the destination word.
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copyWord:
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LDA.0
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STA.1
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INCD.0
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INCD.1
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LDA.0
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STA.1
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RET
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stepIndex:
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SETD.0 Index
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INCD.0
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LDA.0
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INCA
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STA.0
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BNC stepDone
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DECD.0
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LDA.0
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INCA
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STA.0
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stepDone:
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RET
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takeBlock:
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SETD.0 RemainingBlocks
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INCD.0
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LDA.0
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BRA blockBorrow
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DECA
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STA.0
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RET
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blockBorrow:
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INIA 0xFF
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STA.0
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DECD.0
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LDA.0
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DECA
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STA.0
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RET
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; Decrement the big-endian sixteen-bit BytesLeft. A full block arrives as 0x0100, so an
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; eight-bit counter would compare none of it and call many different files equal.
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takeByte:
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INCD.2
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LDA.2
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BRA byteBorrow
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DECA
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STA.2
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RET
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byteBorrow:
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INIA 0xFF
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STA.2
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DECD.2
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LDA.2
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DECA
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STA.2
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RET
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alike:
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SETD.0 SameText
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SWI osPrintString
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RSTA
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SWI osExit
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different:
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SETD.0 DifferentText
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SWI osPrintString
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INIA 0d1
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SWI osExit
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usage:
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SETD.0 Usage
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SWI osPrintString
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INIA 0d2
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SWI osExit
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firstFailed:
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SETD.0 FirstError
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SWI osPrintString
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INIA 0d2
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SWI osExit
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secondFailed:
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SETD.0 SecondError
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SWI osPrintString
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INIA 0d2
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SWI osExit
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firstReadFailed:
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SETD.0 FirstReadError
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SWI osPrintString
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INIA 0d2
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SWI osExit
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secondReadFailed:
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SETD.0 SecondReadError
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SWI osPrintString
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INIA 0d2
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SWI osExit
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#Data
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#Base 0x3000
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Arguments:
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#Reserve 0d256
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FirstBlocks:
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0x00 0x00
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SecondBlocks:
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0x00 0x00
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RemainingBlocks:
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0x00 0x00
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Index:
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0x00 0x00
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FirstCount:
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0x00 0x00
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SecondCount:
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0x00 0x00
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BytesLeft:
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0x00 0x00
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FirstBlock:
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#Reserve 0d256
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SecondBlock:
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#Reserve 0d256
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Usage:
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"compare: give me two files
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"
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FirstError:
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"compare: cannot find the first file
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"
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SecondError:
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"compare: cannot find the second file
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"
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FirstReadError:
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"compare: cannot read the first file
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"
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SecondReadError:
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"compare: cannot read the second file
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"
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SameText:
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"the same
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"
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DifferentText:
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"different
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"
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#Include text.asm
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