AnachronautandClaude Opus 5
ccf4b384e1
Five .asm files sat at the top of Programs/ beside six directories, with
nothing to say which a new file should join - and hello.asm, which is the
native assembler's first target and named in sixteen places, looked like a
stray.
Programs/
Examples/ what you read to learn: hello, printHello, inputTest,
replCalculator, and Fibonacci, primeSieve and gameOfLife
as sets of their own
Libraries/ included by name, no entry point of their own
Loader/ loader.asm, and the loadable program it reads
CosmOS/ the system, its applications and its assembler
testPrograms/ what 'make test' drives
Loader/ is the one worth explaining. loader.asm is not a demonstration: it
reads a program off a disk, puts the two pieces where the header asks, and
jumps to the entry. CosmOS grew out of it and does the same thing as one of
its commands. It is kept because backward compatibility with the simplest
version of the system is a standing goal, and it was sitting loose next to
the demos as though it were one.
Programs/loadable/ was a directory holding one file called hello.asm - a
third thing of that name, and the name said nothing about why it was there.
It is Loader/loadable.asm now, beside the loader that reads it.
Every reference moved with them: the makefile's program list, twelve
manifest lines, makedisks.sh, native.sh, and four paths across the README
and both manuals. Verified by deleting both build directories and running
the whole suite from nothing.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW
267 lines
3.4 KiB
NASM
267 lines
3.4 KiB
NASM
; Conway's Game of Life rewritten for SplitBit's four-Data-Pointer ISA.
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;
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; The representation and display match 16x16Life.asm: a visible 16x16 field,
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; a dead border, and interleaved current/next bytes. DP0 walks the board, DP1
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; and DP2 address the loop counters, and volatile DP3 walks the neighborhood.
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#Include print.asm
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#Program
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start:
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CALL seedGlider
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SETD.0 ClearScreen
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CALL printString
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generationLoop:
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CALL renderBoard
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CALL evolveBoard
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CALL commitBoard
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CALL frameDelay
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BRI generationLoop
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seedGlider:
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SETD.0 Board
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DPUP.0 0d42
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INIA 0x01
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STA.0
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SETD.0 Board
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DPUP.0 0d80
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STA.0
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SETD.0 Board
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DPUP.0 0d112
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STA.0
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DPUP.0 0d02
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STA.0
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DPUP.0 0d02
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STA.0
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RET
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renderBoard:
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SETD.0 CursorHome
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CALL printString
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SETD.1 RowCount
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SETD.2 ColCount
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INIA 0d16
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STA.1
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SETD.0 Board
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DPUP.0 0d38
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renderRow:
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INIA 0d16
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STA.2
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renderCell:
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LDA.0
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BRA renderDead
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INIB 0x23
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OUTB 0x00
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BRI renderCellDone
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renderDead:
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INIB 0x20
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OUTB 0x00
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renderCellDone:
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DPUP.0 0d02
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LDA.2
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DECA
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STA.2
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BRA renderRowDone
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BRI renderCell
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renderRowDone:
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CALL lineFeed
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DPUP.0 0d04
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LDA.1
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DECA
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STA.1
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BRA renderDone
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BRI renderRow
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renderDone:
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RET
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evolveBoard:
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SETD.1 RowCount
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SETD.2 ColCount
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INIA 0d16
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STA.1
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SETD.0 Board
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DPUP.0 0d38
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evolveRow:
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INIA 0d16
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STA.2
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evolveCellLoop:
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CALL evolveCell
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DPUP.0 0d02
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LDA.2
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DECA
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STA.2
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BRA evolveRowDone
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BRI evolveCellLoop
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evolveRowDone:
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DPUP.0 0d04
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LDA.1
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DECA
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STA.1
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BRA evolveDone
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BRI evolveRow
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evolveDone:
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RET
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evolveCell:
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CALL countNeighbors
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MVQB ; B is the neighbor count from here down.
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; Three neighbors always produces a live cell.
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INIA 0d03
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CCF
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SUB
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BRQ makeAlive
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; Two neighbors preserve the current state.
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INIA 0d02
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CCF
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SUB
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BRQ preserveCell
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makeDead:
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RSTA
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INCD.0
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STA.0
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DECD.0
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RET
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preserveCell:
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LDA.0
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BRA makeDead
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makeAlive:
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INIA 0x01
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INCD.0
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STA.0
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DECD.0
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RET
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; Return the eight-neighbor sum in Q. One Stack round-trip copies DP0 into
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; volatile DP3; MVQA then keeps the running total entirely in registers.
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countNeighbors:
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PSHD.0
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POPD.3
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RSTA
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DPDN.3 0d38
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LDB.3
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CCF
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ADD
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MVQA
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DPUP.3 0d02
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LDB.3
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CCF
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ADD
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MVQA
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DPUP.3 0d02
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LDB.3
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CCF
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ADD
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MVQA
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DPUP.3 0d32
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LDB.3
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CCF
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ADD
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MVQA
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DPUP.3 0d04
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LDB.3
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CCF
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ADD
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MVQA
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DPUP.3 0d32
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LDB.3
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CCF
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ADD
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MVQA
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DPUP.3 0d02
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LDB.3
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CCF
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ADD
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MVQA
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DPUP.3 0d02
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LDB.3
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CCF
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ADD
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RET
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commitBoard:
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SETD.1 RowCount
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SETD.2 ColCount
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INIA 0d18
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STA.1
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SETD.0 Board
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commitRow:
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INIA 0d18
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STA.2
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commitCell:
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INCD.0
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LDA.0
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DECD.0
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STA.0
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DPUP.0 0d02
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LDA.2
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DECA
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STA.2
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BRA commitRowDone
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BRI commitCell
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commitRowDone:
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LDA.1
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DECA
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STA.1
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BRA commitDone
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BRI commitRow
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commitDone:
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RET
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frameDelay:
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INIA 0xFF
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delayOuter:
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INIB 0xFF
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delayInner:
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DECB
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BRB delayInnerDone
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BRI delayInner
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delayInnerDone:
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DECA
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BRA delayDone
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BRI delayOuter
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delayDone:
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RET
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#Data
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RowCount:
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0x00
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ColCount:
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0x00
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ClearScreen:
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0x1B
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"[2J"
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CursorHome:
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0x1B
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"[H"
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; 18 by 18 cells with the current and next states interleaved, so 648 bytes. The
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; original leaves this implicit and leans on Data Memory being zero, which works but
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; means the assembler believes the board is one byte long: anything placed after it
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; would land inside it, and nothing would say so. Reserving the region states how far
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; it reaches, so a label added below here is safe.
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Board:
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#Reserve 0d648
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