reala-misaki
65112b9305
Verified GVRAM is one word-access per pixel in ALL color modes; chose 256-color 256x192 with movem.l bursts (page 1 sacrificed as double-buffer). Measured 8 scenes from the Blu-ray source: blit costs under 8% of the 12fps cycle budget, so I/O is the bottleneck, not CPU. Naive delta+RLE reaches only 3.2:1 (365 KB/s, 470MB) -> decision to use 4x4 vector quantization (~30 KB/s). "Shot on twos" assumption failed: the transfer has zero duplicate frames, so 12fps requires explicit decimation. Documents three false measurement results and their root causes (per-frame Floyd-Steinberg dithering, temporal denoise, exact-match dedupe on noisy source). MAME Lua injection harness works and is reusable for cycle-cost measurement; the IOCS _B_READ disk benchmark is blocked returning -1. Claude-Session: https://claude.ai/code/session_01194oWYW8DQXK1SZ2DnChW6
35 lines
819 B
ArmAsm
35 lines
819 B
ArmAsm
FLAG = $18000
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RESULT = $18100
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BUF = $20000
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org $10000
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start:
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move.l #1,FLAG.l
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lea RESULT,a2
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moveq #0,d4
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outer:
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move.l d4,d1 ; encoding A: PDA in bits 31-24
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add.l #$80,d1
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swap d1
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lsl.l #8,d1
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bsr.s doread
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move.l d0,(a2)+
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move.l d4,d1 ; encoding B: PDA in bits 15-8
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add.l #$80,d1
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lsl.l #8,d1
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bsr.s doread
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move.l d0,(a2)+
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addq.l #1,d4
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cmpi.l #16,d4
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bne.s outer
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move.l #$FF,FLAG.l
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stop: bra.s stop
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doread:
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movem.l d2-d7/a2-a6,-(sp)
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moveq #$46,d0
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moveq #0,d2
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move.l #256,d3
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lea BUF,a1
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trap #15
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movem.l (sp)+,d2-d7/a2-a6
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rts
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