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SDD
5ef8712960
The dispatch status is 0x100 (printed as '22' in the message). A driver-side transparent low-RAM write log (VT1200_LOWLOG) shows the slot at bit 0x16F0 is written by the store at 3FDF9090 from a13(0x10), which L3FA7C050 sets to the literal 0x100 when the memory test L3F2018B0 returns non-zero. L3F2018B0 is the level-1 video-memory test (base bit 0x04000000, count 0x20000). Its failing checks: the 16-bit walking-bit read-back at 0x04000000 (baseline, unmapped) and, with video RAM mapped, the REFCNT (0xC00001F0) 'must change' check.
38 lines
1.3 KiB
Lua
38 lines
1.3 KiB
Lua
-- code22_final.lua -- clean evidence capture for CODE22_REPORT.md
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--
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-- Prints, in order: the memory test's loaded args, the walking-bit read vs
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-- expected, the walking-bit failure exit, the DRAM refresh-counter compare,
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-- the memory test's return value, and L3FA7C050's final return.
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--
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-- CFF_FRAMES=300 <mame> vt1200 ... -autoboot_script harness/mame/code22_final.lua
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local machine = manager.machine
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local cpu = machine.devices[':maincpu']
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local dbg = machine.debugger
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if not dbg then print("ERROR: no debugger"); machine:exit(); return end
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local function bp(addr, fmt, regs)
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dbg:command(string.format('bpset %s,,{ printf "%s\\n", %s ; g }', addr, fmt, regs))
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end
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bp("3f201990", "ARGS a13=%08X a7=%08X a3=%08X a4=%08X", "a13, a7, a3, a4")
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bp("3f201c20", "WALK-CMP read=%08X expected=%08X", "a11, a8")
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bp("3f201c80", "WALK-FAIL a12=%08X a8=%08X a11=%08X", "a12, a8, a11")
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bp("3f201ed0", "REFCNT-CMP a0=%08X a6=%08X", "a0, a6")
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bp("3fa7dda0", "MEMTEST-RET a8=%08X", "a8")
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bp("3fa7de30", "C050-RET-0x100 a8=%08X", "a8")
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print("breakpoints armed")
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local maxframes = tonumber(os.getenv("CFF_FRAMES") or "300")
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local n = 0
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emu.register_frame_done(function()
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n = n + 1
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if n >= maxframes then
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print("done (" .. n .. " frames)")
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machine:exit()
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end
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end, "vt1200-cff")
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dbg.visible_cpu = cpu
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dbg.execution_state = 'run'
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