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https://git.k-space.ee/arti/vt1200.git
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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.
46 lines
1.4 KiB
Lua
46 lines
1.4 KiB
Lua
-- code22_fail.lua
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--
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-- L3FA7C050 returns code 0x100 (-> VIDEO MEMORY-22) when the memory test
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-- L3F2018B0 returns nonzero. Find which failure branch inside L3F2018B0 is
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-- taken by breaking on each of its error exits.
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--
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-- CF_FRAMES=300 <mame> vt1200 ... -autoboot_script harness/mame/code22_fail.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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-- address -> literal label (embedded in the printf, no %s)
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local targets = {
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{ "3f201c80", "WALKING-BIT-MISMATCH" },
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{ "3f207080", "HANDLER-3F207080-a2eqa0" },
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{ "3f2064c0", "HANDLER-3F2064C0-a2nea0" },
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{ "3f2070c0", "HANDLER-3F2070C0-REFCNT-eq" },
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{ "3f207050", "HANDLER-3F207050-a1eqa0" },
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{ "3f207180", "HANDLER-3F207180-a2nea0-2" },
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{ "3f206910", "HANDLER-3F206910-a1nea0" },
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{ "3f207200", "HANDLER-3F207200-walkerr" },
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{ "3f2073d0", "HANDLER-3F2073D0-spne0" },
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{ "3fa7de30", "L3FA7C050-RET-0x100" },
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}
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for _, t in ipairs(targets) do
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dbg:command(string.format(
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'bpset %s,,{ printf "%s pc=%%08X a8=%%08X a9=%%08X a11=%%08X\\n", pc, a8, a9, a11 ; g }',
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t[1], t[2]))
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end
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print("breakpoints armed: " .. #targets)
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local maxframes = tonumber(os.getenv("CF_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-cf")
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dbg.visible_cpu = cpu
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dbg.execution_state = 'run'
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