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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.
34 lines
1.4 KiB
Lua
34 lines
1.4 KiB
Lua
-- code22_args.lua
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--
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-- At the memory test L3F2018B0, print the four loaded arguments and, at its
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-- walking-bit failure compare, the pointer a5 and the values involved.
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--
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-- CA_FRAMES=300 <mame> vt1200 ... -autoboot_script harness/mame/code22_args.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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dbg:command('bpset 3f201990,,{ printf "MEMTEST-ARGS a13=%08X a7=%08X a3=%08X a4=%08X a14=%08X\\n", a13, a7, a3, a4, a14 ; g }')
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dbg:command('bpset 3f201ba0,,{ printf "WALK-WRITE a5=%08X a8=%08X\\n", a5, a8 ; g }')
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dbg:command('bpset 3f201c10,,{ printf "WALK-READ a5=%08X a11=%08X expect=%08X\\n", a5, a11, a8 ; g }')
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dbg:command('bpset 3f201c80,,{ printf "WALK-FAIL a5=%08X a12=%08X a8=%08X a11=%08X\\n", a5, a12, a8, a11 ; g }')
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dbg:command('bpset 3f201e60,,{ printf "REFCNT-INIT a0=%08X\\n", a0 ; g }')
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dbg:command('bpset 3f201e90,,{ printf "REFCNT-READ a6=%08X\\n", a6 ; g }')
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dbg:command('bpset 3f201ed0,,{ printf "REFCNT-CMP a0=%08X a6=%08X\\n", a0, a6 ; g }')
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print("breakpoints armed")
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local maxframes = tonumber(os.getenv("CA_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-ca")
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dbg.visible_cpu = cpu
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dbg.execution_state = 'run'
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