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Enable CD-ROM via a synchronous fs-backed buffer (#362)

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v86's async loaders leave the ATAPI drive in BSY across an event-loop
turn after a READ(10) CDB. Win95's ESDI_506 reads status twice, sees
BSY both times, and issues DEVICE RESET ~165 instructions later, which
cancels the in-flight read — the drive enumerates but D: never mounts.

Serve the ISO through a small fs.readSync-backed buffer so the data is
available before the next emulated instruction runs, and re-enable the
CD-ROM settings tab.

Also: WIN95_PROBE_CDROM / WIN95_PROBE_CDTRACE harness hooks, and pump
one screen-adapter frame before screenshotting so probe captures work
when the Electron window is occluded.
This commit is contained in:
Felix Rieseberg
2026-04-11 19:31:57 -07:00
committed by GitHub
parent 5da7f94c5a
commit 6e73df11ae
5 changed files with 101 additions and 12 deletions
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.claude/skills/probe-win95/SKILL.md
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@@ -40,6 +40,9 @@ WIN95_SMB_SHARE="$HOME/Downloads" \
desktop. `WIN95_PROBE_DOSBOX=1` instead opens `command`, types `dir`,
and (with `WIN95_PROBE_DOSBOX_ALTENTER=1`) toggles fullscreen — this is
the regression scenario for the windowed-DOS-box VBE leak.
`WIN95_PROBE_CDROM=/path/to.iso` mounts an ISO on the secondary-IDE
ATAPI drive (bypasses the settings UI). `WIN95_PROBE_CDTRACE=1` logs
every secondary-channel ATA/ATAPI command to `/tmp/win95-cdtrace.log`.
`WIN95_PROBE_VGATRACE=1` wraps the VGA I/O ports at the `io.ports[]`
layer and writes `[port, op, value, "eip VMPE cplN"]` tuples to
`/tmp/win95-vgatrace.json` every tick (heavy — can hit 1M entries during