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https://github.com/RetroPortingToolKit/psxrecomp
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Alexandros Mandravillis
26 lines
1.6 KiB
Markdown
26 lines
1.6 KiB
Markdown
# Plain digital command-byte response
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The protocol behavior was checked against the public
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[BizHawk Octoshock gamepad implementation at c9de9a8bff0f](https://github.com/TASEmulators/BizHawk/blob/c9de9a8bff0f95114df7e1d13d4dab820388dc60/psx/octoshock/psx/input/gamepad.cpp).
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It preloads the digital ID after the address byte; an unsupported command
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terminates the reply without another ACK. The command does not retroactively
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replace the ID already shifted out.
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This is a new implementation in the existing
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[upstream SIO state machine](https://github.com/RetroPortingToolKit/psxrecomp/blob/7cddab8237e1f73b7067b8401af602d90a96b80d/runtime/src/sio.c),
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authored by Alexandros Mandravillis (Alexbeav). No emulator implementation,
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reference fixture or retail input is copied. The test's inert link collaborators
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follow the existing upstream DualShock test.
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Only a connected, standalone, non-config-capable digital pad's unsupported-command
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receive byte changes. DTR session lifetime, delayed ACK eligibility, source-specific
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timing, memory cards, analog devices and multitap command policy are excluded.
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The normal 42h poll is unchanged.
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Validation on the current upstream base uses all 256 command bytes on both ports,
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normal button replies, absent devices, config-capable digital/analog exclusions,
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and five/eight-player multitap builds with a positive connected-pad poll. The base fails the 510 unsupported-command
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receive-byte checks; the fixed source passes. Existing DualShock rumble, JogCon
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and NeGcon regressions are also run. These are synthetic protocol checks; no
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game boot, save/load or gameplay qualification is claimed.
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