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R64CNT is a free-running 7-bit counter incremented at 128 Hz (bit 0 is the 64 Hz bit, bit 6 the 1 Hz bit). It was registered read-only with no handler, so it always read 0. Code that waits for it to change, such as a BIOS boot delay loop, never exits. Derive it from the SH4 cycle count so it advances in emulated time, at the same rate as MAME's SH4 RTC. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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R64CNT is a free-running 7-bit counter incremented at 128 Hz (bit 0 is
the 64 Hz bit, bit 6 the 1 Hz bit). It was registered read-only with no
handler, so it always read 0. Code that waits for it to change, such as
a BIOS boot delay loop, never exits.
Derive it from the SH4 cycle count so it advances in emulated time, at
the same rate as MAME's SH4 RTC.
Testing: compiles in the libretro core and the standalone build (macOS arm64). Not run on content.
🤖 Generated with Claude Code