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v0.3
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@barbeque barbeque released this 19 Sep 23:47
· 78 commits to master since this release
v0.3
8144866

Soggy v0.3

Many new features added on the base of the v0.2, and some bugs fixed. This was intended to be the first public release, and is recommended for most people.

  • /IORD and /IOWR signals (IORQ + WR/RD) synthesized and passed to cartridge port. This prevented the SF-7000 from working, as did an I/O map collision with the keyboard. Both problems are now fixed.
  • The full 62256 SRAM is wired up, providing 32K of work RAM to the system. The first 8K are accessible without touching the memory management unit; the second 8K can be switched between four "pages." This should allow Sega BASIC and many other titles relying on SC-3000 functions to work. Previous boards had a 2K mod, matching the SC-3000, but this was not tested.
  • An onboard BIOS ROM socket has been added, which runs when a cartridge is not inserted (detected through the "B2" pin on the cartridge slot, which is usually connected to B1 inside cartridges)

Known bugs:

  • /JOY_SEL is not connected to the keyboard edge
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