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· Super Moderator
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Discussion Starter · #1 ·
This is a maintenance release to fix a crashing bug in S-DD1 games (Star Ocean, Street Fighter Alpha 2), and a video issue in games using the WAI instruction.

As always, my apologies for any inconvenience. SA-1 support required modification of a large amount of delicate code in the emulation core, and our limited testing team was not able to catch these in time before release.

This release adds full SA-1 support, with no known issues. All 26 games have been tested by myself and others, and a few have been beaten from start to finish. The latter include Super Mario RPG, Kirby's Dreamland 3, Kirby Super Star and Jikkyou Oshaberi Parodius.

Please understand that the SA-1 is essentially four times faster than the SNES' main CPU, so system requirements will be very high for these games. For example, on an E8400 @ 3.0GHz, I average ~160fps in ordinary games. But for SA-1 emulation, this drops to ~90fps, with the worst case being ~80fps.

The following features are emulated:

* 5a22 CPU core (bus-cycle accurate)
* Memory access timing
* SA-1 -> S-CPU interrupts (IRQ + CHDMA IRQ)
* S-CPU -> SA-1 interrupts (IRQ + Timer IRQ + DMA IRQ + NMI)
* SIV / SNV interrupt vector selection
* Timer unit (linear and H/V)
* Super MMC unit (ROM + BW-RAM)
* BS-X flash cart slot mapping
* Normal DMA
* Character-conversion 1 DMA (2bpp + 4bpp + 8bpp)
* Character-conversion 2 DMA (2bpp + 4bpp + 8bpp)
* BW-RAM virtual bitmap mode (2bpp + 4bpp)
* Arithmetic unit (multiplication + division + cumulative sum)
* Variable-length bit processing (fixed and auto increment)

While the following features are not currently emulated, mostly due to lack of information:

* SA-1 bus conflict delays
* Write protection (BW-RAM + I-RAM)
* SA-1 CPU priority for DMA transfers
* DMA access timing
Site @ byuu's homepage

· Registered
10,973 Posts
I downloaded it, thank you very much!
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