Re: 16 bit data bus on a 6502.

I actually have a S1D13781 interfaced via a direct 8 bit bus to the w65c265s
MPU. It's a nive chip with integrates 384KB of RAM, and have 2D BitBLT
engine and two layers of graphics.

But the thing with this S1D13513 is that it has all the needed things to
have a very nice 2D graphics chip:

• Multiple window (layer) support
• Mirror and 180° rotation functions
• Alpha blending
• Gamma correction
• Pseudo color expansion
• Hardware cursor support via the sprite engine
• Interrupts available:
  o Maskable non-display (Vsync) interrupt
  o Delayed version of Vsync Interrupt
• 2D BitBLT engine (read, write, move, and fill BLTs)
• 2D sprite engine (up to 16 sprites)
• Unified command FIFO for both BitBLT and sprite

I don't know if those features would reach, equal or surpass that of the
Commodore Amiga, though.

And it do generates its own internal clock outputs for video generation and
SDRAM refresh from the clock input, that can be as low as 5 Mhz. But having
a '816 clocked at 20 Mhz with this chip, would allow to have quite a beast
of 16 bit computer to tinker with.



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