> The 7800 dev kit has 13 chips on it as follows:
>
> * 5 RAM chips (SONY 8A16 CXK58256PM-12) (16K each?)
> * 1 HD468B21P / HD688B21P (microcontroller?)
> * 1 EPROM
> * 5 74LS??? chips
> * 1 PAL16K8ANC
I got a chance to borrow one of these boards this weekend and am in the process of tracing out the circuit and drawing up schematics for it. The HD468B21, (it's a 65SC21 on the one I have) is a PIA chip. The RAM chips are actually 32K. It appears that the code from the EPROM is run by the 7800 like a normal cartridge. This code loads your programs to the RAM from the ST's parallel port VIA the 6821 PIA.
Dan Boris
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