Tighe
Well-known member
I need one for a Donkey Kong Junior and Galaxian. Which do I need? A Z80, Z80A or Z80B?
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Also since the Z80 is pin compatible with the 8080 could one put a z80 in a Space Invaders? Just curious.
They are not pin compatible... not even close.
You want Z80A for the games mentioned above (Z80B will work as well).
Z80 would be too slow, Z80A will work, and if the code can handle the timing, the Z80B would work as well, if the code doesn't handle timing well, the Z80B could make the game go much much faster.
Z80 would be too slow, Z80A will work, and if the code can handle the timing, the Z80B would work as well, if the code doesn't handle timing well, the Z80B could make the game go much much faster.
The CPU will only go as fast as the board clocks it. So you're not going to see any difference by putting a Z80B in where a Z80A was intended. The MHz rating for the CPU refers to the max clock speed at which it can be reliably run.
Yeah, nothing fancy going on with Z80's.
If I can find them cheap, I usually buy Z80B (or faster). That way I can use them in just about anything.