MOS Technology 6508
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The MOS Technology 6508 was an 8-bit microprocessor designed by MOS Technology. Based on the popular 6502, the 6508 was augmented with two additional features: an internal 8-bit digital I/O port, and 256 bytes of internal static RAM.
[edit] Memory layout
The internal RAM was mapped into the CPU address space both at $0000-$00FF and at $0100-$01FF, so it could serve as both zero page and stack space. The I/O port was available at location $0001, with a data-direction register at $0000, which was the same layout used on the 6510.
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