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.

[edit] External links

• MOS 6508 datasheet (GIF format, zipped)

65xx-series CPUs from MOS Technology, second source/clone vendors, and the Western Design Center

MOS 4510 ● MOS 6501 ● MOS 6502 ● WDC 65C02 ● Hudson HuC6280 ● Ricoh 2A03 ● MOS 6507 ● MOS 6508 ● MOS 6509 MOS 6510 (and 7501, 8500, 8501) ● MOS 8502 ● MOS 65CE02 ● WDC 65802 ● WDC 65816 ● Ricoh 5A22 ● Nintendo SA-1