amberisvibin/chibi-pc09
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chibi-pc09/docs/prototype-1-specs.md

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6309 Board Prototype #1 Specs

HD63C09 CPU @ 3MHz AS6C62256-55 SRAM (32KB) SST39SF010A-70 FLASH (32KB Used) PC16550 UART @ 1.8342MHz

Memory Map

Device Location
FLASH 8000-FFFF
UART 7F00-7FFF
SRAM 0000-7EFF

Truth Table

A15 A14-A9 A8 Chip
H x x FLASH
L x L SRAM
L H H UART