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

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6309 Board Prototype #1 Specs

HD63C09 CPU @ 3MHz HM62256BLP-7 SRAM AT28C256-15 EEPROM ST16C550 UART @ 1.8342MHz (XO due to lack of 22pf 1.8432MHz XTALs)

Memory Map

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

Truth Table

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