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new datasheets, sch work, memory map

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Amber
2024-10-24 09:41:24 -04:00
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docs/prototype-1-specs.md Normal file
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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 |