A simple 65C02 based computer for fun and learning purpose. A bill of materials and build instructions can be found alongside the roms here
Technical information
The Memo-1 consists on a 65C02 CPU running at 1Mhz, crudely attached to 32K of ram, 16K of rom, and has a 65C22 via and a 6551 ACIA (NOT the W65C51). The system is thought to have 8k of rom available as extension, and to be linked to a Minitel 1b as terminal.
Addresses
High nibble (A15..A12) | Hex range | Selection -----------------------+----------------+----------------- 0000 (0x0) | 0000 - 0FFF | RAM 0001 (0x1) | 1000 - 1FFF | RAM 0010 (0x2) | 2000 - 2FFF | RAM 0011 (0x3) | 3000 - 3FFF | RAM 0100 (0x4) | 4000 - 4FFF | RAM 0101 (0x5) | 5000 - 5FFF | RAM 0110 (0x6) | 6000 - 6FFF | RAM 0111 (0x7) | 7000 - 7FFF | RAM -----------------------+----------------+----------------- 1000 (0x8) | 8000 - 8FFF | VIA 1001 (0x9) | 9000 - 9FFF | ACIA -----------------------+----------------+----------------- 1010 (0xA) | A000 - AFFF | External slot 1011 (0xB)…