Galactic Expansion Board
When I got a SYM-1 again, I needed to add ROMs, RAM and it would be nice to have the 1541 DOS finally operational (I had...

C, Basic, RAE on the SYM-1
Wayne Parham of Parhamdata has an interesting page on his VIM-1 and SYM-1 systems. He has written some interesting pa...

SYM-1 Memory Allocation
The SYM-1 had a comprehensive expansion strategy with both I/O (3 6522 PIAs and a 6532 RIOT) and memory. The board was s...

SYM-1 Memory Expansion
Memory was expensive in the days when the SYM-1 was released. The boards were shipped with 1kB of RAM (2 "2114" of 4bits...