I/O Map
The following table lists the main I/O definitions of the COMX-35 and some additional HW. Note that I/O would off course only work if specified HW is connected.
| Q | - First pulse enables DRAM Refresh and interrupt - Cassette Out |
| EF1 | Display / Non display period |
| EF2 | - On power up 1=PAL, 2=NTSC - After Q pulse, Keyboard RPT |
| EF3 | Keyboard DA |
| EF4 | - Cassette In - Disk DRQ - Thermal Printer Flag - 80 Column Retrace |
| OUT 1 | Select Bank b1: Expansion slot 1 (#02)b2: Expansion slot 2 (#04) b3: Expansion slot 3 (#08) b4: Expansion slot 4 (#10) b5/b6: 32K RAM bank b5/b7: F&M EPROM bank |
| OUT 2 | Reserved for expansion card |
| OUT 3-7 | 1870 OUT 3 to 7 |
| INP 2 | Reserved for expansion card |
| INP 3 | 1871 Keyboard input |