Schematic legend:
All resistors without a value represent an option, usually it's an SMD variation of a "jumper", so you can short it by wire or use the resistor with 0 Ohm value
Power options:
| Part | Behaviour |
|---|---|
| RW1 | 5V external power supply on leftmost pin of a floppy connector |
| RW2 | Unkown voltage on +5V pin on leftmost pin of a floppy connector |
| NC | Arduino power plug will be used instead of floppy connector |
OLED display options:
| Part | Behaviour |
|---|---|
| RO1 | 3V3 Power |
| RO2 | 5V Power |
| RO3 + RO4 | pinout: GND, Vcc, SDA, SCL (default for most displays) |
| RO5 + RO6 | pinout: Vcc, GND, SDA, SCL |
Drive select and motor on options:
| Part | Behaviour |
|---|---|
| R10 - R16 | Connect D5 pin to respective input from FDC side |
| R110 - R116 | Connect D4 pin to respective input from FDC side |
Default PC config (crossed cable):
- single drive R12 + R116
- dual drive: R12 + R114
Default Shugart config (straight cable):
- single drive R10 + R116
- dual drive: R10 + R112
FDC Grounding:
| Part | Behaviour |
|---|---|
| RG1 | If short GND on pins 1-3, 7-33, if NC then GND on 21-33 pins only |
Serial options:
| Part | Behaviour |
|---|---|
| RX1 | RxD input resistor |
| RX2 | RxD pull-down resistor (only if voltage divider is used) or ESD can be used if desired |
| RT1 | TxD output resistor - usually short |
| RT2 | TxD pull-down resistor - usually NC |
Additional notes:
- RPx resistors are 1k pullups
- Push button S1 is put to the side of the board and can be omitted, as not really needed by firmware
- SD module connector is split because of the stacked config of multiple interconnected PCBs,
/CSsignal must be connected with additional wire - PCB in prototype stage! Not tested yet
