The Z85C30 or Z85230 modules for RCBus enable the use of the Z80 processor's IM2 vector interrupt chain and DMA channels for transmission. The module allows the use of SCC chips in DIP40 or PLCC44 packages.
| Position | Description |
|---|---|
| open | disable |
| close | enable |
External power supply and USB cannot be used at the same time!
| Position | Description |
|---|---|
| open | disable |
| close | enable |
External power supply and USB cannot be used at the same time!
| Position | Description |
|---|---|
| 1-2 | SCC address: 0x80 |
| 2-3 (default) | SCC address: 0xA0 |
| Position | Description |
|---|---|
| 1-3 & 2-4 | Bus: Serial 1 |
| 3-5 & 4-6 | Bus: Serial 2 |
| 1-3 & 2-4 5-7 & 6-8 |
Bus: Serial 1 with CTS/RTS signal |
Connect to USB-to-serial converter.
Connect to USB-to-serial converter.
| Component type | Reference | Description | Quantity |
|---|---|---|---|
| PCB | (E)SCC PCB - Version 2.2 | 1 | |
| Integrated Circuit | U1 or U7 | Z85C30 or Z85230, DIP40 or PLCC44 | 1 |
| Integrated Circuit | U2 | 74HCT138 - 3-to-8 line decoder, 16 pin DIP | 1 |
| Integrated Circuit | U3 | 74HCT164 - 8-bit serial-in/parallel-out shift register, 14 pin DIP | 1 |
| Integrated Circuit | U4 | 74HCT11 - Triple 3-input AND gate, 14 pin DIP | 1 |
| Integrated Circuit | U5 | 74HCT04 - Hex Inverters, 14 pin DIP | 1 |
| Diode | D1 | Small signal Schottky diodes BAT46, DO35 | 1 |
| Connector | S1 | 2x40 pin header, 2.54 mm pitch, angle | 1 |
| Connector | P1,P2 | 6 pin header, 2.54 mm pitch, angle | 2 |
| Pin Header | JP1,JP2 | 2 pin header, 2.54 mm pitch | 2 |
| Pin Header | JP3 | 3 pin header, 2.54 mm pitch | 1 |
| Pin Header | JP4 | 2x4 pin header, 2.54 mm pitch | 1 |
| Capacitor | C1 - C5 | 0.1 uF, 50V, MLCC, 2.5 mm pitch | 5 |
| Resistor | R1,R6,R7,R12 | 100 kohm, 0.25 W, axial | 4 |
| Resistor | R2-R5,R8-R11 | 2.2 kohm, 0.25 W, axial | 8 |
| Resistor | R13 | 10 kohm, 0.25 W, axial | 1 |
| IC Socket | U1 or U7 | 40 pin DIP or 44 pin PLCC | 1 |
| IC Socket | U2 | 16 pin DIP | 1 |
| IC Socket | U3 - U5 | 14 pin DIP | 3 |
Gerber files prepared for production at JLCPCB
-
Version 2.2
- Initial version
Copyright 2025 Tadeusz Pycio
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) .