Backplane

What is it?

A simple backplane PCB allowing up to 5 PCBs to share the Data and Address lines of the HobbyPCB 65C02 SBC. It has the same 36-pin pinout as the SBC, Floppy IF board, and VDU board, so all boards connect easily to each other.

The backplane includes provision for:

• Reset push-button — useful when the SBC's own reset is obscured by expansion boards
• On/off switch
• Space for an RS232 Dongle
• 5V PSU connector

Why did I make it?

To be honest, I got fed up with having lots of Dupont cables all over the place!

What makes it special?

PCBs can be plugged in to any slot — there is no fixed position. Each board picks up the Address, Data and Control Bus as needed, so the system is completely flexible.

36-Pin Bus Connector

Left to right: D7 D6 D5 D4 D3 D2 D1 D0 A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 CPUCLK PHI2 CPURW CPURESET RAMRW ROMOE ACIACLK /2MHZCLK GND RX TX 5V

Schematics & Images