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50 pin IDC female connector layout
50 pin IDC female connector
at the backplane
This is the expansion but pinout for the Planck 6502 open hardware, extensible retro computer.

 

Pin
Number		 Pin
Name		 Description
1 A0 Processor address bus pin 0
2 D0 Processor data bus pin 0
3 A1 Processor address bus pin 1
4 D1 Processor data bus pin 1
5 A2 Processor address bus pin 2
6 D2 Processor data bus pin 2
7 A3 Processor address bus pin 3
8 D3 Processor data bus pin 3
9 A4 Processor address bus pin 4
10 D4 Processor data bus pin 4
11 A5 Processor address bus pin 5
12 D5 Processor data bus pin 5
13 A6 Processor address bus pin 6
14 D6 Processor data bus pin 6
15 A7 Processor address bus pin 7
16 D7 Processor data bus pin 7
17 A8 Processor address bus pin 8
18 EX0 Extra pin for future use or for communication between expansion cards
19 A9 Processor address bus pin 9
20 EX1 Extra pin for future use or for communication between expansion cards
21 A10 Processor address bus pin 10
22 SLW Used by slow peripherals to request a slower clock speed, active low.
23 GND Ground
24 VCC Positive voltage
25 VCC Positive voltage
26 GND Ground
27 A11 Processor address bus pin 11
28 SS An expansion card is selected. Used by the processor card to disable it's built-in ram and ROM, active low
29 A12 Processor address bus pin 12
30 INH When this is active (low), processor card RAM and ROM are disabled
31 A13 Processor address bus pin 13
32 SEL Used by the backplane to signal to expansion cards when they should activate, active low
33 A14 Processor address bus pin 14
34 L1 Connected to one of the backplane LEDs
35 A15 Processor address bus pin 15
36 L2 Connected to one of the backplane LEDs
37 RDY Processor I/O pin. When low, the processor waits in it's curent state
38 L3 Connected to one of the backplane LEDs
39 BE Processor input pin. when low the processor releases the bus
40 L4 Connected to one of the backplane LEDs
41 CLK Main computer clock. Can be stretched or not depending on the state of the SLOW signal.
42 CLK_12M Stable clock for e.g. VIA timers. Not connected to slot 0
43 R/W CPU read / write pin
44 EX2  Extra signal 2. Not connected to slot 0
45 IRQ  This goes low when an interrupt request has occured, active low
46 EX3 Extra signal 3. Not connected to slot 0
47 SYNC CPU output. Indicates when the CPU is fetching an opcode
48 SIRQ Used by expansion cards to signal an interrupt request to the processor board, active low
49 RST Reset signal trigered by the button on the backplane, active low
50 NMI non maskable interrupt signal trigered by the button on the backplane, active low

 

50 pin IDC male connector layout
50 pin IDC male connector
at the card
Pinout status: +1 -0
According to 1 reports in our database (1 positive and 0 negative) the Planck 6502 expansion bus pinout should be correct.

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Planck 6502 expansion bus visual pinout:click to enlarge
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