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C16/+4 Expansion Bus

Availble on Commodore C16 and +4 computers.

UNKNOWN (At the Computer)

UNKNOWN CONNECTOR at the Computer.

Pin Name Description
1 GND Ground
2 +5V +5 VDC
3 +5V +5 VDC
4 /IRQ Interrupt
5 R/W Read/Write
6 C1HIGH External Cartridge Chip Selects C1 High
7 C2LOW External Cartridge Chip Selects C2 Low (reserved)
8 C2HIGH External Cartridge Chip Selects C2 High (reserved)
9 /CS1 Chip Select 1 ?
10 /CS0 Chip Select 2 ?
11 /CAS Column Address Strobe
12 MUX DRAM address multiplex control signal
13 BA Bus Availble (Low=DMA)
14 D7 Data 7
15 D6 Data 6
16 D5 Data 5
17 D4 Data 4
18 D3 Data 3
19 D2 Data 2
20 D1 Data 1
21 D0 Data 0
22 AEC ?
23 EAI External Audio In
24 PHI 2 Artificial Phi 2 signal
25 GND Ground
A GND Ground
B C1LOW External Cartridge Chip Selects C1 Low
C /BRESET ?
D /RAS Row Address Strobe
E PHI 0 ?
F A15 Address 15
G A14 Address 14
H A13 Address 13
I A12 Address 12
J A11 Address 11
K A10 Address 10
L A9 Address 9
M A8 Address 8
N A7 Address 7
O A6 Address 6
P A5 Address 5
Q A4 Address 4
R A3 Address 3
S A2 Address 2
T A1 Address 1
U A0 Address 0
V n/c Not connected
W n/c Not connected
X n/c Not connected
Y GND Ground

PHI 2: Address valid on the rising edge, data valid on the falling edge

Contributor: Joakim �gren
Source: Usenet posting in comp.sys.cbm, Pinout specs fort cbm machines needed by Lonnie McClure
Please send any comments to Joakim �gren.