CommodoreVic 20 Memory Expansion connector pinout

#Computer#Memory cards

Available on Commodore Vic 20 computers. On the left side.

UNKNOWN connector  at the computer 1 TOP 22 +——————-//—————-+ | =================//================ | +—————–//——————+ A BOTTOM Z

PinNameDescription
AGNDGround
BCA0Address 0
CCA1Address 1
DCA2Address 2
ECA3Address 3
FCA4Address 4
HCA5Address 5
JCA6Address 6
KCA7Address 7
LCA8Address 8
MCA9Address 9
NCA10Address 10
PCA11Address 11
RCA12Address 12
SCA13Address 13
TI/O 2Decoded I/O block 2, starting at $9130
UI/O 3Decoded I/O block 3, starting at $9140
VS02Phase 2 System Clock
W/NMINon maskable Interrupt
X/RESET6502 Reset
Yn/cNot connected
ZGNDGround
1GNDGround
2CD0Data 0
3CD1Data 1
4CD2Data 2
5CD3Data 3
6CD4Data 4
7CD5Data 5
8CD6Data 6
9CD7Data 7
10/BLK 1BLK 1 (Memory location $2000 - $3fff)
11/BLK 2BLK 2 (Memory location $4000 - $5fff)
12/BLK 3BLK 3 (Memory location $6000 - $7fff)
13/BLK 5BLK 5 (Memory location $a000 - $bfff)
14RAM 1RAM 1 (Memory location $0400 - $07ff)
15RAM 2RAM 2 (Memory location $0800 - $0bff)
16RAM 3RAM 3 (Memory location $0c00 - $0fff)
17V R/WRead/Write from Vic chip (1=R, 0=W)
18C R/WRead/Write from CPU (1=R, 0=W)
19/IRQ6502 Interrupt Request
20n/cNot connected
21+5V+5 VDC
22GNDGround

Commodore 64 / 128 User I/O pinout

Communication and Networking Riser (CNR) pinout