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Lower
Contact
(or
Pin)
Manufacturer
Identifier
Sylvania
6AJrJ7-6-1 A l·rJl
Viking
2KH611AB5
Viking
2KH6/9AB5
Viking
2KH6/21AB5
Amp
53rJ692-1
Sullins
ESM6·SREH
Cinch
25rJ·06-9rJ-170
Table 7.11. A selection of suitable receptacles lor connecting
with the
PET
second cassette edge connector
J3.
MEMORY EXPANSION CONNECTOR lConnector J4)
The memory expansion connector provides access to the buffered and decoded input/output lines from
the 6502 microprocessor. Figure 7.12 shows a simplified view of the 40-position-BO contact edge
connector used. The spacing between contact centers is 0.1 inch.
Note that the 40 top edge "B" connections (or
pi~S)
are ground returns for the corresponding 40 lower
edge "A" connections.
m_{(~mm
InsulatiO( SIDE
B
~
Upper
"'" : : : : : :
-
(o':°;f~;
1
2
3
4
5
6
33 34 35 36 37 38 39 40
SIDE A
Rear or Edge on View through slot in PET
Figure 7.12. Simplified view of edge connector J4 with contact
Identification. All side B contacts grounded.
Table 7.13 shows the PET pin numbers, line labels and fine descriptions.
Side A
Line
Line Description
Pin Numbers
Labels
Al
BA0
Address bit rJ, used for memory expansioll.
Buffered.
A2
BAl
Address bit 1. used for memory expansion.
Buffered.
A3
BA2
Address bit 2, used for memory expansion.
Buffered.
A4
BA3
Address bit 3, used for memory expansion.
Buffered.
A5
BA4
Address bit 4, used for memory expansion.
Buffered.
A6
BA5
Address bit 5, used for memory expansion.
Buffered.
A7
BA6
Address bit 6, used for memory expansion.
Buffered.
AS
BA7
Address bit 7, used for memory expansion.
Buffered.
~
Table 7.13. Memory expansion connector. PET pin numbers.
Line labels and line descriptions.
Table continued on next page.
63
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