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Prototype card PB751-AT provides means for development of custom cards for use in IBM
PC/XT and PC/AT or compatible computers. The card buffers all address lines, data lines,
and some of the control signals. It also provides address decoding for I/O addresses 000
through 3FF hex and for memory addresses 00000 through FF000 and, allows setup of the
selected address block size.
The PB751-AT card provides approximately 35 square inches of breadboard area for custom
circuit development. This breadboard area contains over 2600 plated-through holes for easy
component soldering. The holes are 0.035" in diameter with 0.100" spacing. The breadboard
area is surrounded by heavy buses for ground and +5VDC power.
The card is supplied with a 37-pin sub-D right angle connector and matching mounting
bracket. The properly spaced holes at the right end of the card will accommodate either one
37-pin sub-D connector, or one 25-pin and one 9-pin sub-D connector, or one 40, 50, or 60 pin
flat cable connector.
PC BUS PIN CONNECTIONS AND SIGNAL LIST
62-PIN CONNECTOR
Bracket End of Card
Ground
Reset
<
+5VDC
IRQ2
-5VDC
DRQ1
-12VDC
-OWS
+12VDC
S
Ground
O
-SMEMW
<
L
-SMEMR
<
D
-IOW
<
E
-IOR
<
R
-DACK3
<
DRQ3
S
-DACK1
<
I
DRQ1
D
-REFRESH <
E
CLK
<
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
-DACK2
T/C
<
BALE
<
+5VDC
OSC
Ground
MANUAL 00650-100-10
CHAPTER 2
FUNCTIONAL DESCRIPTION
B1
A1
<
-IOCHCK
B2
A2
<>
SD7
B3
A3
<>
SD6
>
B4
A4
<>
SD5
B5
A5
<>
SD4
>
B6
A6
<>
SD3
B7
A7
<>
SD2
>
B8
A8
<>
SD1
B9
A9
<>
SD0
B10
A10
<
IO CH RDY
B11
A11
<
AEN
B12
A12
<>
SA19
B13
A13
<>
SA18
B14
A14
<>
SA17
B15
A15
<>
SA16
>
B16
A16
<>
SA15
B17
A17
<>
SA14
>
B18
A18
<>
SA13
B19
A19
<>
SA12
B20
A20
<>
SA11
>
B21
A21
<>
SA10
>
B22
A22
<>
SA9
>
B23
A23
<>
SA8
>
B24
A24
<>
SA7
>
B25
A25
<>
SA6
>
B26
A26
<>
SA5
B27
A27
<>
SA4
B28
A28
<>
SA3
B29
A29
<>
SA2
B30
A30
<>
SA1
B31
A31
<>
SA0
C
O
M
P
O
N
E
N
T
S
I
D
E
Page 3
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