Table of Contents

IO Board

16 Bit Digital input, 16 Bit Digital Output.

Outputs

16 Relays

Inputs

HP3700

16 socketed Optoisolators, rated for 5 to 240 Volts, AC or DC.

Pinout

Relay boardSignal NamePin#PinSignal Name
GndGround B1 #A1 -I/O CH CKI/O channel check; active low=parity error
A3,B3 on U21RESET DRV B2 #A2 SD7 A1 on U24
+5V+5 V dc B3 #A3 SD6 A2 on U24
n/cIRQ 9 B4 #A4 SD5 A3 on U24
n/c-5 V dc B5 #A5 SD4 A4 on U24
n/cDRQ2 B6 #A6 SD3 A5 on U24
n/c-12 V dc B7 #A7 SD2 A6 on U24
n/c-0WS B8 #A8 SD1 A7 on U24
Connected+12 V dc B9 #A9 SD0 A8 on U24
GndGround B10#A10I/O CH RDYn/c
B2 on U23 - not used-SMEMW B11#A11AEN Address enable; active high when DMA controls bus
B1 on U23 - not used-SMEMR B12#A12SA19 n/c
A3 on U23-IOW B13#A13SA18 n/c
A4 on U23-IOR B14#A14SA17 n/c
n/c-DACK3 B15#A15SA16 n/c
n/cDRQ3 B16#A16SA15 n/c
n/c-DACK1 B17#A17SA14 n/c
n/cDRQ1 B18#A18SA13 n/c
n/c-REFRESH B19#A19SA12 n/c
n/cCLK B20#A20SA11 n/c
n/cIRQ7 B21#A21SA10 n/c
n/cIRQ6 B22#A22SA9 A1 on U23
n/cIRQ5 B23#A23SA8 A2 on U23
n/cIRQ4 B24#A24SA7 B4 on U22
n/cIRQ3 B25#A25SA6 B3 on U22
n/c-DACK2 B26#A26SA5 B2 on U22
n/cTC B27#A27SA4 B1 on U22
n/cBALE B28#A28SA3 A4 on U22
+5V+5 V dc B29#A29SA2 A3 on U22
n/cOSC B30#A30SA1 A2 on U22
GndGround B31#A31SA0 A1 on U22

IC's

LabelChipCountDescription
HP370016Opto-isolator
ULN2803A2driver
U2774HC3741IP/FLOP OCTAL D-TYPE
U17,U28,U35HC3733LATCH OCTAL 3ST D
U16HC3741FLIP FLOP OCT 3ST
U20HC138A1IC DECODER 3-TO-8 LINE
U39HC6881IC COMPARATOR EQUALITY 8B
U22,U23HCT244A2IC BUFF/DVR TRI-ST DUAL
U21HC00A1IC GATE NAND QUAD 2INP
U19HC32A1IC GATE OR QUAD 2INP
U3874HC74AM1F/F W/CLR&SET DUAL D
U2574HC4538M1IC MULTIVIBRATOR DUAL HS
U24HCT245A1IC TRANSCVR 8BIT N-INV
 
projects/electronics/ioboard.txt · Last modified: 2014/11/13 10:50 (external edit)
 
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