Paper Tape Reader PTR 61c
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Paper Tape Reader

Model PTR 61c

Circa October 1966

Power Supply

Tape Motion Motor Control Board & Motor

Photocell Array & Signal Buffer & Data Connector

This antique piece of computer hardware brought to you by

James Larson
Programmer/Analyst Consultant

IBM PC Parallel Port Interface

for General Electric model PTR 61c Paper Tape Reader

The data output swing from 0V to -12V and the tape motion pulses must be negative going. This circuit will shift these signals for the IBM PC Parallel Port. The transistor can be any general purpose switch such as the 2N2222 and the diodes are standard signal types.

Level Shifters for IBM PC Parallel Interface

IBM PC Parallel Port
I/O Address	Bit Number	Name	( I )nput / (O)utput	DB-25 Pin Number
LPTbase+0	0	DATA0	I/O	2
	1	DATA1	I/O	3
	2	DATA2	I/O	4
	3	DATA3	I/O	5
	4	DATA4	I/O	6
	5	DATA5	I/O	7
	6	DATA6	I/O	8
	7	DATA7	I/O	9
LPTbase+1	3	INPUT0 ~Error/Fault	I	15
	4	INPUT1 SLCT (Online)	I	13
	5	INPUT2 Paper Out	I	12
	6	INPUT3 ~Acknowledge	I	10
	7	~BUSY	I	11
LPTbase+2	0	~STROBE	I/O	1
	1	~AUTOFEED	O	14 (Blue/Violet)
	2	RESET	O	16
	3	~SELECT	O	17 (Yellow)
	5	Data Direction Control for LPTbase+0 Register 0=Output 1=Input
Signal Ground		18, 19, 20, 21, 22, 23, 24 and 25

LPTbase I/O Address Printer Port

0x378 LPT1

0x278 LPT2

This circuit design brought to you by

James Larson
Programmer/Analyst Consultant
http://www.dst-corp.com/james
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