Teletype (ASR-33) and the PAL-1
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Charles Baetsen
Oct 30, 2022, 12:58:41 PM10/30/22
to PAL 6502 computer
Has anyone tried hooking the PAL-1 upto an ASR-33 yet?
GN Liu
Oct 30, 2022, 9:24:34 PM10/30/22
to PAL 6502 computer
The RS-232 on PAL-1 is modified from KIM-1, so I think you need jump some wires from the PCB for TTY connection.
Best,
Liu
Charles Baetsen
Oct 31, 2022, 4:17:17 PM10/31/22
to PAL 6502 computer
I have a RS-232 to 20 mA current loop converter, so assuming that I can set the baud rate to a 110, it should work.
From: pal...@googlegroups.com <pal...@googlegroups.com> on behalf of Charles Baetsen <va3...@gmail.com>
Sent: Sunday, October 30, 2022, 12:58 p.m.
To: PAL 6502 computer <pal...@googlegroups.com>
Subject: Teletype (ASR-33) and the PAL-1
Sent: Sunday, October 30, 2022, 12:58 p.m.
To: PAL 6502 computer <pal...@googlegroups.com>
Subject: Teletype (ASR-33) and the PAL-1
Has anyone tried hooking the PAL-1 upto an ASR-33 yet?
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Hans Otten
Nov 1, 2022, 9:02:28 AM11/1/22
to PAL 6502 computer
Note the PAL-1 'RS232' levels can present a problem for your RS232 to 20 mA interface.
The '0' RS232 as 5V is OK, the '1' RS232 as 0V may not be low enough, it should be several Volts negative.
Real RS232 levels are +3 V to +15 V or −3 V to −15 V
As it the case for many USB serial adapters.
The '0' RS232 as 5V is OK, the '1' RS232 as 0V may not be low enough, it should be several Volts negative.
Real RS232 levels are +3 V to +15 V or −3 V to −15 V
Speed will not be a problem, the autobaud detection works fine on teletype (1977, last time I had a KIM-1 connected to a ASR33 teletype!).
Hans Otten
Nov 1, 2022, 9:08:51 AM11/1/22
to PAL 6502 computer
File:TTY RS-232 Back.png - TheRetroWagon has a simple circuit, this will work for a PAL-1 I think, 0V is enough.
Hans Van Slooten
Nov 1, 2022, 9:09:01 AM11/1/22
to Hans Otten, PAL 6502 computer
You could probably make a simple MAX232 circuit to adjust the levels properly.
Hans V.
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Hans Otten
Nov 1, 2022, 9:11:52 AM11/1/22
to PAL 6502 computer
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