Wednesday, July 4, 2018

Continued work restoring the ASR 33 printer unit

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TELETYPE ASR 33 PRINT UNIT RENOVATION After clearing some sticky residue on the code bars and selector mechanism, I discovered that a sp...
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Monday, July 2, 2018

Printing unit of ASR 33 in fairly good shape after cleaning and lubrication; built RS232 to current loop adapter

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WORK ON MODEL 33 PRINTER UNIT A teletype uses a current loop where a current (20ma or 60ma) is called a MARK and the absence of current ...
Saturday, June 30, 2018

Good progress with model 15/19 teletypes, plus restoration work on IBM 1401 card reader

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IBM 1401 SYSTEM CARD READER REPAIR Our German 1401 system has been down for weeks because its card reader (1402) is unable to read cards...
Monday, June 25, 2018

Worked out ASR33 modification, USB to TTY module working fine

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ASR 33 TELETYPE RELAY BOARD UNDERSTOOD AND MODIFICATION DESIGNED I learned more about that mystery board with the reed relay inside my ASR...
Sunday, June 24, 2018

Good progress on the USB to teletype interface debugging, plus restoration work on TTY 15 and ASR33

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DEBUGGING USB TO TELETYPE PROJECT I received two items last night, an alternative CP2102 USB module and a new USB cable. The replacement...
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Thursday, June 21, 2018

Mainly debugging the CP2102 breakout boards, while the project itself seems to be functional

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USB TO TELETYPE INTERFACE DEBUGGING I received my replacement USB board (CP2102 board specified by the designer of the interface), plugge...
Tuesday, June 19, 2018

Cleaning up board, identifying bad USB module

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DEBUGGING THE USB TO TELETYPE INTERFACE To rule out a problem with my USB daughtercard I ordered another and expect to have it by Thursd...