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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

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Old 9th Aug 2020, 7:24 pm   #21
Timbucus
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Join Date: Mar 2019
Location: Barry, Vale of Glamorgan, Wales, UK.
Posts: 1,362
Default Re: Orton's rant on serial connection of NIBL computers to modern terminal emulations

Quote:
Originally Posted by Karen O View Post
With the help of another Forum member (again!) I have been able to solve a 44 year old problem!

I've tried to throw some light on a somewhat murky area of NIBL BASIC application, particularly its seemingly undocumented relationship to the ASR 33 teletype.

Enjoy!
Very devious use of those status bits, a bit like the Spectrum ULA holding off the Z80 during screen generation many years later. Minimal systems do seem to bring out the creative juices...
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Old 11th Oct 2020, 4:59 pm   #22
Phil__G
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Join Date: Mar 2011
Location: North Yorkshire, UK.
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Default Re: Orton's rant on serial connection of NIBL computers to modern terminal emulations

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Originally Posted by Karen O View Post
All ECHOED characters have the top bit set! The relevant subroutine 'GECO' (get character and echo it) reads in a typed character and echoes it bit at a time. In other words, it samples each bit of serial input and immediately echoes the bit without waiting for the whole character to come in
geco bit7 stripper:
https://www.vintage-radio.net/forum/....php?p=1294662
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