2 May
2023
2 May
'23
12:11 a.m.
“soldering iron…”
i do remember the fun of changing the baud rate of an async line on the Honeywell level 66
mainframe at college. This required shutting the whole machine down, removing one of the
cards, and the (very careful) use of a wire wrap tool.
-Steve
2 May
2 May
7:15 a.m.
New subject: UNIX "Machine Layer"
I believe the async lines were connected to I/O boards in the Front End Processor, AKA the
Datanet 66xx. I don't recall having to change baud rates that way but we did have to
do periodic FCOs (field change orders) which required wiring changes and occasional chip
changes to correct bugs. I've still got my hand wire wrap tool somewhere but it
hasn't been used in at least 30 years.
- Rod
On May 1, 2023, at 2:12 PM, Steve Simon
<steve(a)quintile.net> wrote:
“soldering iron…”
i do remember the fun of changing the baud rate of an async line on the Honeywell level
66 mainframe at college. This required shutting the whole machine down, removing one of
the cards, and the (very careful) use of a wire wrap tool.
-Steve
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Roderick Bartlett -
Steve Simon