booting and 11/44 via tu58 sim?
ajp166 at bellatlantic.net
Sun Jun 19 16:18:18 CDT 2005
>Subject: booting and 11/44 via tu58 sim?
> From: Brad Parker <brad at heeltoe.com>
> Date: Sun, 19 Jun 2005 17:05:14 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>On a whim (hey, it's father's day :-) I decided to try and boot my
>dormant 11/44 from the TU58 using the tu58 simulator.
>Has anyone done this?
Functionally it should. last time I did it I used a real tu58
in a lab back at DEC on a reabygosh(tm) 11/44. had to run the
DL port slow.
>I'm being totally lazy and didn't look at the M7090 schematics (yet) and
>assumed the TU58 20pin header is the same as the console 20pin header.
>I also assumed it's RS-232 and not TTL. Further, I assumed it was
>running at 38400 baud.
Both do RS423 (6wire version of RS232, sorta), you will need to
verify hookup but it works.
>Naturally it didn't work right off the bat... :-)
>I know my serial port and tu58 simulator are working since they boot my
>11/730 just fine.
>I'll look at the schematics but I thought I'd ask for any sage advice.
>(luckily my spare UBI board had a DD boot rom on it)
Run slower, the 11/44 the DL port used typically for TU58 is down the
interrupt priority and it can loose data if too fast (overrun).
I'd start at 4800 (known good) and then try 9600 or faster.
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