4 Oct
1999
4 Oct
'99
8:09 a.m.
--- allisonp(a)world.std.com wrote:
I was assuming a sinusoidal AB-AB chain starting from the slots labelled
"A" and "B" (out of A, B, C, and D). Now... the one twist is that the
cards
are installed with the CPU facing the bottom of the cage (solder side up),
but the keys on the backplane connectors are a dead giveaway.
The fact that
the machine hangs solid when the card is where it's
supposed to be may be a clue that the it's permanently stuck interrupting.
Depending on backplane the grant may not end-up where you guess it is. My memory is fuzzy on this but I think Ht-11 (heath
os) did not like RTC
<line event> interrupt and would hang on that.
Hmm... I don't have any HT-11 disks, only RT-11. But the LTC *was* enabled.
Yes, also DLV11 or the heath serial card both should
have HALT on BREAK
enabled. <both support it as do the 11/03>
I didn't even try that. For now, because of bootstrap considerations, I'm
running with an 11/23plus CPU and a VT-220 (because it's close).
Speaking of bootstraps, what did the H-11 come with stock? BDV-11? Custom
Heath board?
-ethan
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4 Oct
4 Oct
8:35 a.m.
I was assuming a sinusoidal AB-AB chain starting from
the slots labelled
"A" and "B" (out of A, B, C, and D). Now... the one twist is that
the cards
are installed with the CPU facing the bottom of the cage (solder side up),
but the keys on the backplane connectors are a dead giveaway.
Heath backplane is serpentine AB only.
Yes, also
DLV11 or the heath serial card both should have HALT on BREAK
enabled. <both support it as do the 11/03>
I didn't even try that. For now, because of bootstrap considerations, I'm
running with an 11/23plus CPU and a VT-220 (because it's close). Speaking of bootstraps, what did the H-11 come with
stock? BDV-11? Custom
Heath board?
No BDV11, that was a dec card. I remember a hand entered ODT boot. You
could use a BDV11 or TEV11. The last time I used a real H11 running H27
and HT11 was 1981.
Allison
12:28 p.m.
Allison wrote:
No BDV11, that was a dec card. I remember a hand
entered ODT boot. You
could use a BDV11 or TEV11. The last time I used a real H11 running H27
and HT11 was 1981.
The Heath floppy interface card has a boot ROM. When this card is installed
you get a $ prompt (instead of the @ odt prompt). Typing "DX" to this
prompt boots from the drive.
--Chuck
9211
days inactive
9211
days old
2 comments
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allisonp＠world.std.com -
cmcmanis＠mcmanis.com -
ethan_dicks＠yahoo.com