20 Jul
2013
20 Jul
'13
12:03 p.m.
=0A=
As a pedantic point you can't 'subscribe to Datafile', you join HPCC. One
of the benefits of memebrship is Datafile....
Anyway, it should eb possible for you to get the missing issue, I will
look into it for you. I cna send you the missing Part 1 aof the HP9800
series of articles easily, either as LaTeX source aor a Postscript. I am
told the latter can be trivially turned into a .pdf, but I don't have the
software to do it.
I am glad you like them... There were also some
theory-of-operation =0A=
articles for the HP9800 series in the HPCC jorunal over the last couple =
=0A=
of years. But I rather glossed over the power-on
circuitry ans I felt it =
=0A=
was not likely to be much of a problemn. Oh
well...Yes, I actually picked =
up the HPCC DVD to get some of those. =A0I have a
subscription to Datafile,=
but for some reason never received the first 2012 issue. =A0I suppose I ha= ve to wait until the next DVD update. =A0I actually am
much more comforted =
having the schematics, but I like the articles because there is frequently =
It's mentionmed int he artcile you don;'t have (:-)) but I never intended
the articles to replace the schematics. In fact I suggest that to follow
the articles you need the schematics and the microcode source.
I produced the schematics initially as an aid in repairing my HP9830 (and
9810, 9820...) It's really all _I_ needed. But some people got a bit
lost when confronted with a few dozen pages of diagrams so I produced an
explanaition fo the more complex bits like the mremory cotnrol state
machine.
[1] Let me know
if you want a commented source to the 256 word CPU microco=
de.I would be most
grateful for that.=0A= the tape
controlelr boards. So try it now, does it give a prompt at power-=
up.I thought
about that, and tried removing all the tape controller boards =
and, for good measure, all the option ROMs. =A0No change.=0A=