22 Jun
2009
22 Jun
'09
1:38 p.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] Namens Tony Duell
Verzonden: maandag 22 juni 2009 22:04
Aan: cctalk at classiccmp.org
Onderwerp: Re: How to lose most of an an entire collection in one shot
Is it for the Graphic coprocessor ?
That's an external unit you place next to the system unit, it connects to
somekind of bus extender board with a flatcable.
> I am sure yuo realise why I prefer the
series 200 to the series
> 300...
> Perhaps I am being unkind -- the only 9000/300 machine I'ev been
> inside is the model 340, and it seemed to be stuffed with
> unrecognisable PGA-packaged ICs. At least the series 200s
are mostly
> standard parts with the odd PAL, ROM and
microcontroller
thrown in.
The processor and memory boards of the 350/360 are build
from TTL and
PAL's(lots of them)
Right... As I said, I've only been inside the 9000/340 (I
have a number of those that I was given, all with high-res
video boards, and IIRC, 16M RAM.). Somewhere I have an
interface board for an external video box, the different back
panel that goes with that, and a little cardcage you can fit
to that backpanel that has a DIO slot). I just fixed a 16Mb memoryboard for my 360 by
reverse eng.
the memory
decoding and buffering circuits.
The interface board contains 1 big pga i/o chip
(propriarity hp) but
the rest is TTL and some LSI-chips.
Custom LSI, or things I might have heard of? It's not the PGA
package I oject to per se, rather it's the fact I can't get
data or replacements for some of the ICs. The hi-res video boards are build from pga's
and ram, but
you use also
older video boards Or plant a 68030
acceleratorboard in a
HP 9816, you
wouldn't beleivbe your eyes how fast the
thing gets then ;-)
I can believe it :-). Actually the 12.5MHz 68010 in the
9836CU and 9817 feels noticeably faster than the normal 8MHz
68000. I assume it's just due to the 1.5* clock speed.
The 345/375 and 382 types are more 'modern'and build in SMD
with a lot
of special function chips.
But the 345 has a 68040 emulator board wit a 68030 implemented.
So please don't throw them all away because of a few pga's ;-)
As if I would :-)
I worked on mine it had a bad video/terminal ram chip,
thanks to the
diagnostic LED's it was easy to find.
Right.
With not very handy I was refering to the use of
the
machine, and it
is big takes a lot of space.
Yes, I ahev a 2623 terminal (same case) somewhere -- I
borrowed the keyboard from it as a possible keyboard for the
HP120 (I described that work a couple of months back). I must
extract the terminal iteself sometime and have a serious look
at the insides. -tony
Rik