How to lose most of an an entire collection in one shot
hp-fix at xs4all.nl
Mon Jun 22 15:38:41 CDT 2009
> -----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
> > > 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).
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 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.
One custom LSI I think it's the I/O controller.
The others are Lance Ethernet Ti HP-IB controller HIL-chip, serial
controller 1820-3623 and some other standaard interface chips. The only one
that would bother you would be the HP 1TQ4-0401.
I'll make some pictures this week and put them on flickr so you can look at
> > 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.
> > 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.
I know was fun reading the story.
Hardware problems are always 'fun' ;-)
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