22 Jun
2009
22 Jun
'09
12:16 p.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] Namens Tony Duell
Verzonden: maandag 22 juni 2009 20:07
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)
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.
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 ;-)
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 ;-)
I'd
much rather have an HP9000/200....
-tony
Me too, and for the speed a HP 9000/300 ;-) I like the
view of a HP 125 ET-head but it is not a very
handy machine.
It is an interesting styling and odd to work on -- release a
quarter-turn fastener, slide the casing slightly forwards on
the stand, then lift it up on a stay. You can then release
some Nylatch clips and lower the processor board to work on that, The HP120, BTW (and the oriignal HP150, which has much
the
same physical
layout) is odd... You can remvoe the top casing with 2
quarter-turn fasteners, but that jsut gets you to the PSU
and monitor PCBs. To get to the logic boards, you have to
unclip the battery pack, then remove the jackposts on all the
connectors, and then remove 5 screws and the rear panel of
the card cage.
-tony
Rik