22 Jun
2009
22 Jun
'09
1:04 p.m.
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.
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