13 Sep
1999
13 Sep
'99
9:41 a.m.
Hans,
At 06:40 PM 9/13/99 +1, you wrote:
thank you
> >> What do you want to know about them? BTW I know the display
> >> was listed as an option but I think they ALL came with it. I've never
heard
I just opened it (finaly - I could withstand for more than a week :),
and found a HUGE PCB (00046-66500 Rev C) with just 16 ICs and 5 spare.
Most of the chips are RCA, 5 are Mostek, and 2 are marked:
A*
MI
All but 3 parts have a numbering like 1820-0xxx, wher xxx is
939 14 Pin RCA 2x
946 14 Pin RCA 5x (Buffer ?)
848 16 Pin A*MI (Timing ?)
981 14 Pin RCA
993 16 Pin Mostek MK6036P (CPU ?)
994 40 Pin Mostek MK6037P (Decoder ?)
The Remaining 3 are numbered 1818 00yy where yy is
12 28 Pin A*MI (Keyboard Decode ?)
58 16 Pin Mostek MK6107P (RAM / ROM ?)
59 16 Pin Mostek MK6108P (RAM / ROM ?)
60 10 Pin Mostek MK6068P (RAM / ROM ?)(round package)
All A*MI and Mostek are Ceramic DIP, all RCAs are Plastic.
OK I'll see what else I can find. There will be a delay due the storm
(Floyd) bearing down on us here.
Joe
> >(Well, the Old lady asked if three pounds may
be to much ...)
> Cool find! Especially in the UK. I have five of them including two
> with consecutive serial numbers. I found four of them at one time at
> Patrick AFB.
We have to keep your head from getting too big :-)
>> of
one that didn't have it.
Sounds
logical - What I want ? EVERYTHING :)
AFAIK the 46 is just like the 45, but with Printer
and a 'real' keyboard.
Yes but internally it is completely different from the 45. It uses
mainly TTL chips instead of the hybrid CMOS ones that the 45 uses. It uses
a *LOT* more ICs than the 45.
4 of the 5 spares are routed almost paralell to the
1818-0058/9, so maybe here is room for more ROM /
Microcode (Which would make the 58/9 ROM and the
1818-0060 the RAM - I just can' belive that HP had
already planned for 32 more RAM locations (each holding
a 10 decimal digit number), so this must be ROM).
I checked my HP part number cross reference but I don't have a listing on
ANY of those ICs.
The Keyboard is decoded via a 16 Pin DIL socket (Hey, did
_maybe_ one of the Apple ][ designers seen a HP 46 before :)
Oh, of course there are two more ICs on the display 'option'
(the machines still operates well without the display, so
this is realy an option) - which gives a total of 18 IC -
spread over an area of almost A3 size...
If I take of the ICs obviously used only for the Printer
(seven), and assume that in a different layout no printer
decoding is needed and the display is included, I may come
come down to 10 IC, all but one 16 pin (one will be 28,
for the keyboard), so the ICs should be prety much the same
as in a hand held calculator.
Yes. I used to work for Burroughs and worked on many of their desktop
calculators and several of them used the same printer. I also used to have
a big Monroe Litton scientific calculator that used the same printer. I've
seen it used in many calculators from about 1972 till the mid '80s.
From first look the CPU seams to hafe a serial
architecture.
It uses a printer made by Seiko. A lot of
calculators of that vintage use the same printer.
I cant see any sign sayin Seiko. After all, the Printer was the
most surprising thing to find - a Drum Printer - well shure, I
know them as mainframe printers (I had 2 survivors to maintain
back in 1982), but I never knew this technology has been used
in desktop units ... The 46 was designed and
built by the Loveland Colorado Division of HP. The same same division that
built the 9800 series machines like the 9825, 9835 and 9845. The 45 was
designed and built by the Advanced Product division in Copertino
california. The 81 and 46 look the same on the outside except for the
functions but all the internal parts are differnt except for the LEDS,
power supply and printer. The HP 9805 is supposed to be the same style
machine and very similar to the 46 and 81 but I've never seen a 9805 so I
don't know any more than that. The 46, 81 and 9805 are all covered in the
same service manual.
I have a lot more back ground material on them but I'll have to find it.
If you have any specific questions I'll try to answer them.
Well, no specific, just anything to gather.
Gruss
H.
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Ich denke, also bin ich, also gut
HRK