> >(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 :-)
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
>> 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.
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.
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).
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.
