Hans,
At 06:40 PM 9/13/99 +1, you wrote:
>> >> >(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).
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.
>
>>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 ...
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.
>
>> 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.
OK I'll see what else I can find. There will be a delay due the storm
(Floyd) bearing down on us here.
Joe
>
>Gruss
>H.
>
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>HRK
>
Received on Mon Sep 13 1999 - 16:41:17 BST