I have a 1969 Signetics catalog and there was an older BCD-to-Nixie driver called 8T01, also in 16 pin DIP, but with a different pinout from the 7441. So if you find the pins are not working out, Google the 8T01. I see a data sheet out there for it. They offered a few different counters, but the 8280 was their basic BCD one, so that is probably correct.
Best of luck with it! On Mar 12, 6:57 pm, clu <nico.n...@gmail.com> wrote: > Alright, here we go, > > Important note: pin 4 is not common and pin 2 is not +5V (I wish I could > edit my first post to avoid misinformation). > > The numbers were definitely Burroughs house numbers. Fortunately there is > this document > (http://bitsavers.org/pdf/burroughs/icData/burroughs_IC_crossref.pdf) that > at least lists the functions of the chips (page 61). I'm part of the way > through a schematic of the BIP-8820-1 which certainly agrees with the > functions of the chips. The 906 1627 1363 is a "BCD to Decimal > Decoder/Driver." The 849 1627 1371 is a "Counter/Storage Register." > Fortunately Signetics datasheets still exist here > (http://bitsavers.org/pdf/signetics/_dataBooks/1972_Signetics_Full_Lin...). > It appears that the 906 (BCD to decimal decoder/driver) is equivalent to a > Signetics 7441 (page 2-40) and the 849 (counter) is equivalent to a > Signetics 8280 (page 3-90). So I think I've found all the features of the > BIP-8820-1 along with the pinout. > > I'll post the schematic and pinout soon after I do a good test. > > Thanks for the tips! > > ~clu > > > > > > > > On Sunday, 11 March 2012 20:38:04 UTC-6, nixiebunny wrote: > > > On 3/11/12 5:12 PM, clu wrote: > > > I found two old Signetics chips in there. The Signetics logo is the one > > > used in the late 60s but I can't find any data using the part numbers on > > > the chips. Can anyone identify these chips (image links below)(I'm > > > assuming one decade counter with BCD output and a nixie driver)? I'd > > > like to make an unofficial BIP-8820 datasheet for anyone else out there > > > with these... > > > >http://i.imgur.com/V2Cos.jpg > > > >http://i.imgur.com/3nn1i.jpg > > > Those are definitely Burroughs house numbers, since the number on the PC > > board under the chip in the second photo has a number with the same format. > > > Good luck on the reverse engineering! > > > -- > > David Forbes, Tucson AZ -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
