This driver definitely matches the 7441 pinout. Thanks for the heads up though.
I've tested the driver with the new pinout I worked out and everything works nicely. I'm attaching a schematic in case anybody else with the same problem stumbles across this in the future... ~clu On Monday, 12 March 2012 22:07:01 UTC-6, Fetguy wrote: > > 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 <[email protected]> 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 view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/dWtMZ7Bxp5gJ. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
<<attachment: BIP-8820-schematic.png>>
