HP 97s test - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: General Forum (/forum-4.html) +--- Thread: HP 97s test (/thread-20178.html) |
HP 97s test - zixingcheche - 07-15-2023 07:06 AM Hello all, I just got a HP97s with good shape both calculator & BCD interface. the calculator seems work well. but for the BCD interface. Does anyone know how to test it? I just tested it with multi-meter to measure the voltage between: ---- pin1(GND) and pin26 DC 0V ---- pin1(GND) and pin27 DV 0.3mv ---- pin1(GND) and pin28,29,30/ it is DC4.5V ---- pin1(GND) and pin6~25 & P31~50/ it is DC5.3V please give me some advice, thanks! BR, bai RE: HP 97s test - AndiGer - 07-15-2023 08:38 AM Do know this article? https://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=380 You can build your own test connector using the MM80C98 chip. The plug is a Centronics 50 pin. I think the original test connector is a double layer PCB. So not easy to change a faulty chip. The test program is inside the installation and operating guide found at https://literature.hpcalc.org/community/hp97s-iog-en.pdf Good luck Andi RE: HP 97s test - zixingcheche - 07-15-2023 09:21 AM Hello Andi, Thank you for your reply. Yes I checked the article and go through the manuals. It is hard for me to make a test connector. I would like to think it works.. haha BR, Bai RE: HP 97s test - teenix - 07-15-2023 09:38 AM Mouser Electronics lists the Amphenol 57-30500 connector. Not sure if it is the same as the 97S module or the mating connector. cheers Tony RE: HP 97s test - zixingcheche - 07-15-2023 10:01 AM Thank you Tony! Maybe need your replacement CPU board finally. RE: HP 97s test - John Ioannidis - 07-18-2023 01:33 AM (07-15-2023 09:38 AM)teenix Wrote: Mouser Electronics lists the Amphenol 57-30500 connector. Not sure if it is the same as the 97S module or the mating connector. it lists it as obsolete, with 0 in stock, as does DigiKey. There are other connectors with a variety of attachment options; they cost under USD 10. Your best bet is finding a friend above a certain age who may still have a SCSI Centronics cable (50-pin; the printer cables had 37 positions, not 50) that you can cannibalize. The MM80C98 is also long since obsolete; the 74LS368 looks like it has the same functionality, but double-check with the data sheets. RE: HP 97s test - teenix - 07-18-2023 02:04 AM (07-18-2023 01:33 AM)John Ioannidis Wrote: it lists it as obsolete, with 0 in stock, as does DigiKey. There are other connectors with a variety of attachment options; they cost under USD 10. Your best bet is finding a friend above a certain age who may still have a SCSI Centronics cable (50-pin; the printer cables had 37 positions, not 50) that you can cannibalize. Ahh ok :-) tedds.com $10 TheBay has some second hand. Curious what the hex inverter is used for. cheers Tony RE: HP 97s test - AndiGer - 07-18-2023 05:10 PM (07-18-2023 01:33 AM)John Ioannidis Wrote: The MM80C98 is also long since obsolete; the 74LS368 looks like it has the same functionality, but double-check with the data sheets. Current ebay listing here in Germany (59 sold, more than 10 available) for the MM80C98 https://www.ebay.com/itm/381669844310 Ships worldwide with a LONG list of exclusions. So less than 10 countries left. Another one https://www.ebay.com/itm/222440092258 - pack of 5 that ships nearly worldwide. Or from China: https://www.ebay.com/itm/323482296882 Andi |