On Thu, Jul 6, 2017 at 10:17 AM, Brian White <[email protected]> wrote: > Wow those sure look perfect. Especially that last one because it uses easy > to source pin headers for legs.
not at all. All the modules use the Batten & Allen "IC pin replacements". There's no room (at least into the Olivetti M10) to use standard pin strips, the vertical clearance isn't enough. Frank > > -- > bkw > > On Jul 6, 2017 3:13 AM, "Francesco Messineo" <[email protected]> > wrote: >> >> Hello, >> I'm new to this list, I've been just reading for a while. >> >> On Thu, Jul 6, 2017 at 6:14 AM, Brian White <[email protected]> wrote: >> > 102 is easy. 100 is not so easy. >> > >> > There was a guy in Romania selling NEC branded modules dirt cheap last >> > year >> > but those are gone now. Or at least they're not on ebay any more. They >> > weren't labeled for model-100, I just found them by searching for the >> > main >> > chip number, took a chance, and they turned out to not only fit but also >> > work. Maybe I should save his info before I lose track of it, in case he >> > does still have some. >> > >> > Maybe modules for 100 are another good candidate for an open OSH Park >> > design >> > that people can build new on-demand. The basic wiring for adapting to >> > some >> > more common chips is well documented. >> > >> >> I've made many RAM modules replacement for the Olivetti M10 (and all >> the other compatibles) for some friends that asked for batches of >> them. >> Here's how one module looks like inside my M10: >> >> https://www.dropbox.com/s/iwyjg7p22c8xt5t/IMG_1484.JPG?dl=0 >> >> I've developed also a custom setup to test the modules outside the M10 >> (socket was getting >> worn out during my prototype tests): >> >> https://www.dropbox.com/s/38q01n8gckuz3of/IMG_1906.JPG?dl=0 >> >> And here's one of the batches I've made for an italian collector: >> >> https://www.dropbox.com/s/c5zes6lgevdkz2n/IMG_0266.JPG?dl=0 >> >> And here's another version of the module with slightly different logic >> to use different SRAM >> chips: >> >> https://www.dropbox.com/s/1p9tz1jgirbfaee/IMG_1601.JPG?dl=0 >> >> The test setup include different address and block tests and also a >> standby current measurement as these modules must not draw more than >> 2-4 uA during standby conditions to allow the memory battery backup >> last a reasonable amount of time. >> Most of the modules settle to much less than 1 uA standby current. A >> few ones went up to 1 uA. The original modules can draw up to 4 uA in >> standby mode. >> >> Best regards >> Frank IZ8DWF >> >> > -- >> > bkw >> > >> > On Jul 5, 2017 10:29 AM, "Jason Benson" <[email protected]> >> > wrote: >> >> >> >> I want to fix the 8201A but I haven't had any luck yet determining the >> >> cause of the trouble. (see other thread about internal NiCd batteries) >> >> >> >> On Wed, Jul 5, 2017 at 10:05 AM, Josh Malone <[email protected]> >> >> wrote: >> >>> >> >>> What happened to the 8201A? It might be more beneficial to just repair >> >>> that. >> >>> >> >>> I can tell you from experience that SRAMs for the model-T are easy to >> >>> come by. (I recently replaced a RAM chip in my 102 w/ parts from ebay) >> >>> No >> >>> reason to scavenge other machines for these parts. >> >>> >> >>> -Josh >> >>> >> >>> On Wed, Jul 5, 2017 at 9:19 AM, Jason Benson >> >>> <[email protected]> >> >>> wrote: >> >>>> >> >>>> My 8201A that died the first time I tried to use it has a full set of >> >>>> ram expansions. Are those ram expansions usable in any of the other >> >>>> computers from the M100 family? I imagine the NEC PC 8300 probably >> >>>> uses the >> >>>> same chips, but probably not the M100/102. >> >>>> -Jason >> >>> >> >>> >> >> >> >
