Wow those sure look perfect. Especially that last one because it uses easy to source pin headers for legs.
-- 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 > >>> > >>> > >> > > >
