I have an interesting NEC PC-8300 with a custom 2NDROM by VSI Corp. I figured I'd put together a few images in case someone's as curious as I am.
Previously attempted to send as an attachment. Here is a google drive post instead. https://drive.google.com/open?id=1w7hzeDeT7mQNhpwPX9Y8bbHjtluwC7Ae > On June 26, 2018 at 4:39 PM [email protected] wrote: > > > Send M100 mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.bitchin100.com/listinfo.cgi/m100-bitchin100.com > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of M100 digest..." > > > Today's Topics: > > 1. Re: nn - getting back involved. (Brian White) > 2. NEC Low battery light update (Kurt McCullum) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 26 Jun 2018 03:08:35 -0400 > From: Brian White <[email protected]> > To: [email protected] > Subject: Re: [M100] nn - getting back involved. > Message-ID: > <cao0vv2b74dsswyktqpuik0srqrqxoocbvt9shv77vlc1p8-...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > I have about 100 of the old original carriers if anyone wants any. The > carriers aren't really that useful or valuable since, aside from the fact > that they are replaceable by printing (2 different versions even) only the > Model 600 uses a standard 27C256 pinout in the option rom socket. For 100, > 102, & 200, the only thing a carrier is good for is if you broke an > original carrier on a real option rom with the borkded pinout. > > For model 600, you can burn a standard 27C256 and stick it in a carrier and > pop it in the 600. So the carriers are useful for Model 600. > But there is almost no romware to play with and little documentation to > make some from scratch for the 600. > There are exactly 2 rom images available to be examined and hacked on, and > a little bit of info on the format of a rom, but I think not quite enough. > > For burning your own roms on anything but 600, you need a module like REX > or Figronix or ROMBO which don't fit in a carrier. They are their own > carrier and go right into the socket. > > (Unless the NECs also use a standard pinout? I don't have one to double > check.) > > Now the *sockets* are a little more interesting because: > * you could repair a damaged socket in a 100/102/200/600/NEC > * you can use one as part of a programming adapter for re-flashing a > Figtronix module in an eprom burner > * using same programming adapter to read an old option rom in a eprom burner > * as a jig to supply power to a REX while flashing it's CPLD (IE, while > building your own REX from scratch, or perhaps reflashing it from 100/102 > to 200 firmware) > > I have a bunch of those too and am handing them out in ones/twos to anyone > who wants one for free. > I'm not selling them, just handing them out, so that I can dribble them out > to as many different people as possible for as long as possible. > I don't have an absolte rule like "max 2 per person" but that's the limit > I've been doing so far. But I'm open to hearing why someone might need a > few more . Like say you are repairing M100's for other people and it would > be useful stock for doing that, or you actually have 3 or more M100's with > broken sockets, or whatever. > > -- > bkw > > > On Mon, Jun 25, 2018 at 3:18 PM Josh Malone <[email protected]> wrote: > > > > ps: Are there any other club100 peeps on the east coast? > > > > Central Virginia in the house! :) > > > > And I'd probably be down for a couple chip carriers even though I have > > a REX. Lemme know. > > > > -Josh > > > > > -- > bkw > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/attachments/20180626/f78bb331/attachment-0001.html> > > ------------------------------ > > Message: 2 > Date: Tue, 26 Jun 2018 09:06:21 -0700 > From: Kurt McCullum <[email protected]> > To: [email protected] > Subject: [M100] NEC Low battery light update > Message-ID: > <1530029181.3369499.1421060320.66fe2...@webmail.messagingengine.com> > Content-Type: text/plain; charset="utf-8" > > A couple weeks ago I was asking about the low battery light on my NEC when > using rechargeable batteries. The problem was that after about 45 minutes the > low battery light would come on because the voltage difference (1.2 vs 1.5) > of Alkaline vs NiMh batteries. Originally I was going to look at the > power?supply itself to see if I could replace a resistor so that the light > would come on at a lower voltage. I opted to leave the power supply alone and > focus on the battery. > > I bought?ten 1/3AA NiMh batteries and built a battery pack. There are two > banks of five 1/3AA batteries and two spacers(S1 & S2). The ending battery > pack looks like this: > + - > | S1 S2 | > | | | | > | | | | > --- --- > > S1 has a wire that goes to ground, and S2 has a wire going to positive. The > two 5 battery banks are in parallel and each bank has a capacity of 300mah, > giving a total capacity of 600mah. The batteries that I took our of the > original NiCd back were 500mah so it's very similar to the original which was > rated to give 5.5 hours. I'm still testing but so far the battery light issue > has gone away. I need to see how much time I have left once the low battery > light comes on because rechargeable batteries fall off rather quickly. > Voltage on the pack is 6.4v when charged. Very similar to what new Alkaline > batteries would give. > > A Regular 4 battery NiMh battery pack has a much longer run time but the > problem is that you never know when you are almost out of power. The low > battery light is on almost the entire life of the battery. > > I'll keep you posted on my testing results. > > Kurt > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > M100 mailing list > [email protected] > http://lists.bitchin100.com/listinfo.cgi/m100-bitchin100.com > > > ------------------------------ > > End of M100 Digest, Vol 90, Issue 21 > ************************************
