Thanks for posting those links. When I mentioned the various options for adding/upgrading System and Option ROMs I wanted to include this one but at the time the link at Oshpark didn't seem to work; I couldn't find any mention on his Figtronix site either so I assumed they were no longer available for some reason. Glad to see they're back and he's added a programming adapter.
One advantage of those boards over the board Bill and Steve are discussing is that in a T102 you can add an Option ROM without removing the System ROM chip; however, at the risk of being immodest I should point out what I think are some advantages of the 'Combo' board: Whether you want to upgrade the System ROM and/or add an Option ROM in either an old or a new M100/T102 you use the same board; no need for separate System and Option ROM adapters. To (re)program the IC in an 'old' M100 you'll need another adapter to convert the pinout back to standard JEDEC; no problem, just assemble another adapter 'in reverse' as it were, with a socket. So the one PCB essentially does the same job as all three different Figtronix ones; since you get a minimum of six boards you might save some money. Finally, since it uses a standard 28-pin socket if you want to play around with the System ROM code without burning/replacing/reprogramming the E(E)PROM every time, replace it with a non-volatile RAM chip like the Dallas DS1230Y or the FM1808 FRAM and a minor mod to connect R/W and you can POKE around all you want.. m ----- Original Message ----- From: Brian White To: Model 100 Discussion Sent: Saturday, May 14, 2016 11:42 PM Subject: Re: [M100] ROM burning questions ...Re-post without pic... Old m100 takes a non-standard pinout, new m100 and all t102 takes a standard 27C256 pinout. I just did an old m100 using this plcc adapter: https://oshpark.com/shared_projects/toQDqmVV I burned the Tandy 102 rom with y2k patches from the rex page on bitchin100. The board is easy to assemble except the only hitch is you have to find pin headers that have thinner round pins rather than the more common square. If you have a "new" m100, the chip number on the rom will not match the number silkscreened on this board. In that case you don't need any adapter, just put in a 27C256 dip28 directly, same as for T102. https://goo.gl/photos/GUKXgxxVGaUVt57k9 -- bkw
