I am pretty new to retro computing. But have become an addict in the last year or so. I have Several M-100, M-102, M-200, NEC-8201 and NEC-8300 systems in working order. I also have a ROM Booster PAC. I really have only scratched the surface of learning to use these machines. I bought some "D43256AC-10L" chips and increased the Ram to 32 K on the ones I could. I managed to get Virtual T running on my Windows 7 desktop. I built a cable, and can connect and transfer files to and from a laptop running DOS via desklink I also bought a Tandy floppy drive and got that working too. I haven't yet tried to use the BoosterPAKI did buy a e-prom burner (USB MiniPro TL866CS Universal BIOS Programmer) and some blank e-proms (27C010-12), but HAD come to the conclusion that the M100s will not accept Standard ROMs. I found a file named What ROM.txt (... AND NOW know that was not accurate) it has a section like this: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Board Code ROM type ROM Code Comment==============================================================================PLX110CH1X custom LH535618 early North AmericaPLX110EH1X 27C256 compatible 3256C07-3J1 late North AmericaPLX120CH1X 27C256 compatible 3256C05-3E1 European/ItalianI did a quick survey of serial numbers vs. PCB code and here are the results.Generally, later serial numbers use the 27C256 compatible board.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I forgot about this information and just found it again. I have 102s and a 200 to try, and probably several of 5 M-100s. I am tempted to try to burn SARDOS and try to plug it in. I know i need to run a BASIC command to "jump to an address" to get it to use the new ROM. Does anybody know if there is a step by step "How to guide" for what I am going to attempt and if not, do you have any words of wisdom or warnings? I am pretty sure the "27C010-12" are "27C256" compatible chips or will find some, and I know to check the serial number list and that there are different versions of SARDOS for the various flavors of Model-T. Anything I am missing? I hope to create a document to guide other neophyte Model-T'ers through this an post it on the repository if I get through it! Thanks,
Steve Ranft Savage, MN
