I could definitely help Steve out there Mike, I still have 3 boards available, with parts to add pins and socket (optional).
Bill Nobel b_nobel@ <mailto:[email protected]>hotmail.com > On May 9, 2016, at 3:09 PM, Mike Stein <[email protected]> wrote: > > Option 1: Buy a REX module. I'm not sure whether they're still available > through Club100 or you order them direct from Steve these days; I'm sure Ken > or Steve will log in and clarify. > > Option 2: If you just want to replace the System ROM in a *NEW* M100 (or > don't mind unsoldering the original ROM in a T102) then all you need is a > 27C256 like the one below at jameco. > > Option 3: If you want to replace the System ROM in an *OLD* M100 and/or add > an Option ROM to an old or new M100 then you'll need an adapter. If you're > only replacing the System ROM then a 27C256 is all you need; if you're adding > an Option ROM then you'll need a 27C512. > > If you're up to assembling the adapter yourself then you can buy 6 bare > boards for $20 at Oshpark: > https://www.oshpark.com/shared_projects/Kil9S1ya > <https://www.oshpark.com/shared_projects/Kil9S1ya> > > You might want to read: > http://bitchin100.com/wiki/index.php?title=M100ROM > <http://bitchin100.com/wiki/index.php?title=M100ROM> > > You might also want to read the thread about Bill Nobel recently doing what > you want to do in the Bitchin100 archive, March and April; maybe you and he > can even get together off-list. > > Maybe he has a spare board that he can sell you; if not, I could probably > come up with one. > > m >> ----- Original Message ----- >> From: Steven Ranft <mailto:[email protected]> >> To: Club 100 Model T <mailto:[email protected]> >> Sent: Monday, May 09, 2016 4:22 PM >> Subject: Re: [M100] ROM burning questions >> >> Hi Mike, >> I would like to replace my system ROM with a Y2K compatible version. >> I would like to install the best single option ROM I can. >> Would this chip work? >> EPROM 256K-Bit 32K x 8 250ns 28-Pin DIP >> http://www.jameco.com/1/1/2864-27c256-25-27c256-eprom-256k-bit-32k-x-8-250ns-28-pin-dip-memory.html >> >> <http://www.jameco.com/1/1/2864-27c256-25-27c256-eprom-256k-bit-32k-x-8-250ns-28-pin-dip-memory.html> >> >> Does anyone know where can I buy the adapter board for the ROM Socket? >> >> Steve Ranft >> >> Savage, MN >> >> >> From: [email protected] >> To: [email protected] >> Date: Mon, 9 May 2016 15:25:26 -0400 >> Subject: Re: [M100] ROM burning questions >> >> Hi Steve, >> >> Where to begin... >> >> First of all, you're talking about two different and separate ROMs and their >> sockets, the System ROM which runs the computer and provides the various >> built-in applications, and an Option ROM which, as the name suggests, adds >> one or more optional programs or features. They are both 28-pin 32KB (256Kb) >> chips, so your 32-pin 128KB 27C010 chips will not fit without major >> adaptation. >> >> As you (re)discovered regarding North American models, early M100s (prior to >> late 1983) used a non-standard pinout while later M100s and the T102, T200 >> etc. used standard 27C256-compatible ROMs; the change seems to have been >> made somewhere between serial numbers 309xxxxxx and 401xxxxxx. >> >> If you want to replace an early M100 System ROM you will have to make or buy >> an adapter; a fellow list member just built some using this board: >> https://www.oshpark.com/shared_projects/Kil9S1ya >> <https://www.oshpark.com/shared_projects/Kil9S1ya> >> Replacing a later model M100 System ROM is just a matter of plugging it in, >> but in the T102 it is soldered to the board and would require unsoldering >> the original ROM. >> >> The Option ROMs use a completely different socket arrangement, a Molex IC >> 'carrier' with non-standard pinout but you can use the adapter above which >> lets you combine the System and Option ROM in one chip that plugs into the >> System ROM socket (old or new). At one time there was an adapter available >> from several sources that would let you put an OTP (not re-programmable) >> EPROM into the option ROM socket but they seem to not be available any >> longer. >> >> Most people use Steve Adolph's REX module, which lets you put several >> different ROM images into one flash memory and I believe the later versions >> also permit changing the System ROM; see: >> http://bitchin100.com/wiki/index.php?title=Rex >> <http://bitchin100.com/wiki/index.php?title=Rex> >> >> Another very useful add-on is/was the NADSbox but I believe they're no >> longer available unless you find a used one; a newer version may or may not >> become available in the future. >> >> Can't really give you a step-by-step since I don't know exactly what you >> want to do with/to what. >> >> Good luck! >> >> m >> >> >> ----- Original Message ----- >>> From: Steven Ranft <mailto:[email protected]> >>> To: Club 100 Model T <mailto:[email protected]> >>> Sent: Monday, May 09, 2016 11:32 AM >>> Subject: [M100] ROM burning questions >>> >>> 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 BoosterPAK >>> >>> I did buy a e-prom burner (USB MiniPro TL866CS Universal BIOS Programmer) >>> and some blank e-proms (27C010-12 >>> <https://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_74624_-1>), >>> 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 America >>> PLX110EH1X 27C256 compatible 3256C07-3J1 late North America >>> PLX120CH1X 27C256 compatible 3256C05-3E1 European/Italian >>> I 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 >>> <https://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_74624_-1>" >>> 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
