> Does anyone know if the updated M100 ROM is still available? Short answer: yes.
Long answer: 1 - There are two common physically incompatible versions of the ROM and motherboard: - If your M100 is newer than 01/01/84 (serial no. starts with '4') then it will probably use a JEDEC standard 27C256 type; those are a drop-in replacement and I could send you one (programmed) for $3.00 plus postage from Toronto. - If your M100 is older than around September '83 (< 309xxxxxx) then it will probably use a non-standard ROM and you will need an adapter, available for $15.00 including the EPROM (unless you're comfortable building your own; at least one member has done so). In any case but especially if the serial no. is between 309 and 401 you should probably open it up and confirm the part number of the ROM and the motherboard (Old: PLX110CH1X, New: PLX110EH1X, assuming we're talking about the North American version). - If you do need/choose the adapter then you get an additional bonus: an option ROM of your choice (usually TS-DOS) can be integrated into the same chip at no extra cost; this also applies to the 'new' version ROM if using the adapter. 2 - As to the actual contents of the replacement EPROM, the main reason for an update is the Y2K of course; there is also a minor correction to one of the math constants and some people prefer the 102's pi symbol to the M100's vertical bar. I personally also prefer a com default value of 19,200 baud instead of the 300bd modem which I almost never use, and some folks like to replace the MS copyright with a message of their own as in Virtual T. Anything trivial can be modified. m ----- Original Message ----- From: Jeff Greer To: [email protected] Sent: Friday, January 29, 2016 9:38 PM Subject: [M100] M100 ROM still available? Does anyone know if the updated M100 ROM is still available? Thanks, Jeff -- http://faroutscience.com
