Re: [M100] ROM AvailableHi Gary, Nice boards! A little different from mine; they both (optionally in my case) convert the non-standard pinout to the JEDEC 27Cxxx standard, but while yours is meant to provide alternate system and option ROM images mine was intended to provide an option ROM without the PITA of using the option ROM socket.
I don't like to use machined pins because they tend to distort the socket, so the pins I used are flat and allowed flush-mounting; I also didn't socket the EPROM so clearance wasn't an issue. Obviously if you use the option ROM socket instead of removing it you will have problems unless you use a board with a smaller OTP ROM that actually sits inside the Molex socket. Incidentally, there is such a board on OSH Park that uses a 32-pin PLCC 28x256 EEPROM, courtesy of Adam, KD5VMF; it only remaps the pins but could probably easily be modified to fit inside the Molex socket and also provide alternate images: https://oshpark.com/shared_projects/hrtzE16O m ----- Original Message ----- From: Gary Hammond To: Model 100 Discussion Sent: Wednesday, March 30, 2016 5:56 PM Subject: Re: [M100] ROM Available Hi All, I wish I had known about the other ROM board earlier. I ended designing my own board which I have been using for both the M100 ROM and the option socket. Photos of my board are at http://trs80stuff.net/m100-option-rom/ For the M100 ROM, I use an 256k OTP with the M102 ROM image modified for Y2K. For the option socket I have removed the old style molex socket and replaced with my adapter board. Some observations: a.. I can’t use a an IC socket on both the M100 board and the option ROM board at the same time without hitting height problems. It is ok for the option ROM providing you don’t want to put the cover back on. b.. For the ROM socket I solder the pins to the adapter board the clip the top side pins as close as possible to the PCB. I then solder in the programmed OTP. The keyboard does touch the top of the OTP however it alls goes back to gather with no visible bulge in the keyboard. c.. For the option ROM socket I do it the other way, i.e., I solder the adapter board to the M100 main board and use a socket on the adapter board. I have found that trimming the legs of the EPROM slightly gives me just enough height to put the cover back on. I have not been able to find any really low profile pins. The ones I got add about an extra 4mm to the board height. If any one can point me at some low profile pins it would be appreciated. Cheers, Gary From: M100 <[email protected]> on behalf of Bill Nobel <[email protected]> Reply-To: Model 100 Discussion <[email protected]> Date: Thursday, 31 March 2016 at 9:35 AM To: Model 100 Discussion <[email protected]> Subject: Re: [M100] ROM Available Hi Georg Thanks for the link. I just ordered 6 of the boards from OSH Park, cost me only $20 so quite cheap. I have been looking for this exact thing for a while. Bill Nobel On Mar 30, 2016, at 9:04 AM, Georg Käter <[email protected]> wrote: Hi Bill, this http://bitchin100.com/wiki/index.php?title=M100ROM might do the job for you. I´m using it on my M100 since ~1 year with a TS-DOS. Only difficulty was getting the pins here in Germany, but finally I got it. Regards Georg Käter ========== Ihre Nachricht ========================================== von : Bill Nobel <[email protected]> gesendet : Mittwoch, 30. März 2016, 07:46 an : Model 100 Discussion <[email protected]> Betreff : [M100] ROM Available __________ Originalnachricht _______________________________________ > Hi Kurt > Question for a Model T newbie (but not a newbie in a programmer > sense). I have an eprom burner and a bunch of 27c256 eproms. How > hard is it, or if you can reference a schematic to remap the option socket to this eprom. > I have been playing with Byteit assembler on the T alone to > transition myself from a hardcore 6809 programmer to the 8085 (not > finding it that difficult other than not knowing memory layout by > heart yet) I do have VirtualT up and running for my real programs > that I have in mind, as well as asm85 on my PC. I would also like > to know if Byteit is my best choice for the assembler on the T alone > (I can’t seem to find a good assembler on the T). > My problem I wish to resolve is to get TS-DOS onto the option rom > so I can use TPDD protocol instead on ASCII/XMODEM transfers. I > seem to have good communication between the PC/Model-T @ 4800 baud > for ASCII & 19,200 baud for Xmodem, but have never gotten any of the TPDD Servers/Clients working.. > Bill Nobel >> On Mar 29, 2016, at 11:15 PM, Kurt McCullum <[email protected]> wrote: >> >> The beta version of SARDOS for the NEC is available for download. Gary Weber put it on the web8201.net site for me. >> >> Kurt __________ Ende Originalnachricht __________________________________ Vertraulichkeitsinformation: Diese Nachricht ist vertraulich. Die Informationen dieser Nachricht sind ausschließlich für die persönliche und vertrauliche Verwendung durch den/die oben genannten Empfänger bestimmt. 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