Re: [M100] Tandy Portable Disk Drive 2 service manual PDF now available.
Thanks, I figured it HAD to be a typo, otherwise it would be rather ironic for it to have more than 5x as much RAM as the standard 100 could support. On Mon, Jan 8, 2024, 12:05 Darren Clark wrote: > I think the 128K or RAM is a typo and should only be 128 bytes. Looking at > page 97 (set the data to drive's memory) and page 89 (get the data from the > drive's memory), there is only enough room to request 125 bytes at a time. > > Also from my disassembly of the TPDD1 ROM and the very similar > architecture (same CPU and RAM and CPLD), there is only 128 bytes of > scratch ram. >
Re: [M100] Tandy Portable Disk Drive 2 service manual PDF now available.
Geez, up-front the manual said 128K of RAM! I was thinking one could reprogram the ROM to make it a ram disk for a sec there, but the parts list only shows 2K of SRAM unless I missed something? Anyway, thanks much for the efforts, all! Great stuff. Tim On Mon, Jan 8, 2024, 10:23 wrote: > The TPDD2 service manual in all of its glory... > > > > https://archive.org/details/tpdd-2-service-manual > > > > Jeff Birt >
Re: [M100] M100 keyboard character map?
Appendix O of "Hidden Powers" has a list, but not formatted in a nice table. Starts on page 237. Tim
Re: [M100] Howdy! New to list, need some parts…
Thanks for the Deoxit tip! I have a Casio VL-Tone that has two scratchy sliders but is otherwise pretty perfect for a 43-year-old device, may give that needle bottle a shot. On Fri, Jul 16, 2021, 22:56 Greg Swallow wrote: > Hey Earl, > > Welcome to the list. > > Deoxit on the pot. Amazon has it in a "precision" dropper here: > https://www.amazon.com/dp/BYH6F8/ref=cm_sw_r_cp_apa_glt_fabc_HYHBJZ4YAQW7PX7RC30P > > Greg @ arcadeshopper.com has most parts you'll need. Including complete > re-cap kits. Just picked up a couple kits with a replacement TPDD2 belt > myself. > > God Bless, > > GregS <>< > > Jul 16, 2021 5:03:08 PM Earl Baugh : > > > Howdy! > > > > I’m new to the list and recently picked up a model 100 that needed some > restoration. A friend helped me get the bad caps replaced, cleaned the > power plug and we diagnosed a bad member switch and bad pot for the lcd > contrast adjustment. It’s working again (hurrah), with a solder bridge on > the switch and some resistors temporarily in place of the pot. ( we also > removed the battery before any leakage or damage ) > > > > Is there anyplace where I can get replacement parts for the pot and > switch without digging thru a Mouser or Digikey catalog? ( or the part > numbers at least to save a number of mis orders? 😊) > > > > Earl > > > > > > Sent from my iPhone >
Re: [M100] User number in CP/M for M-100?
The "user number in prompt" and "execute from user 0" thing are BDOS extensions from a given manufacturer and not part of standard CP/M 2.2, if I recall correctly. It may have become standard in CP/M 3.0, but that's not really germane here. On Tue, Oct 6, 2020, 17:26 Bert Put wrote: > Hello, > > I was wondering which version of CP/M that this was based on? > I'm specifically looking for support for "user numbers" since CP/M does > not support directories. My Kaypro runs CP/M 2.2G and 2.2H. In those > versions, the user number is part of the prompt, such as A0> or A1>. > Also, if you navigate to user area 1 with "USER 1", you can call any > executable in user area 0 in case it does not exist in user area 1. > There are 16 such user areas available, 0 to 15. >
Re: [M100] REXCPM 102 - it's arrived - Let's Livestream an install!
Very nice stream, Josh! The whole time you were hooking the screen and keyboard back up I was internally screaming "THE BOARD COVER!!" but I knew you'd get it. Tim
Re: [M100] REX3?
I still have one, and a PX-4 as well. Both can also use a battery-powered serial-connected 3.5 floppy drive, which I also happily still have. On Wed, Mar 11, 2020, 13:51 Tom Wilson wrote: > Also, if you're looking for an 8-bit CP/M laptop, the Epson PX-8 is > exactly that. It runs CP/M from ROM and uses a RAM disk for storage. > (Strangely, it uses a cassette for mass storage.) >
Re: [M100] Somewhat off-topic, but... Epson CP/M portables?
I have both a PX-8 and a PX-4, and I /believe/ they run straight off power alone but am not positive. If you can't get an answer let me know and I can experiment for you, both are in a box in my room at home easily at hand. They both have ramdisks attached as well. Tim On Fri, May 8, 2015, 12:36 Christopher Barnett Fox wrote: > I just acquired an Epson PX-8 "Geneva" in pristine physical condition, but > it won't seem to power up. I'm leaving the batteries to charge for 24-48 > hours, but I'm skeptical they have any life left in them at all. > > Should these old Epson portables run off the charger circuit alone? I > think the Tandy Model "T" series adapters should be compatible (6VDC > output, but only 500mA whereas I believe the original Epson charger was > 600mA), but I haven't had any luck powering the PX-8 just yet. I can see > the LCD screen appears to turn on, but sliding the contrast only appears > to make the screen uniformly slightly dark. Pressing the sub-processor > reset button hasn't helped. > > Christopher > >
