on second thought you are right, ground should be on pin 7 since it is a TTL port. It isn't an RS-232.
On Wed, Dec 23, 2020 at 6:49 PM Stephen Adolph <[email protected]> wrote: > fair, but pin5 is ground on an RS-232 DB-9. So, that is what I used on > MVT100. I think in the future I will just wire both to ground on the > MVT100 board. > > On Wed, Dec 23, 2020 at 6:39 PM Brian K. White <[email protected]> > wrote: > >> Pin 5 is an odd extra ground on the M100. Pin 7 is the ground for the >> spec, all wands, and all machines with the port, including the 100. >> >> I looked at a lot of things for github.com/bkw777/BCR_Breakout >> including schematics or manuals for different wands and guns and card >> swipe reader which are used on more things than just the Model T clones, >> and also all the T clones that have any BCR port. (KC-85 doesn't) >> >> -- >> bkw >> >> >> >> >> On 12/23/20 5:34 PM, Stephen Adolph wrote: >> > Thank you for giving it a whirl Jim. Hopefully it is now "solid". I >> > have it running beside me now. ;) >> > So, you did the BCR hack as well? nice. >> > >> > I have the "hack" installed on one of my T102s. Works the same but (1) >> > the schematic is a bit different and (2) there is a missing ground on >> > pin 5 of the BCR port of the T102. So you need 2 straps instead of >> one. >> > >> > I must admit - I really like having a 15 inch LCD hooked up to the >> > T102. adds a lot. Too bad most option roms can't use it. >> > >> > However, one might. I think that ROM2/Cleuseau could be made to work, >> > with a bit of effort. >> > >> > Anyhow, that might be the 2021 activity - sorting out how to get ROMs >> to >> > work compatibly with VT100. >> > >> > Steve >> > >> > >> > On Wed, Dec 23, 2020 at 4:47 PM Jim Anderson <[email protected] >> > <mailto:[email protected]>> wrote: >> > >> > > -----Original Message----- >> > > >> > > Regarding the firmware for the MVT100 video adapter, I have >> > updated the >> > > firmware to address the scroll issue with TEXT. I've done some >> > > "designer testing" and it looks good. Of course I always >> appreciate >> > > test reports, thanks. Really helps me to conserve time. ( you >> would >> > > not believe how much time I have been dumping into my projects >> since >> > > Covid). >> > > [...] >> > > Good luck with the upgrade, and let me know how it goes. >> > >> > Hooray! Some brief testing with a few .DO files shows that TEXT >> > works great backscrolling even with the label line turned on! >> > Excellent! >> > >> > Loading the upgrade worked very well. The one note I might add is >> > to remind people that loading the new firmware reverts the saved >> > config settings back to default. This might be obvious to some but >> > I took a bit to clue in - I was baffled (and a little scared) when I >> > brought it back to my M100 and it wouldn't output anything after the >> > bootup message! I'm using the BCR hack so it was just a matter of >> > setting the baud rate back to 57600; most people will need to set it >> > to 19200 and re-enable the RS232 signal invert. (Oh, and if you use >> > the composite output, or even if you plan to try it in the future, >> > change it from PAL to NTSC so you won't be stuck wondering why it >> > doesn't work...) >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > jim >> > >> >> >> -- >> bkw >> >
