Heh awesome Mike! You made your life extra hard by not using my diagnostic ROM for the Model 1 :-) That damn ribbon cable, though, which is bad on one of mine too...
Hey Adrian! Thanks for checking this out. Yeah, pretty sure I could have saved a lot of time using your ROM! I will have to load that in as a setting on the ROMulator Z80. I have another TRS-80 machine I'm hoping to get to soon, will have to try it on that. Those pesky ribbon cables..
Thanks for the reminder, I just put up the kicad files and gerbers for that adapter on github, hope it will be useful to others. The board can use 2716 or 2764 EPROMs or 28C16/28C64 EEPROMs to replace the MCM6670 character generator in the TRS-80 model 1. Will put this in the description as well. Files are here: github.com/bitfixer/pcb/tree/main/mcm6670_to_eprom
Yesterday I broke out the Model I I did a couple repair videos on last year. And wouldn't you know it, I had to open it up and hammer on it for a while before it'd behave after just sitting for a few months. In my case it was pretty minor stuff (I had to deox the vertical and horizontal position pots because it was glitching in both directions, and I also apparently have an intermittent bad connection in the spaghetti mess of a lowercase modification the previous owner installed) but... man, I can't help but get the feeling that these particular machines are getting too brittle to trust in their old age. Commodore PETs, with the exception of the bad RAM/ROM chips on the earliest SRAM models, feel positively bulletproof compared to Model Is.
Yes, I think it would, good idea. I had already cut a little bit off of the machine pins to see if that helped, but it was not enough. Will probably try it without the socket to see if that's enough, would be simpler and faster than making another adapter board.
Heh awesome Mike! You made your life extra hard by not using my diagnostic ROM for the Model 1 :-) That damn ribbon cable, though, which is bad on one of mine too...
Oh can you make that PCB for the character ROM available? Those chips are super hard to find so a replacement would be amazing.
Hey Adrian! Thanks for checking this out. Yeah, pretty sure I could have saved a lot of time using your ROM! I will have to load that in as a setting on the ROMulator Z80. I have another TRS-80 machine I'm hoping to get to soon, will have to try it on that. Those pesky ribbon cables..
Thanks for the reminder, I just put up the kicad files and gerbers for that adapter on github, hope it will be useful to others. The board can use 2716 or 2764 EPROMs or 28C16/28C64 EEPROMs to replace the MCM6670 character generator in the TRS-80 model 1. Will put this in the description as well. Files are here: github.com/bitfixer/pcb/tree/main/mcm6670_to_eprom
ROMulator is a great product and is a must buy!! It helped me out in many repairs. Thanks for sharing!
hey rudy, glad to catch u here
21:15 Your Jameco is local 😳 Wow!
Looking forward to your next video Mike.
Excellent!
Good job! 👍
Thanks very much!
Yesterday I broke out the Model I I did a couple repair videos on last year. And wouldn't you know it, I had to open it up and hammer on it for a while before it'd behave after just sitting for a few months. In my case it was pretty minor stuff (I had to deox the vertical and horizontal position pots because it was glitching in both directions, and I also apparently have an intermittent bad connection in the spaghetti mess of a lowercase modification the previous owner installed) but... man, I can't help but get the feeling that these particular machines are getting too brittle to trust in their old age. Commodore PETs, with the exception of the bad RAM/ROM chips on the earliest SRAM models, feel positively bulletproof compared to Model Is.
what eprom programer are you using? Thanks
For your ROM, would removing the socket get you the room you need?
Yes, I think it would, good idea. I had already cut a little bit off of the machine pins to see if that helped, but it was not enough. Will probably try it without the socket to see if that's enough, would be simpler and faster than making another adapter board.
@@bitfixer6502 I’ve been told that I have a mastery of the obvious. Lol! Hope it works!