MrDave

512k coco is a great machine., i had installed a small fan in mine when i has one. You can easily find a small fan from a computer repair shop that only needs 5 volts. I would say it does get quite warm without the fan .. for the 2$ cost of a fan i would stay on the safe side..coco3's. Are getting to be rare...

When i piggy back soldered in my 6309 on top of the 6809 cpu a couple of pins had a bad connection and funny enough the background was orange with no text.. but im sure the basic rom must till the vdg which starting mode to use...

Ahh i seen you on cocotalk.. i'm dave of dave & sharron. Lol i suppose if i really wanna play with the roms i could swap in a static ram to figure everything out by trial.. but someone must have done it already... Thanks

Coco2 > vic20 Coco3 > commodore 64 The coco's were easy to upgrade ram and cpu and os's ! If you want to do mods there is alot of support still for coco's. For programming i would say a coco3 or c64 would be best choice.

I was able to get serial data out on my coco2 by jumping pin 2 of the serial port to the joystick +5v then i took the rs232 out ( pin 4 )to an inverter nand gate i was able to get 600 baud .. 1 low stop bit 8 data bits lsb first and 2 stop bits using print #2, chr$(data); Each bit was 1.65 ms I am going to be playing with this more to see what i can do with this.. maybe drive a small lcd screen,,

Ask what you can do for your coco .. not what your coco can do for you

Does anyone know if the screen color can be changed in the color basic rom ? I can easily reprogram the rom..

I bought a coco2 on ebay with pretty bad video looked around the board and found a bad 4700uf capacitor near the power supply it was bubbled up at the top and showed signs of leaking its an easy solder job to replace that it helped my problem.