paulba@tekgvs.LABS.TEK.COM (Paul T. Barton) (03/15/90)
> From tekgvs!tekcrl!zephyr.ens.tek.com!ogicse!caesar.cs.montana.edu > !samsung!munnari.oz.au!darrenr Wed Mar 14 09:03:40 PST 1990 > > > You mentioned that you plugged a 6309 chip into your coco but dos failed > to work. Did the coco work without DOS ? > > It would be great to be able to run os9 on the coco3 at a decent speed.. > > Darren Darren: I tried to send mail, but I guess I haven't figured it put yet. The COCO wouldn't work at all, with or without DOS. It seems that the 6309 doesn't like illegal codes. The 6809 doesn't care if it sees illegal codes, just plows through. The 6309 interrupts if it sees any illegal codes. COCO obviously has illegal codes. Besides the SAM can't go over ~2MHz. The SAM will run at 16MHz, I guess that the GIME will too.
garfield@sunspot.noao.edu (Brian Armstrong) (03/15/90)
I've been reading the ordeal of replacing the Color Computer CPU with a 6309 processor. Here's my two cents... I think the problem here has been the use of the 6309 instead of the 6309E. The Color Computer was designed to use the latter ONLY, as was the SAM chip. Use of a non-'E' version is sure to cause problems. Thus, I don't think illegal opcodes have anything to do with it. Try a 6309E to replace the 6809E (the original CPU), and see what happens. (If you want to get rid on the 6309, I'll take it for a pet project of mine!) Brian Armstrong, National Solar Observatory, Sunspot NM 88349