CoCo 2 & 3 max speed

;-) Clearing the snow from my glasses, I saw John Higginbotham typed: Supported or possible??? There's a big difference, you know! ;-) Supported IIRC is only 300 (maybe 600) bps for the CoCo2, and 1200 for the CoCo3. I do remember many ads (adverts for our British friends, IIRC) claiming flawless 1200 (coco1/2) and 2400 (coco3) bps speed for a CoCo. Again, IIRC I heard rumors of someone actually getting 9600 bps thru the bitbanger, but I'm sure that's will all interrupts fully disabled in RSDOS with a memory-to-port (or vise-versa) transfer only -- no other functions like video, disk or anything else so you were xferring totally blind. This may also have been with a (Hitachi) 63C09* instead of a 6809, but I'm not sure. The place to ask would be the newsgroup news://bit.listserv.coco -- if you don't have access to that group, just let me know. I'm subscribed to an e-mail gateway to the list, so I can forward anything you need. HTH, "Merch" * Readers Digest version for those who don't know: Moto was looking for a 2nd source for their star 8-bit CPU at one point and hired Hitachi to build them as well -- but Hitachi did too good of a job. They doubled the accumulators, and like (A & B) = the D register, the other two 8-bit regs could be used in tandem for a 16-bit... and all four could be used in a limited fashion as a 32-bit register. Also, even on straight Moto 6809 code, once the CPU is put in 6309 mode, most people see a 15-20% overall increase in execution speed... there's even a modified version of OS-9 just for the Hitachi -- called NitrOS-9. Alas, I don't have anything like that, but from what I hear a NitrOS box is *fast*! All plug-for-plug compatible with our beloved Moto6809. -- Roger Merchberger | If at first you don't succeed, Programmer, NorthernWay | nuclear warhead disarmament should *not* zmerch(a)northernway.net | be your first career choice.