Path: utzoo!attcan!uunet!husc6!bloom-beacon!tut.cis.ohio-state.edu!osu-cis!killer!elg From: elg@killer.UUCP (Eric Green) Newsgroups: comp.sys.cbm Subject: Re: 2400 Baud on a C64? Message-ID: <4663@killer.UUCP> Date: 1 Jul 88 07:04:05 GMT References: <5087@orstcs.CS.ORST.EDU> <10455@dutyche.cair.du.edu> Organization: The Unix(R) Connection, Dallas, Texas Lines: 45 In message <10455@dutyche.cair.du.edu>, slindahl@udenva.cair.du.edu (Steve J. Lindahl) says: >In article <5087@orstcs.CS.ORST.EDU> kenneke@jacobs.cs.orst.edu >> Is there any humanly possible way of exceeding 1200 baud on a C64? I have tried many terminal programs, and none has worked. Any information would help me out tremendously. I have had the (dis)pleasure of doing 2400 baud on a C-64. It's a tight fit, but the C-64 can BARELY do it. I still end up with about a 20% error rate on Xmodem transfers, however. The two terminal programs that I've used at 2400 baud on the C-64 are: Bobsterm Pro (a commercial package), and CCGMS, a public domain program that I downloaded from Q-LINK for comparison purposes. I've also heard that Laserterm and several others will do 2400 baud, but, I haven't found my PD terminals disks yet to test that out (a shame, that it ends up being cheaper downloading them again, than trying to find them in this gawdaweful mess!). > I was wondering if there is anyway to get 9600 baud of 19200 baud from >the Commodore 64? If so, who makes these modems? What other interfaces >must be purchased to make this complete? Will the phone lines handle these >communication rates? I have done 9600 baud with a C-64. BUT, it requires a special hardware UART. Last I heard, that particular project was in board layout stage from a small manufacturer in, err, ah, Louisiana. I don't know how much further it's gotten since I played with the wire-wrapped prototype, transferring files at 9600 baud between Amiga and C-64, though. I really doubt that it'll ever make it to market, except maybe as a project in the Transactor, because of the limitations of the C-64. The biggest problem is that 9600 baud is faster than the disk drive will go -- and this was using a Pet/IEEE drive (8-bit parallel bus, Skyles interface, instead of serial interface). Not to mention that screen display at 9600 baud is pretty impossible on a 1mhz 6502 (960 characters per second? hmm, that leaves, err, 100 cycles to input a character and display it). 2400 baud seems to be end-of-the-road as far as the C-64 is concerned. Good, I guess. When you're talking real modems, you might as well get a real computer to go with it (heck, an Amiga 500 with a geen-skeen makes an aweful nice terminal...). -- Eric Lee Green ..!{ames,decwrl,mit-eddie,osu-cis}!killer!elg Snail Mail P.O. Box 92191 Lafayette, LA 70509 "Is a dream a lie if it don't come true, or is it something worse?"