Path: utzoo!mnetor!uunet!husc6!bbn!uwmcsd1!ig!jade!ucbvax!hplabs!gatech!dcatla!mclek From: mclek@dcatla.UUCP (Larry E. Kollar) Newsgroups: comp.sys.cbm Subject: Re: C-128 CP/M UART support Message-ID: <2475@dcatla.UUCP> Date: 11 Dec 87 03:19:08 GMT References: <2404@killer.UUCP> Reply-To: mclek@dcatla.UUCP (Larry E. Kollar) Organization: DCA Inc., Alpharetta, GA Lines: 39 In article <2404@killer.UUCP> elg@killer.UUCP (Eric Green) writes: >I've been playing with the C-128's CP/M since getting a 1750 RAM expander. One >thing I absolutely hate about it is that modem I/O is so slow and unreliable. I'm using it right now, to read this newsgroup. For the last 20 minutes or so, I've been downloading things. No problems, and the 1750 works just fine. Of course, I'm going 300 bps with MEX. >I notice in the [DEVICE] list that there's a 6551 ACIA listed as a choice. >That 6551 obviously must be in block 1, since the RAM expander is in block 2. The following, reprinted w/o permission from Compute's "Mapping the C128," may explain. On page 493, describing addresses $de00-$deff: The original releases of CP/M (those dated prior to December 6, 1985) expect to find a UART chip here for RS-232 serial communications, which is why the RS-232 portion of those versions doesn't work. No expansion card with a UART at this address was ever introduced, and more recent versions of CP/M properly support RS-232 communications in the standard fashion (via software). I have a Dec. 8 version of CP/M, with the 1581 patch from the November issue of Transactor. My only gripe is that MEX can't handle my keyboard input as fast as I like to type. >(BTW, Fred, pass this on to the DevPACK people -- WE WANT OUR DEVPACS!!!). YEAH!!!!!!! While I got y'all's attention, why does Power-C 128 like to generate "Syntax Errors" on what appears to be perfectly good code? I'd be happy to post or mail fragments where it's been giving me grief. While the lack of copy-protection and the ability to generate standalone prgs convince me that Power-C is the way to go, Abacus is sure a LOT less fussy (and it supports the 1750 as well). Larry Kollar ...!gatech!dcatla!mclek My cats have their own opinions. My dog, however, agrees with anything I say.