Xref: utzoo comp.sys.apple2:3317 comp.os.cpm:3873 Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!mailrus!iuvax!purdue!haven!mimsy!mojo!cyliao From: cyliao@eng.umd.edu (Chun-Yao Liao) Newsgroups: comp.sys.apple2,comp.os.cpm Subject: Re: Apple can't keep up with 2400 baud Message-ID: <1990Jul1.202857.22014@eng.umd.edu> Date: 1 Jul 90 20:28:57 GMT References: Sender: news@eng.umd.edu (The News System) Organization: College of Engineering, Maryversity of Uniland, College Park Lines: 23 In article pnakada@oracle.com (Paul Nakada) writes: >I think the problem is that the display is disabling interrupts during >the scroll, which can cause loss of characters via the serial port. >It's not so much the speed of the CPU or the card, but more of the >interrupt handling. This is all conjecture, but it is my impression >that a 4 mhz Apple ][ should have no problem keeping up with 2400 cps. > Just curious about the difference between Apple II and //c... My //c had no problem to catch up with 2400 cps at 1 MHz, and when I pumped up my //c to 8 MHz, it even keep up with HST dual 9600 baud without TSR and DSR connected. ( and my //c is actually communicating at 19200 baud with the modem!) To the guy who posted the original article, did you set your ZipChip to catch the slot where the 80 column card is located? -- cyliao@wam.umd.edu o NeXT : I put main frame power on two chips. @epsl.umd.edu o people: We put main flame power on two guys. @bagend.eng.umd.edu o :::::::::::::::::::::::::::::::::::::::::::: xxxxx@xxxxx.xxx.xxx (reserved) o RC + Apple // + Classic Music + NeXT = cyliao