maniac@lil-ed.cs.unlv.edu (Eric J. Schwertfeger) (10/01/90)
I'm hoping that someone out there can answer a question for me. Can the standard amiga serial port, either through the serial.device, or through direct hardware access, do 8 bit syncronous transfers, with no start or stop bits? I don't think this can be done, but I'm willing to listen to anyone with an idea. The reason I ask is because I'm toying with the idea of writing an mnp.device, which will add mnp error detection and correction protocols to terminal programs transparently. The problem is, MNP level 3 requires syncronous comunications, and MNP level two only has an efficiency of about 84% if I remember right (MNP 3 gets 108%). Eric J. Schwertfeger, maniac@jimi.cs.unlv.edu
jms@tardis.Tymnet.COM (Joe Smith) (10/07/90)
In article <2024@jimi.cs.unlv.edu> maniac@lil-ed.cs.unlv.edu (Eric J. Schwertfeger) writes: > Can the standard amiga serial port, either through >the serial.device, or through direct hardware access, do >8 bit syncronous transfers, with no start or stop bits? From the RKM Hardware Manual: "Data will be moved out of the shift register, one bit during each time interval, starting with the least significant bit. The shifting continues until all 1 bits have been shifted out. Any number of combination of data and stop bits may be specified this way." But there must be at least one stop bit. If you load the registers with all zeros, no data will be sent, no interrupt will be generated. The Amiga's built-in serial port does not support sync. -- Joe Smith (408)922-6220 | SMTP: jms@tardis.tymnet.com or jms@gemini.tymnet.com BT Tymnet Tech Services | UUCP: ...!{ames,pyramid}!oliveb!tymix!tardis!jms PO Box 49019, MS-C41 | BIX: smithjoe | 12 PDP-10s still running! "POPJ P," San Jose, CA 95161-9019 | humorous dislaimer: "My Amiga 3000 speaks for me."
ben@epmooch.UUCP (Rev. Ben A. Mesander) (10/08/90)
>In article <1277@tardis.Tymnet.COM> jms@tardis.Tymnet.COM (Joe Smith) writes: >In article <2024@jimi.cs.unlv.edu> maniac@lil-ed.cs.unlv.edu (Eric J. Schwertfeger) writes: >> Can the standard amiga serial port, either through >>the serial.device, or through direct hardware access, do >>8 bit syncronous transfers, with no start or stop bits? [details from the hardware RKM deleted] > >The Amiga's built-in serial port does not support sync. > If I remember right, there's a serial port of sorts on each of the CIA's. One is used for the keyboard, the other comes out as one of the pins on the parallel port. Is it possible to program these to run in syncronous mode? -- | ben@epmooch.UUCP (Ben Mesander) | "Cash is more important than | | ben%servalan.UUCP@uokmax.ecn.uoknor.edu | your mother." - Al Shugart, | | !chinet!uokmax!servalan!epmooch!ben | CEO, Seagate Technologies |