Article View: comp.sys.ibm.pc.hardware.comm
Article #191Re: q:RS232 on a CBM64
From: Martin Lenz
Date: Fri, 17 Mar 1995 16:58
Date: Fri, 17 Mar 1995 16:58
27 lines
2676 bytes
2676 bytes
Jerzy Tarasiuk (jt@fuw.edu.pl) wrote:
: >>>>> "R" == Robert R Radina <radina@vulcan.inlink.com> writes:
: R> ktra93@control.auc.dk (K Xoeterix) wrote:
: R> : I would like to connect my PC to my Commodore 64 through a RS232-link.
: R> : Has anybody tried this before? Is there anything weird I should
: R> : know about doing this? For instance, what voltage levels does the
: R> : PC's serial port use (CBM64 uses TTL) ?
: R> I didn't know the CBM64 had a serial port. I know it has the "serial"
: R> disk-drive/printer daisy chain port, but I don't think this is RS232
: The Commodore may have something less sophisticated than PC's 8250
: chip - seems it has 8-bit shift register. Note the 8250 recognizes
[description of 8250 / RS232 deleted]
Yes the cbm64 has a shift register but it doesnt use it to emulate rs232
protocols. It just emulates it with some port lines and alot of software
polling, therefore even 4800 baud need some assembly language tricks and
are not implemented in the operating system.
--
("`-''-/").___..--''"`-._
`6_ 6 ) `-. ( ).`-.__.`) Waiting for mice to come!!!
(_Y_.)' ._ ) `._ `. ``-..-' :) .) :)
_..`--'_..-_/ /--'_.' ,'
(il),-'' (li),' ((!.-'
Technical Details
Message-ID:
<3kcf4g$agn@news.tuwien.ac.at>Path:
arc1-ca.pugleaf.net!bga.com!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!swidir.switch.ch!newsfeed.ACO.net!news.tuwien.ac.at!stud1.tuwien.ac.at!e8925685References:
<3k1ckr$si4@news.iesd.auc.dk> <3k84lt$lsr@thor.inlink.com> <JT.95Mar17134047@albert5.fuw.edu.pl>Show Full Headers
Complete Article Headers
X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10d683,efeb94067a7f2c8a X-Google-Attributes: gid10d683,public X-Google-Thread: f53ba,efeb94067a7f2c8a X-Google-Attributes: gidf53ba,public X-Google-Thread: 105ed0,efeb94067a7f2c8a X-Google-Attributes: gid105ed0,public X-Google-Thread: f70d1,efeb94067a7f2c8a X-Google-Attributes: gidf70d1,public X-Google-Thread: 102bfa,efeb94067a7f2c8a X-Google-Attributes: gid102bfa,public X-Google-Thread: 10265e,efeb94067a7f2c8a X-Google-Attributes: gid10265e,public X-Google-Thread: 103cf4,efeb94067a7f2c8a X-Google-Attributes: gid103cf4,public X-Google-ArrivalTime: 1995-03-17 09:02:38 PST Path: arc1-ca.pugleaf.net!bga.com!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!swidir.switch.ch!newsfeed.ACO.net!news.tuwien.ac.at!stud1.tuwien.ac.at!e8925685 From: e8925685@stud1.tuwien.ac.at (Martin Lenz) Newsgroups: comp.sys.ibm.pc.hardware.comm,alt.comp.hardware.homebuilt,alt.msdos.programmer,aus.computers.ibm-pc,comp.ibm.pc.hardware,comp.ibm.pc.misc,comp.sys.ibm.pc.misc Subject: Re: q:RS232 on a CBM64 Date: 17 Mar 1995 16:58:56 GMT Organization: Vienna University of Technology, Austria Lines: 28 Message-ID: <3kcf4g$agn@news.tuwien.ac.at> References: <3k1ckr$si4@news.iesd.auc.dk> <3k84lt$lsr@thor.inlink.com> <JT.95Mar17134047@albert5.fuw.edu.pl> NNTP-Posting-Host: stud1.tuwien.ac.at X-Newsreader: TIN [version 1.2 PL2]