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- Path: sparky!uunet!comp.vuw.ac.nz!newshost.wcc.govt.nz!kosmos.wcc.govt.nz!mcmillan_a
- From: mcmillan_a@kosmos.wcc.govt.nz
- Newsgroups: comp.sys.cbm
- Subject: Re: null modem for C64: help needed
- Date: 12 Jan 93 01:16:14 NZST
- Organization: Welligton City Council, Public Access.
- Lines: 35
- Distribution: usa
- Message-ID: <1993Jan12.011614.1@kosmos.wcc.govt.nz>
- References: <1993Jan8.150705.17077@cbnewse.cb.att.com>
- NNTP-Posting-Host: kosmos.wcc.govt.nz
-
- In article <1993Jan8.150705.17077@cbnewse.cb.att.com>, liuzzo@cbnewse.cb.att.com (james.g.liuzzo) writes:
- > I need to download some files to my C64. A friend suggested that
- > rather than buying a modem for my C64, I download the files to my
- > Macintosh (which has a modem), and then use xmodem to transfer them
- > from the Mac to the 64 over a null modem cable.
-
- There a now a number of C64 terms which will let you use more efficient
- protocols than xmodem.
-
- > After digging out my C64 Programmer's Manual, it looks like the
- > xmit and receive lines on the C64 user port need to be converted from
- > 5 to 12 volts for the null modem cable. Then it looks like it's just
- > a matter of connecting xmit and receive (crossing them) and ground
- > to the Mac port.
-
- You are exactly right! There are some commercial interfaces available
- at a price. All that is needed are 4 capacitors, 4 diodes, 1 1488 ic
- and 1 1489 ic, plus connectors.
-
- > Have I got this right? Assuming this works, at what speed could I
- > transfer files across the 2 machines? Any other considerations I should
- > know about?
-
- I have a 128 and can null modem (with Desterm) to my pc at 9600 baud. On a
- 64 you might find 2400 is the fastest. (Try Novaterm 9.4)
- You'll also need to translate PETASCII text files to ASCII... I found no
- pc proram that would do that simple task, so wrote one using QuickBasic 4.5,
- which anyone is welcome to... but I don't know if it would run on a mac.
-
- How compatible is the mac with a pc?? There's a wee gem of a program called
- x1541.exe which lets you copy straight to a 1541 from a pc. Available from
- ccosun.caltech.edu pub/rknop/INCOMING.
-
- Cheers - Kirk
-
-