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- From: orban@ciit85.ciit.nrc.ca
- Newsgroups: comp.os.cpm
- Subject: Fun with Osborne hardware
- Message-ID: <1992Jul27.150438.1182@ciit85.ciit.nrc.ca>
- Date: 27 Jul 92 15:04:38 +0600
- Organization: National Research Council
- Lines: 33
-
- Hi fellow netters,
-
- I have an Osborne IB, with the double density drives. It served me
- well, mainly doing word processing on it.
- As the built in monitor is too small on it, I hooked up a PC monitor to
- it. I have heard about the 80 column conversion, and as I had the
- technical manual to the machine, I designed and built a conversion.
- It worked all right, except due to the longer lines the display
- slowed down, and the screen was flickering, so I converted it back.
- Has anyone tryed that? Was it flickering? Would I need another monitor
- with a longer persistance phosphor? I take, you would not speed up
- the machine, mainly because of the disk drives.
- I had problems with my disk drives. They would fail after about 2 ~ 3
- hours of use. Turning the machine off and letting it cool dawn would help.
- First I installed a fan, into the back of the machine, where the handle
- is. This helped a bit, but every now and then the disk drives still failed.
- Finally, I redesigned the floppy interface, with a single chip PLL
- data separator and PC disk drives, doing away with the Osborne data
- separator board and drives. Unfortunately it does not boot (nothing
- works at first). I would need to write short routines to test the
- different functions of the floppy controller/drive. And here comes the
- catch: I have a later style monitor program in the Osborne, which does
- not have the test mode, where you could dawn-load test programs into the
- RAM and run it. I would need to have an older monitor, or the source
- listing on a computer to modify it.
- Anyone has any of those?
- Any help would be appreciated!
-
- Thanks, Peter
- --
- Peter Orban | preferred: orban@ciit85.ciit.nrc.ca
- National Research Council of Canada | or: orban@nrcamt.nrc.ca
-
-