23 Sep
2004
23 Sep
'04
2:29 p.m.
Hello,
A friend gave me his first computer to go in my collection.
Its a Challenger C4P. I do have the original manuals etc.
And of course my friend for information.
What I am looking for however is additional information,
websites etc devoted to it. I have the cassette based
version. The first question would be details on the
floppy disk version. IE can I upgrade mine. If not,
sources for programs for the cassette based unit.
Also I remember a program to simulate the cassette player
by using a PC with a sound card. Any one know if that one?
Or should I just make wav files and use media player?
For one thing, I would like a terminal emulation
program for it.
Thanks
Max at
23 Sep
23 Sep
1:12 p.m.
New subject: Ohio Scientific website (was Re: (no subject))
On Thu, 23 Sep 2004, Keith wrote:
What I am looking for however is additional
information,
websites etc devoted to it. I have the cassette based
http://www.vintage.org/links.php#159
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2:12 p.m.
New subject: C4P floppy issues
A friend gave me his first computer to go in my
collection.
Its a Challenger C4P. I do have the original manuals etc.
And of course my friend for information.
What I am looking for however is additional information,
websites etc devoted to it. I have the cassette based
version. The first question would be details on the
floppy disk version. IE can I upgrade mine. If not,
sources for programs for the cassette based unit.
You might think that you could just add a floppy interface
board and have a C4P-MF. Nope, afraid not. The floppy
controller is integrated into the CPU card in the C4P-MF.
That CPU card is a 505. On a non-MF C4P, the CPU is a 502.
On the 502, instead of the floppy interface, there is Micro$oft
8K BASIC in ROM and the cassette port (the C4P-MF does NOT have
a cassette port). One possibility to get cassette functionality
on a C4P(non-MF) would be to hack up a 470 board... but you
would then also have to re-do the monitor ROM, as the boot
loader code in the C4P monitor (according to rumor) doesn't
work anyway. Might have something to do with addressing conflicts
with the cassette port. Finally, there are issues with the
OS (usually OS-65D) expecting/not expecting to see BASIC in ROM.
I think if it sees it, it figures that it is running on a C1P
and you get funny results if you are not (keyboard issues maybe?
I'd have to look through some old PEEK65s to check).
2:20 p.m.
New subject: C4P floppy issues
A friend gave
me his first computer to go in my collection.
Its a Challenger C4P. I do have the original manuals etc.
And of course my friend for information.
What I am looking for however is additional information,
websites etc devoted to it. I have the cassette based
version. The first question would be details on the
floppy disk version. IE can I upgrade mine. If not,
sources for programs for the cassette based unit.
You might think that you could just add a floppy interface
board and have a C4P-MF. Nope, afraid not. The floppy
controller is integrated into the CPU card in the C4P-MF.
That CPU card is a 505. On a non-MF C4P, the CPU is a 502.
On the 502, instead of the floppy interface, there is Micro$oft
8K BASIC in ROM and the cassette port (the C4P-MF does NOT have
a cassette port). One possibility to get cassette functionality on a C4P(non-MF) would be to hack up a 470 board...
but you
would then also have to re-do the monitor ROM, as the boot
loader code in the C4P monitor (according to rumor) doesn't
work anyway. Might have something to do with addressing conflicts
with the cassette port. Finally, there are issues with the
OS (usually OS-65D) expecting/not expecting to see BASIC in ROM.
I think if it sees it, it figures that it is running on a C1P
and you get funny results if you are not (keyboard issues maybe?
I'd have to look through some old PEEK65s to check).
2 Oct
2 Oct
2:22 a.m.
New subject: C4P floppy issues
--- Bill Sudbrink <wh.sudbrink(a)verizon.net> wrote:
(Use a 470 board for disk interfacing, but)
would then also have to re-do the monitor ROM, as
the boot loader code in the C4P monitor (according
to rumor)
doesn't work anyway.
Actually, the floppy circuit on the 505 is identical
to the 470. Before the 505, all floppy machines had a
470 board. The bank-select jumpers from the ROM will
have to be reconfigured, since either the floppy or
ROM-basic boot section is mapped to 0000H. I think I
have some docs on this on my web site, and would be
willing to help out with advice or instructions.
There is no conflict with the cassette port--it's just
some analog electronics on the same serial port that
the 505 has. In fact, the 540 video board also had a
"cassette port", just the KCS modulation circuitry
that hooked into a regular serial interface.
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