C4P floppy issues

From: Dave <dfnr2_at_yahoo.com>
Date: Sat Oct 2 09:22:51 2004

--- Bill Sudbrink <wh.sudbrink_at_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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Received on Sat Oct 02 2004 - 09:22:51 BST

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