operator at coco3.com
Sat Dec 27 23:37:53 EST 2008
At 09:04 PM 12/27/2008, you wrote:
>From: "Roger Taylor" <operator at coco3.com>
>Booting and running OS-9 using a PC as the storage media is
>exciting. I would love to eliminate the floppies and that old hard
>drive. even if it wasn't any faster. The peace of mind would do the trick.
>I'm "Champing At The Bit" to see this happen.
>I'm curious, though. Would this bit banger driver slow the
>multitasking of OS9 down much?
>If so, would my RS-232 ports using the 6551 ease the CPU load?
>Holding my breath....
It's much faster than real floppies. Even when you use VERIFY ON to
write to the virtual disks, it writes and verifies quicker.
As for slowing down OS-9, I don't see it. An OS-9 CoCoNet
client/driver would do it's work when it is able and not butt in on
the system to block IRQ/FIRQ during the short blasts of 115200 bps
streams. Special care would be taken and a lot of testing.
I'm also an expert with the 6551 ACIA, so there's no reason why
support for RS-232 Paks or hacked DC Modem Paks, etc. couldn't at
least be put into the Disk BASIC version for starters. If someone
were to hack their Pak to fit a 28-pin socket (I've got a hacked ROM
Pak board that does this), just an RS-232 Pak could simulate a
virtual floppy controller for the CoCo with the DB-25 port being the
connection to the PC's DB-9.
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