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Re: UDC short mystery - 2 different cards that both hate my Apple 5 1/4" - Different revs?

On 2009-06-11 19:32:59 -0400, "atfphotography@gmail.com" <atfphotography@gmail.com> said: 


On Jun 11, 7:15�pm, David Wilson <mcs6...@gmail.com> wrote:

On Jun 12, 5:55�am, "atfphotogra...@gmail.com"

<atfphotogra...@gmail.com> wrote:

I was curious that my original "gold" card is missing parts from the
"green" card. Might it be a later version that didn't need those
parts? I also noticed the green had wire-wraps on the back.


Very interesting. My card is green but matches your gold card (no XTAL
and no wires on the back).


So I couldn't get anything but Apple 3.5" floppy drives to work on my
original UDC short "gold" card. When you put on a Apple 5 1/4" (NON
Unidisk) drive, it would first give out a very large "GRRRRR" and then
just spin the drive with the active light on. One them actually booted
after the roar but only worked once or twice.


I have never tried a "real" Apple 5.25 on my card (although now I do
have one and could try it if needed). I have a 40 track "Super 5"
brand half height 5.25" drive connected to mine via a homemade D19 to
IDC20 cable. I also ran a Macintosh 800k drive (the rectangular cased
no eject button unit) but the performance was poor and I eventually
got a couple of Apple 3.5 drives which work much better.


Maybe picking up the updated BIOS from reactive?


That firmware just changes the 5.25" ProDOS block device support from
35 tracks (280 blocks) to 40 tracks (320 blocks).

It would be interesting to know if your two cards have different
firmware versions - can you dump the ROMs and compare the contents?


Hello,

I would be delighted to be able to dump the ROMS, but I don't know
how! I really must learn how to make ROMs. It would be easier for
testing all sorts of odd things here.

Any suggestions for reading up and what sort of low cost equipment for
it?

I was looking at the ROM images on reactive for download but I have no
idea which chips I need to program them onto and which USB based
writer would be good.

If you ever get a chance to try any other drives on your card, please
let us know how it goes. Not a big deal but I was hoping to drive both
Apple 5 1/4" and Apple 800k drives on one machine with the card.

Best!

ATF


I thought I read somewhere that you can't chain drives on a UDC.

]3ob