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Sounds good. If you have your pin assignments and/or schematics available, would be interested in trying that out sometime. Hope you decide to open source your code, will help others to learn from it. Good work.

My apologies for that, not my proudest moment when I fail to get back to someone. It fell into /dev/null apparently. Great work on the firmware though! I would be very interested in trying it out on the petdisk hardware. Starting from scratch is most likely a good approach - I'm not particularly...

Hello, PETdisk Max developer here. Definitely open to improvements on the device and firmware. Supporting different drive numbers on the same unit should be fairly simple. As mentioned here, it does currently default to 0, but adding supporting others would be, as they say, a small matter of...

Thanks, I will give that a try. Just odd since I'm almost certain I wrote that disk with this machine before.. even found the actual disk I wrote.

Another note - tried 2 more things. First, connected the 360k drive as the only drive (A:) and no change in results. Also tried swapping with a 1.2M 5.25" drive and ran the test. Same results for low density media where only the DD 250 kbps test passes, and for HD media, only the DD 500 kbps...

Interesting, I ran the test and only the "double-density at 250 kbps" test passed, the other two failed. Odd since I am pretty sure I've used this machine to write osborne SSSD disks before, although that was several years ago.

Hi, I was trying to help out by writing the SSSD boot image (O1SDSYS.IMD) so I could mail it over, but having some issues using ImageDisk to write the image on my DOS machine I had previously used for this purpose. This is a PC running DOS 6.22, with a 1.44M drive as A: and a 360K drive as B:. I...

Worked perfectly! Thanks

Thanks Dave! I will give this a try.

Hi all, Small programming question for the PET. The 'Diag Sense' line on the PET userport is connected to pin 9, PA7 on one of the 6520s. This line is an input by default, but the schematics I've seen indicate this line as bidirectional. Anyone know if it is possible to set this line as an...

BASIC 1.0 is not supported on either the original PETdisk or petdisk max, but 2.0 should work fine. Edge connector oxidation definitely happens, had that on a couple of different PETs. Also there is a useful basic program you can try, which does some simple checks which sometimes reveal problems...

I will put the original PETdisk firmware and information back up on my website for posterity as well.

Glad it is working for you now!

Looking to sell this Wang workstation, I believe the model number is 2246-C although the sticker is gone. I got this years ago intending to repair and do something with it but looks like we will be moving house soon and it's just too big and heavy to bring along. Current status: I don't see a...

Thanks, makes sense. That may point toward the 74LS156 itself having some problems. The output signal on those connected lines looked pretty bad, lots of activity near the middle of the logic voltage range.

Hello again, Have my model 1 almost working now, with exception of the L2 ROM board. This is a 3-chip board, version 1.2 roms. If I have the romulator z80 connected and replacing the address space 0x0000-0x2FFF, It boots and runs. I am wondering about how the ROM select actually works for the...

Looking for a CoCo 1 or 2, working or not, cosmetic condition not critical. Will pay for shipping to California, USA. Thanks.

Thanks very much, the operation was a success! I was able to extract the good version of the same character rom from the SDLTRS source code, although it was flipped L-R and bit shifted with respect to what I had. So took care of that and wrote 2 copies of the rom onto a 28C16. Wired it up with...

Thanks very much! Looks like it's in trs_chars.c in the stltrs code as you mentioned, I'll give it a look. Can tell if it's the correct version of what I have by making a diff image between the two, will see how that goes.

Alternatively I suppose I can manually edit out all the dots in the bitmap and import that back into the right byte layout for the character ROM. But would be nice to just use the original contents.