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I found this attractive sketch on the back cover of a vintage Rockwell IC manual. Rockwell probably made a lot of electronics gear for the space...

To be honest, I don't think you get anywhere with your floppy issue without removing that SRAM expansion and try it with ordinary DRAM. I saw many...

Probably so. The SRAM board is now running with it's own parity generator, and it works well. No parity errors since this mod. The problem with...

Hi, I have a scrambled output on my Olivetti M24 monitor. It looks mostly like horizontal sync problem but not only. So I should focus on the...

Hi, I am looking again at my Olivetti M24 monitor. The video card is OK, because I got a signal on a VGA monitor, but the VGA monitor gives a...

SASI is basically SCSI before it was formally standardized. I used to use one of these with my Atari ST to connect an old 60Mb MFM drive to the...

Comitted this tonight, after running it through the palbart tests. I got mostly better answers than palbart, though apparently palbart handles...

Schematics of power supplies are as rare as snow in hell. You will be faster to make it run again by looking for another PSU with the same dimensions...

After adding the horizontal jumpers the M8650 works perfectly at addresses 40/41 and at 115200 bps the SerialDisk server works much nicer. I...

Sorry, I'm subscribed to this thread but I didn't get a notification for your post for some reason hwrdmltn. I've sent you a PM.

To add on to my prior reply: I have just finished replacing the rest of the electrolytic caps in the 5154. This has solved the wobbly sync when...

Ideally, mark and space voltages should be equal, but differing in sign, but as Hugo says, this was abused something awful. In the beginning, the...

So you have the Type 1 with the piggy back ram chips :-( I'm assuming it has the stock IBM bios, Can you burn your own Eproms if required ?, Do...

It is interesting the liberties some designers took with the power supply to the MC1488. In the Votrax TNT for example, they powered it from +12V and...

I grabbed it. will be archiving disk and manual on arrival

Looks like a ST-506 to sasi board. I think I used to have one, but I don't remember out of what.. Might have been a eagle computer? edit.. (I...

Could you not use a Tapduino? I thought the tape drive on a PET was the same interface as a Vic20?

it is an early OMTI Model 2001 MFM to SASI controller

What sort of failure or problem are you getting? What does libdsk expect for a raw image, and what disk geometry did you give it? Also, each track in...

Yeah. Oldskool 10mbit AUI+BNC though, not one of the newer 100mbit twisted pair cards. It was a neat machine, other than being kinda ratty. I'd...

It’s in a box marked SASI-HDC. Googling SASI suggests it was a predecessor for SCSI. What would this card be for?

Didn't that one have an ethernet card also?

They can leak pretty bad ... I have a couple of quadboards with bad traces due to battery leakage. The traces are very fine on these boards and it...

It's interesting that I can't get "k10u-rld-h.raw" or "k10u-rld-h-fmt.raw" to write an image with libdsk's dsktrans, SAMDISK, or BIN2IMD. Nothing...

Thank you Doug!!! I am obviously blind. :-( Now that you pointed out the horizontal jumpers I wonder how I missed them. I prefer the M8650...