Recent content by MikeS

Ah, that's what that logo represents, the upside-down triangle with a 'D' in each corner. I have a Rev E board here with that delay line at IC19; a Rev D board has a version from Belfuse, a somewhat better known supplier of these chips, labelled 0447-0200-78 date code 8225 (curious, since the...

So do you have a good key?

I made one of these for my first PET but unfortunately I sold that one and don't have any notes; ISTR that it was a little simpler than what's proposed so far though, but I could be wrong. On my later PETs I used some dual-pole buttons that could have the trip point adjusted independently (they...

Indeed; I *think* I've also seen a Hitachi version of a 24-pin 64K 2364-compatible EPROM, but I've never been able to find it again, so it's probably just another symptom of my failing memory ;-) Philips also makes a 24-pin 64K EPROM (27HC641) but its pinout doesn't match either the 2564 types...

The connector on the video board is notorious for intermittent contact, as is the main power connector on the PET pcb and all the IC sockets.

IMO an edge connector pass-through would be more flexible (and also cheaper) than an IEEE version. If connecting another device or devices is an issue then presumably the user already has a PET to IEEE cable for that; if your pass-through were IEEE out then they'd probably need to also buy an...

... and you can have two different images in the same chip, selectable with pin 21. Another compatible chip despite being 28 pins is the versatile TI 2564 which can replace those non-JEDEC ROMs & EPROMS from 8 to 64Kb; the extra 4 pins are just used for programming & extra chip selects. And of...

Thanks, Chuck; guess I'll have to set up a 5.25" system.

Welcome to the Cromemco community! There's lots of documentation and system software available, as well as technical expertise, so you should have lots of fun. The CS-1 is one of the smaller Cromemco boxes; a little cramped and awkward to work on and as Roger mentioned quite noisy, but a nice...

What do driver.sys and drivparm effectively do? I assumed that one or the other could be used to override whatever the BIOS assumed but apparently there's more to it...

I'm not sure the source of the disk is important; the question is how to read a 360K 40 track 9 SPT MS-DOS format disk on a PC. It could just as well come from another PC.

Should be, but I don't see any request; don't know where they're going, but not to me ;-) I wonder if Marcus isn't getting them either. DM me with your email address and I'll get you checked in. Once you're a member you'll have to separately request access to the Github repository from Marcus...

You didn't say where you sent the request ? m

Where did you send the request? m

I think it's probably not feasible to read the drive on another system; the interface is completely different from ST506 or IDE and the format of the data on the disk will probably also be incompatible. Do you actually have a Synclavier working with that drive? If so, is there no way to export...