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There was a shift in the early to mid 90s of barrel connectors going from center negative to center positive, where most devices before that time had...

Ah, yes, enlightening. So it's actually a multiplexed data/address bus and one can *only* assume the address is valid while /ADS is active.

Epyx World Games is a booter, so you will not see any files on the disk when you look at it under DOS. Have you tried booting it on an appropriate...

I had the same thought. According to pages 17-18 in this PDF there is an address strobe line /ADS which goes low to indicate a valid address. I...

Strange. There used to be a stock number for the 6" bands--SF-6500, package of 50 (I have one such here). Perhaps a pleading to...

Thanks for pointing that out; I hadn't really considered that properly.

The board is a J-Mark Computer Corporation OPTI-495SX 3/486WB v1.1 and it has a 238 pin LIF Socket 2 for the 486 CPUs and a 387 LIF socket in the...

Thanks for the info. While I was waiting for replies I went ahead and ordered a Hayes 2400 bps modem, and a Konexx Acoustic Coupler. The Konexx...

Yes they did, as per VileR's link, but note that that's not what I was on about above. The Commodore 1084 I mentioned was at best semi-compatible...

If you use an acoustic coupler, you won't need a modem too. Mind you, the audio quality on many mobile networks is atrocious and iffy, so between...

yeah, I was eyeballing the lofi stuff. I have a 256k conventional RAM card here in this unit; I was wondering about designing up a combo 2M EMS +...

That's good. Give me a bit to think about this one--many of these things have been built with exactly this firmware, so it's got to be something...

It looks like a standard 2 MB expansion card. I can't read the chips so it might have a different capacity but 256 kbit chips would have been the...

Tex-Elec 2Mb ram card.

As for software, depending on ram installed we have Qmodem, Telix, and Procomm, not to mention Kermit.

Manuals can be sent as Media Mail at much lower cost: https://about.usps.com/notices/not121/not121_tech.htm

The DOS word processor I liked a lot was Professional Write 2.x. It has a good built in spiel cheekier. For text editing, I still like Useful...

If it is one of their Industrial Machines, the OS will likely take some finding (if it's still on there at all). Most Siemens stuff was heavily...

Yes, the probe EM4610 has a separate LED for pulse.

I have only used utsource occasionally: for obsolete stuff - so far no issues. I purchased two 6120s from them and they both work fine; I also got...

Well, Forth-in-ROM did find its way into the Open Firmware PCI (IEEE 1275) standard. Too often overlooked--a great idea.

I've got a 40 track single sided Tandon I picked up as part of lot of 5.25" floppies and I don't plan on ever using it. If anyone is interested, I'll...

To my knowledge there wasn't even a Forth development system in ROM for PC compatibles which should have been a natural. No oddball keyboard needed...

Couldn't those manuals just be dropped into a USPS medium box for $15.05?

Still in a holding pattern waiting on foam pads for the QX-16 Q601A keyboard. Not much I can do with the QX-16 until the keyboard is working. Working...

Eh, why not be different? If IBM could put APL360 in ROM on the 5100, why not APL in ROM on the 5150? Confuse the heck out of the BASIC people. :)

Guess I'll buy a 7815 and try it, dunno why else the output voltage would be jumping up

I don't know the NS32000 CPUs at all, but I'm not sure you can make any assumptions about the state of address lines in between the various control...