Uniballer's latest activity

There's a lot of strange stuff in the food industry. Take peanut butter. Ordinary (not the organic pricey stuff) has the peanut oil...

Haven't bought stuff recently but can give a little info on things to investigate. Name brand older equipment can have better...

This. It's amazing that a large number of LAs on that auction site advertised as "working" come with no pods. What good are they...

There is an active Emacs for DOS project, which includes shelling out to DOS. You should be able to use that.

I remember comparing 33 MHz 386DX and 486DX systems running UNIX (so both were running identical 32 bit code) and the 486 took half the...

ok folks! good news! I got it to boot! I tried to check the cables, but I didn't get far because they aren't visible from the back...

Now that you fixed the broken grant chain the boot firmware can tell that the disk controller can issue IRQs and perform DMA in/out of...

The RX50 floppies are DU devices (if my brain doesn't deceive me). RX01/RX02 drives are big and heavy 8" jobs with a special...

M8639 is probably an RQDX1 (could it be an RQDX2?). You need XXDP diagnostics system on RX50 diskettes so you can try to boot them. I...

I bought a fully populated PB16H rack on ebay for cheap (in 2009?), and made a cable to run from the 50-pin header to a DB25, wired to...

No, it actually increases the current that the transistor has to sink because it's in parallel with the 330 ohm bus terminating pullup...

Yeah, well, it's complicated... DEC treats the Qbus as a transmission line, and it's terminated (at least in the case of the 9278...

I've only ever used DSDD disks as RX50 replacements. They seem to initialize fine under MS-DOS.

Could be a 74181 - see PDF p 114 here U6N934151X. The AMD 9xxx series is a licensed version of the original Fairchild.

Which is the option that Intel took with the 8086 assembler. Something like: JZ SHORT FRED or something like: JZ.S FRED (as an...