Steve Toner's latest activity

Hmmm... there are 6 +5V pins, so in theory 36A spread across those 6 pins (100% connector loading) is within spec (should be good to...

OK, the connectors are rated at 11 amps: I derate this by 50%, and 2 wires should be sufficient to carry the 8A maximum that the power...

There's a fan. You can see the power leads to it in the interior view photo. The power supply can only supply a maximum of 8A@5V, so...

...and while I wait for my USB JTAG programming cable to arrive so I can program the CPLDs on the RLV12 emulator, I'm stuck loading code...

I recently acquired a KDJ11-DB board which appears to be from 1991, based on the date codes on the chips. Put it together with an...

I'm having a hard time understanding what the kerfuffle is about. According to amichlin on the Hacker News site linked in #3:

I don't recognize it, but it appears to be an Able Computer QNIVERTER which "Permits a [Qbus] system to access Unibus compatible...

http://15khz.wikidot.com/ Note that several NEC monitors do support 15KHz horizontal, even though the manual says it doesn't. And many...

Ouch! FWIW, the BA11-S Field Maintenance Print Set shows it correctly:

Does it run CP/M?

An M8047 will give you two serial ports plus sockets for bootstrap ROMs and a crystal-derived LTC clock (which you can disable). It...

Never mind that it says PDP-11/53 in this image - it's the same front panel (at least functionality-wise).

It could be something other than the RAM chips, but the 240s are not in the path between the RAM and the CPU. In fact, there's a direct...

Have you tried this?

I think you're going about it the hard way. The goal is to find the bad RAM chip, is it not? We know it's in the lowest 512KB, and...