Recent content by vrs42

I've been working on the regression tests for the model-specific PDP-8 SIMH. The discussion I've found about the PDP-5 acceptance/testing make reference to maindec-501-xx, describing them as similar to the later maindec-801-xx. Do any of these survive? I've been making do by hacking up...

Even if he can get the correct handler binary built and copied onto his system, I think he also needs a correct version of BUILD.SV to install it.

OK. if I haven't broken the code and 41% is plausible, should we rework the code to get back to a single version that determines which clock to use at runtime? I noticed that the clock detection code incorrectly detected a clock (I forget which), and didn't default to "no clock" like I expected...

It's unclear to me how to interpret the results. With SR=0, I think it does one outer loop and 07700 inner loops. And that takes 5.8 seconds. I don't actually have any idea what a Dhrystone is or how these loop counts relate to that. Aside from that, it looks like I'm getting counts near...

No worries. I was hoping that was it. Hopefully with the spacers there's enough room to do what you want to do without getting the bulb too close to the Perspex. Sorry to hear about your mom.

FWIW, here's my hacked up source code.

OK, I think I got somewhere with the Dhrystone test. I hacked up an ISR and an initialization routine for my DK8-EC, which is jumpered for 50 Hz. I did note that even without the clock installed, one tick is counted. I believe this is because the teleprinter flag caused an interrupt. Anyway, I...

I'm a bulb purist, but I'll note that, in the operating range most of these bulbs live in most of the time (especially if long bulb life was desired), yellow is probably the correct color of LED to use, not "warm white".

That's been done, over at https://svn.so-much-stuff.com/svn/trunk/Eagle/projects/DEC/PDP8S. To answer the question, I've traced over 100dpi images, which usually works OK. If the image contrast is poor, then I sometimes prefer higher resolution to figure out what I'm looking at without refering...

OK. It took me a bit of looking, but I managed to locate my 8/S, and the spare 8/S front panel. The spare panel has been reworked with BPR bulbs. The PCB should be about 3/8" off the back of the light shield, held off by metal spacers/bushings. That places the light shield over the glass bit of...

The bi-pin bulbs (or the BPR bulbs) are *so* much nicer than the crappy bare-lead bulbs. It's a sort of "plausible period correct upgrade", if you're trying to justify not keeping it original. I also lean toward using machine pin sockets (of the sort used with ICs), so that the dicey soldering...

Also available here: https://svn.so-much-stuff.com/svn/trunk/pdp8/src/dec/maindec-08-dilac/ https://so-much-stuff.com/pdp8/software/dec.php PAL source, Rev. A and Rev B paper tape images, and Rev. B documentation. (In case someone hasn't got a working RX01 handy.)

There's a painting tool, so you don't need to edit the G-code directly. Basically, the tool allows you to color a face, which is why the lettering is either recessed or raised. Otherwise the import wants to combine the co-planar surface, and there's nothing left to color.

Not sure who this was addressed to, but my print profile is colored. I do not know of a way to get colors from OpenSCAD directly into the Bambu tools or OrcaSlicer. AFAIK, you have to import the thing and then color it. Thereafter, you can save the print profile to just reopen and print as...

I tried to run this, but don't have a dk8p or dk8s running. I tried to port to the dk8a, but it looks like the code stomps locations 1-5, where I wanted to put interrupt handling for the clock.