Recent content by 9track

I used a slightly different approach to some of the guides online. Here is my approach for running a VAX 6000 on single phase in the UK. Inside the H405 power input box I have disconnected two of the outputs from the main contactor (yellow and brown wire) such that only one phase makes it...

I have all 3 versions of the power supply. The H7864 is made by Astec, copyright date 1982 Astec part number: AA12130 DEC part number: 30-20444-01 Rated at 320W input, 242W output. 5V @ 36A 12V @ 6A 10V/12V @ 0.45A (fan output) 12V @ 0.45A (fan output) The H7864-A is also made by Astec...

I used to have a scanner that would have worked quite well for these but my current scanner has a very short depth of field. Unless the object it pressed hard against the glass then it's out of focus. For these pictures I used my (very) home made light box, which is basically a cardboard box...

I also have a VT100 with the RetroGraphics enhancement however my board looks very different to the one that Roland has posted. Roland's board appears to have a copyright date of 1981 whereas my board has a date of 1983. Dump of the ROMs: 0561Y1_45E0 (U33) 0561Y2_E598 (U34) 0561Y3_0BE2 (U35)...

I've created a partial schematic for some of the components of the H7100 not covered in the VAX-11/750 print set. H7100 Bias/Control Board H7100 Front Panel There's still quite a bit missing and they could be drawn better but it was enough to help me fix my H7100 power supplies. I also have a...

Schematics for the H7206 and H7215 (but not the H7214) are in the VAX 6400 engineering drawings. I am running a VAX 6440 from a single phase supply. Well, I suppose it's a VAX 6430 now as one of the CPUs stopped working recently.