Recent content by Fastopen

Very thanks Fritz. Next project is to restore my childhood computer a NCR pc920 it, was a pc810 but upgraded to 386 20, on that time I used to work with a 20mb miniscribe 8225AT IDE format, but today is quite dificult to find one. My father bought an upgrade version a 8450AT ide drive. These...

Thanks Fritz, if you need any picture from case or plastics, let me to know. regards,

Final summary: - Fuse F2 burned. It generates no tension on bridge s2. - R2 16ohm 3W burned. - CR6 edge broken - R25 edge broken. - Video amplifier C4 1000pF 2KV capacitor broken DMV is up and running. I don't have a keyboard so I simulate keys with arduino using this project...

Awesome Fritz!...amazing person!!!. I have the exactly same damage 😲 Thanks you very much. I will upload pictures from the next steps...

news! seems to be the offender is fuse F2. Making a bridge on F2, heaters have tension, no image, but heaters has tension!. Seems to be that some over tension occurred during my stupid power on - power off- power on procedure. R2 was burned, and CR6 seems to be affected, can someone tell me...

Many thanks Fritz, with this diagram I can continue with more tests. Regards,

Thanks very much. I apreciate it a lot.

I dont see: DMV , volume one , page 2-26 . Voltage 107 V on bridge S4 ? Look at STM HW , volume2 , page A-1-41 ff on https://oldcomputers.dyndns.org/public/pub/rechner/ncr/dmv/manuals/ncr_dmv_system_technical_manual_hardware_(ger_bw_ocr).pdf

Hi fritzeflink, just translating german posts from Schroeder, he remarks about 107V "1. Die Hauptspannung von ca. 104V DC wird aus den ca. 60V AC des Ringkerntransformators erzeugt. Diese 104V sollten an der Federbrücke S4 auf der Platine anliegen." I've just check voltage on this, DC voltage...

Thanks Fritzeflink. I already have this manual, but only covers monochrome CRT, no color CRT diagrams. I will try to translate german posts

I had a working NCR DMV color CRT working until yesterday when I power on it, power down and power on again in the same 2 or 3 seconds, crt stopped working. You can see that power supply is ok, it start, but CRT filament is not glowing up. All technical diagrams for NCR DMV are for the...

Searching for a NCR decision mate V keyboard, if you have one to sell, please contact me. regards

hello, still have the conner?

Can someone help me with jumper settings for a SCSI future domain suppose 950 because chip label says "SCSI ROM BIOS 950 AT V7.0"??? I can not found any documentation on internet.

These card are the MFM controller board and the EGA / VGA video card that is plugged into the MFM controller in the PC8 and PC810 NCR computers