View Profile: Roland Huisman - Vintage Computer Forum

March 2nd, 2021, 11:00 AM

Roland Huisman replied to a thread What did I do to my PDP-8 today. in DEC

The transformer is a constant voltage model. It has a quite big air gap. That capacitor saturates the core which is limiting/regulating the output...

229 replies | 15896 view(s)

February 23rd, 2021, 12:47 PM

Roland Huisman replied to a thread Proper Linux for Compaq Proliant 2500 in Pentium (First generation)

Thanks a lot for all the tips and suggestions! I will try to get it up and running. All the batteries on the RAID card are still okay but I had to...

9 replies | 308 view(s)

February 23rd, 2021, 10:17 AM

Roland Huisman replied to a thread RX01 floppy drive adventures in DEC

I think DEC made several modifications to these drives. I have seen very interesting modifications to the RK05 drives as well... Cooling was one of...

40 replies | 2038 view(s)

February 20th, 2021, 03:07 PM

Roland Huisman started a thread Proper Linux for Compaq Proliant 2500 in Pentium (First generation)

In the late nineties I've installed several Compaq Proliant machines at the University where I worked back then. Because of the warm memories I...

9 replies | 308 view(s)

February 19th, 2021, 08:34 AM

Roland Huisman replied to a thread Digital GiGi VK100 colour graphics terminal in DEC

To be honest, I was wondering if it is worth the effort to edit the firmware which supports Tektronix data. But I think the source is not...

12 replies | 517 view(s)

February 17th, 2021, 01:13 PM

Roland Huisman replied to a thread Flip-Chip sell off in DEC

The last 8KW core stack which I bought on Ebay was June last year, 200 Dollar and I was the only bidder... Isn't that strange? I don't have a clue...

7 replies | 528 view(s)

February 15th, 2021, 11:35 AM

Roland Huisman started a thread Digital GiGi VK100 colour graphics terminal in DEC

Hello everyone, It seems there is a broken VK100 / GiGi terminal waiting for me to repair. But I had never heard about a GiGi before... The...

12 replies | 517 view(s)

February 15th, 2021, 09:24 AM

Roland Huisman replied to a thread RX01 floppy drive adventures in DEC

This is the reason why I use a primary RX controller at address 75 and a secondary controller at address 76. On 75 I have the RX emulator with an SD...

40 replies | 2038 view(s)

February 13th, 2021, 12:43 AM

Roland Huisman replied to a thread RX01 floppy drive adventures in DEC

Hi Tom, These voltages are fine. The +5V TTL will drop a bit under load when you connect the boards. The -5V is used for the opamps. A bit higher...

40 replies | 2038 view(s)

February 5th, 2021, 08:57 AM

Roland Huisman replied to a thread VT320 - Replace CRT with LCD? in DEC

Hi Tom, The last company which I knew about to rebuilt CRTs was RACS in France. I had a CRT from the thirties with an open heater. They repaired...

17 replies | 918 view(s)

February 5th, 2021, 04:01 AM

Roland Huisman replied to a thread VT320 - Replace CRT with LCD? in DEC

Too bad that I don't have a VT320 here, I really would like to figure out where the real problem is. I have years of experience with...

17 replies | 918 view(s)

February 4th, 2021, 02:52 AM

Roland Huisman replied to a thread Reality check - PDP-8/F on Ebay in DEC

The EAE expansion in a PDP8 Omnibus machine has also a little bit micro code. I don't know if there were also other expansions which used...

25 replies | 1205 view(s)

February 3rd, 2021, 04:29 AM

Roland Huisman replied to a thread Reality check - PDP-8/F on Ebay in DEC

Hi Tom, okay sorry! I interpreted that differently... Thanks for clearing that up. :D

25 replies | 1205 view(s)

February 3rd, 2021, 12:42 AM

Roland Huisman replied to a thread Reality check - PDP-8/F on Ebay in DEC

Remember, PDP machines were never intended to use at home. If a machine was outdated for the company it would be scrapped. Just a few people had fun...

25 replies | 1205 view(s)

Roland Huisman
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