Recent content by TasKiNG

Just desoldered the Main Board / Keyboard electrolytic capacitors. They were in pretty bad condition i.e. values way out, electrically leaky and also a number had leaked electrolyte. Here's a record of the locations, polarity and values ( may help someone else in the future )

Having bought some Perkin Elmer 550 terminals I decided I needed something to connect them up to. When my place of work scrapped their Perkin Elmer 3210 computer 25 years ago I rescued the control panel. Well 25 years later and a Raspberry Pi can fit into the console so I decided it was time to...

@MindWalker Thanks for the info. Thats a nice looking board. Ah so they are voltage regulators not transistors. Looks quite a simple psu design :) On mine, one has some keys missing, one has a cracked case at the rear. and one has a broken tube (you can see the phospor missing on the middle...

Thanks @MindWalker for the link to the programming manual. The shield on the bottom was missing and it was a barn find so had had alsorts living in it so the boards were quite bad too. The list of electrolytics will be useful :) My main issue is with rust. I can't read the frequencies of the...

Anyone have a service manual or schematic for a Perkin Elmer 550 Terminal please? I'm about to restore one and it would make it a lot easier.

Thanks Dave, I've found the SB.SYS driver on one of my floppies. What I am after is the fortran GGS library for DMA control. I've almost written a GGS fortran library for serial control and it's working quite well :- Would still be interested to see your driver code though. Dave

Been trying to do this for a couple of days with no luck so wonder if someone can help me please.? I have a PDP11/73 running RT-11 5.3. (RT11XM.SYS). I am using a M8043 DLV11-J four port serial card (i.e. channels 0 to 3) with the console connected to Channel 3. From Fortran 77 I have no...

It's been a while but I have finally got around to having a play with my SBD display card. I found the SB.SYS and SBX.SYS RT-11 drivers for the card but I could not find the fortran libraries that would allow me to directly communicate with the card over the bus. Reading the documentation that...

I'm after a bit of advice please. Are the ribbons for the Decwriter 1,2 & 3 the same. i.e. Will ribbons described as for the LA36R work on the LA120 (Decwriter III).

I''ve got a 2007C 23-003C4 chip. Not got a clue if it's working or not but if it's any good to you then PM me your address and I'll post it to you.

I just got this PDP11/05 from work. It was stored in damp conditions so needs a lot of TLC.