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...
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 was given this QBUS board today but have googled it and cannot find any info on it.
It is a 68000 based board with memory, Eproms & I/O.
Would like to know what it was used for and if it would be compatible with any PDP11 Qbus cards.
Here's some pics:-
Last week I rescued another computer from the skip (dumpster) at work.
This time it was a PDP11/23 Plus.
I don't think it has been turned on for 20 or so years but I've just tried it and it booted up first time.
Fans are a little bit noisy and one of the floppy drives don't work properly but was...