retrogear's latest activity

I've ordered a motherboard upgrade from the Lifeline site - looking forward to giving that a try. I cant help feeling that these systems...

adjust the horizontal hold VR4005 to get the bars running vertical instead of diagonal. If they don't lock but just float across then...

There are several possibilities including a short on the grid or cathode of the tube (hopefully not) but the more common is the loss of...

That photo was using composite which is B/W only. I have used a level converter board plugged into CGA out then wired into a GBS8200...

I know. It also was graciously given to me by another individual in this group a decade ago. It has an NEC FD1165. I can unplug it and...

It's a fun machine. I added a Seagate ST-225 hard drive and an 8" floppy drive to mine. The floppy card has a 50 pin header for it. My...

circled in yellow

the cap Andy referenced is C423 near the flyback which is also a likely area for breaking a trace

there are bios calls for set source/destination banks then another call for block move. There is a call for select bank for code...

If you repeatedly tap the F2 key after power on you can't get to the bios ?

I had a report of a bad 74LS02 at B13. That creates the timing window for color burst. No burst = no color. Larry G

Looking thru the UTS-30 manual that gives the files released on the disk for CP/M Plus Release 1R1 contained no SPR files, only CPM3.SYS...

You should just be able to use the stock BNKBDOS / RESBDOS SPR files distributed by DRI.

<It sounds as if you're having to rebuild the BDOS so the resbdos$pg ends up as the address the BDOS will actually be loaded at, rather...

It sounds as if you're having to rebuild the BDOS so the resbdos$pg ends up as the address the BDOS will actually be loaded at, rather...