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I have an IBM PC 5150 (model B) equipped with an IBM monochrome monitor 5151 and a VEGA Deluxe video card by Video Seven. I have set the VEGA card switches from sw1 to sw5 as off, off, on, off, on The toggle switch on the card is set to the right Dip switch 5 and 6 on the IBM 5150 motherboard...

The color on my VIC-20 is going in and out, I adjusted C3 to regain it but it is not stable and a little finger pressure on C3 is enough to affect the color. Now when I turn the VIC-20 on, it has color but then I played with the computer for 10 minutes and it goes to black and white. I turn the...

Is it correct to assume that the Horizon images wouldn't work on a N*Advantage 8/16?

So it appears that drive A may have some marginal alignments issues, but I need to do further testing to really diagnose the issue. Sometimes it runs a disk, sometimes it doesn't. Drive B on the other hand seems to be reading everything well and this consistently. I may just swap Drive A and...

Thank you very much, I will be testing this soon!

Hello group. I am catching up on this thread and I am very interested to see the progress that has been made using flashfloppy with the Northstar Advantage. I just restored a Northstar Advantage 8/16 and would love to use my Gotek Flashfloppy or my Lotharek with it. Is this possible now? And...

Thanks! I removed all the foam pads from the keyboard, they were crumbling. I still had a couple of foam & foil pads from TexElec (I ordered more) and I installed one for the return key. Now when I press return, the drive spins for a few seconds but then stops with a beep. Nothing other than...

I received a Northstar Advantage 8/16 today with plenty of original documentation and software. The computer, although a bit dusty inside and out, still looks great. When I turn on the computer, it powers up, beeps, and displays "LOAD SYSTEM" on the monitor. The foam keypads are shot so the...

resolved: the issue ended up being the LAG IC on the logic board!

Update: so with a given analog board that works with a Mac Plus logic board, I still get a “bong” following by the flupping with the Mac 128 logic board. However if I plug in the disk drive, the flupping stops but the screen is all black. If I insert a disk or the external floppy emu, the...

So I have tested three analog boards with a mac plus logic board and they all work. The mac 128 logic board however does not work with any of them. I no longer get a bong, it goes straight to “flupping”.

Where would be the test points for the voltages?

I am looking for assistance with a Mac 128K. At start up I get the « bong » but it’s followed by a repetitive « flup, flup, flup » sounds and nothing on the screen. The analog board works as I have used it with another logic board (Mac Plus). Hence I believe that the problem is with the logic...

You are right, I had missed it. I will see if it works. I am also recapping the whole board.

@daver2 thanks for helping. The numbering system on my model 16 video board is very different and I can’t seem to locate the vertical linearity pot. See picture below. Any thoughts?

The height of the rows of characters on the screen seem to be the smallest at the top of the screen and it increases with each successive row down to the bottom of the screen. As a result the characters at the top are a lot shorter than the characters at the bottom of the screen. What can I do...

I spent quite a bit of time on this setup yesterday (until 3am!) and continued to work through a process of elimination. First I soldered a 34 pin connector on the FDC board to avoid the need for the 50-to-34 pin adapter. That modification worked but did not fix the issue. The last possible...

unfortunately when I try the .hfe I still first get the "64k memory" in the center of the screen, followed by "initializing" in the top left corner of the screen and then nothing else.

With Lotharek I believe that my only option is to convert the .imd to .hfe, I don’t think that I can use the .imd directly.