Recent content by Callan

Foldover and vertical compression like that is usually indicative of a cap out of tolerance. It could just be coincidence, but since your problem didn't appear until you replaced the pots I would check their resistence first. Problems always have a funny way of being at the last place we...

I'm not a lisa expert, but that looks like you have bad caps on your monitor chassis. Your probably gonna have to cap the monitor. That or go through the chassis with an esr meter and see if you can find the bad caps/cap. I'd start in the vertical deflection section.

That or I'd pull the transformer and verify it's bad with an lopt tester. They used to sell a cheap kit you could build (dick smith)

Can't do that. That's a center tap and it's feeding both sides of the outputs. If your looking for a transformer you'd be better off buying this... https://tinyurl.com/2a7u9cee

Welcome to the site! I was one of those 129 so I apologize. I actually started watching your Javascript script stream and forgot to come back to say howdy. I too haven't programmed in Pascal since high school, so I probably won't be any help. My pacman chops were lacking (great port btw!)...

You could use a logic probe to verify activity. You just want to make sure your pins are getting data from the swim. If your in my area I'd be happy to help. In the interim you could just build your drive images on another machin, but i would really miss my floppy emu. And... since you...

I'm wondering if someone cut that trace on purpose. Hmm Scope time. Verify each of your pins are correct (sounds like you've done that). Verify all voltage and gnd pins are good. Verify your enable line is right (active low) and that read data has activity.same with all the other lines After...

You can desoldrr the header pins, or... if you don't care about looks you can just run a jumper from the inductor from the top of the board to the bottom of the board. It would be a long run, but easy to do.

Cool. Looking forward to trying it. Thanks!

That's fine. It.say kernal okay on an unenhanced iie (doesn't have the upgraded processor). Your sound problem could be as simple as a bad speaker or it's just not plugged in. Make sure the 2 pin connector is seated correctly on the speaker out pins (look under the keyboard)

And the other works fine on this monitor?

That looks like your computer is working, but you have a horizontal sync issue. Not sure if it's your monitor. Look for the hsync adjustment on the monitor. That or you could get one of those apple to vga cards and just run it on a vga monitor

If your getting 4.46 at your 5volt rail for the whole board I'm surprised everything but your floppy is working. Something is pulling your rail down or your power supply isn't able to supply the current needs of the board. Iifx expert anyone?

Use the vertical adjustment and see if you can make the image a little bigger. It should drop the center down.

Just read an article on compact tubes and you should be good on yoke compatibility, but since you changed your caps I would definetly verify the vertical and horizontal adjustments first.