Recent content by Sebastian

Bad solder or just a bad connection in the plug.

With horizontal lines and no bong, i think you can rule out the video-circuit. Vertical lines or bars would indicate VRAM or V-adress problems. Did you replace the RAM?

Well, an interesting night to be sure! I confirmed that the second batch of RAM was bad, because it caused a Simasi-mac installed alone or with the other RAM: Without it i got the question-mark After pulling out the HDD, i noticed it wasn't spinning up, so i opened it and helped it a bit...

A is populated, B is empty Question mark after i pushed a button, i checked and it was the interrupt button indeed, good call. When i reset after the sad-mac, i still get the sad mac. Trying to boot from SCSI hdd, no floppy here.

Today new video-RAM arrived (brand new), i soldered it in and got a ... ... ... Classic simasi-mac... Crap... (although it's a great improvement and tells me i was right in my diagnostic Well, then i removed half of the RAM and booted it again. I got this! That is cool! When i push the...

Thats why i generally just replace the caps without measuring, an ESR would cost me more than the few cents for the caps :D

did you measure the ram-sockets to the adress muxes?

Still: we need to acquire a Techstep and analyze the heck out of it. Makes life easier for everyone :)

I've ordered a usb-serial gizmo, will try the diagnostics as soon as it arrives (well, not exactly, i still have to wait for the VRAM...) But something seems a bit strange, the diagnostic-mode is triggered internally, on the PA0 line of VIA1. But what triggers the whole Techstep diagnostic...

Or with some modification, i assume one could run the SE30 video-circuit on a seperate clock.

I'm not knowledgeable about IIe's, but my reasoning is that if a lot of chips seem to fail, it's probably a fault in the adress-mux, the Row adress strobe or the Column adress strobe.

Huh?

Without videoram the inputs are floating and give lots of 'static' lines etc. The SE30's videocircuit is to be blunt quite dumb. It just starts reading the videoram and puts it on screen. Dank je wel ;)

Recently i acquired an SE30 from a colleague: After a brief inspection of the board for battery damage (no damage!) I hooked up the power and switched it on: Uh-Oh... Nice pattern for my wallpaper, but for a system a bit unpractical. Also i could very faintly hear the 'chime of death'...