Patch work on a1k WCS board

[koaftder]

I recently acquired an a1k off ebay and I found this patch work on the WCS board. I have never seen this done any any other a1k, what is it for? The main board is Rev A. Though the case doesn't look any better than the others I have, this is absolutely the cleanest A1k I've ever seen and the floppy drive doesn't even make any noise and it doesn't give me random read errors. It was a pleasant surprise to find an accelerator in there, I was not expecting that.

Also, does anybody have information on the grounding fix for the WCS board? Is it necessary on my rev 3 WCS? I can't find any information on that issue.

[rkauer]

 What the Ph00k is a WCS board? :-?

[koaftder]

rkauer wrote:
 What the Ph00k is a WCS board? :-?

It's the daughter board on the a1000.

[Terse]

Just search the web for PAL+grounding+amiga and you'll find a bunch of sites describing the grounding.  

What accelerator did it come with?

[koaftder]

Terse wrote:
Just search the web for PAL+grounding+amiga and you'll find a bunch of sites describing the grounding.  

What accelerator did it come with?

Thanks for the tip, I found lots of places describing that fix. It looks like the wires in the picture are that fix, but it's missing the path to ground and some of the wires seem in the wrong place. It's like they just tied the ground together at the chips in two sets and I think the other wires tie the vcc together, I'll have to get a pinout of that chip.

The accelerator is an IDC Adspeed. I haven't noticed the difference in the few apps i've tested it with, but sysinfo defiantly shows improvement when it's switched on.  

[amigaksi]

I happen to have two Amiga 1000s that have the PAL grounding done to them with some resistor modifications.  There's a message on the bottom of the Amiga that states the resistor numbers that were modified.  The guy who sold me the Amigas claims it was from an article in Amiga World magazine so you may want to search through there...  He said it makes the video circuitry better.

[yorgle]

I made a few simple hacks to my A1000 over the years:
- replaced two pals that were giving me trouble
- grounded all of the pals together, then to a pad on the mainboard
- pulled one resistor from the video circuit for better color accuracy
- bypassed the low-pass filter

ref: http://www.amigau.com/aig/a1000faq.html (and links thereof)

- replaced two LS logic chips in the video path with hopes of fixing my color intensity weirdness issue

I want to hack in switchable kickstart roms, but haven't figured all of that out yet. (switch between no rom (floppy), 1.1, 1.3, 1.4 (why not), 2.0, perhaps 3.9 for the heck of it.  I've got the rom burning equipment and stuff...

Now i just need to track down the video issue and find a replacement 'x' key for my keyboard, and i'll be back in business.  

I also often think that I want to figure out how to mount my Data Flyer 1000 inside the case, but that seems unlikely.


The changes to your board look interesting.  looks like the two pairs have had their powers and grounds tied together, but i've never heard of that change... just desolder them all off, and tie the grounds of them properly.