Quote:
Originally Posted by Mathesar
My boards arrived yesterday! I also got a good deal on our local ebay (marktplaats) for some SIMM sticks so I am ready for some soldering.
However I am a bit puzzled about all the different jumper settings and configurations:
- First of all, I got a rev B board + Gary adapter. It has room for 4 RAM chips. However, the schematics (Eagle files) on your website are for rev A I guess as the schematics show only 3 RAM chips.
- Second, ideally I want to expand my rev 5 A500 to 1MB chip (by modding the mainboard and replacing Agnus) and 1,5MB slow. This is possible right? How do I need to set all the jumpers then? The rev B schematics would be helpful in that respect so I can maybe figure it out on my own.
The PCB looks very nice BTW and I am looking forward to building this nice little expansion
Nice work  |
OK I just placed the B2 revision on the first page, 2nd post.
Yeah you can do 1MB Chip + 1.5 Slow if you have a 8372 Agnus.
You can just copy my jumpers from the photos on page 3:
http://eab.abime.net/showpost.php?p=...1&postcount=53 . All the RAS need to go to RAS1. Jumpers on the GARY adapter to bottom.
But I would start with a basic 512K expansion first and make sure it works.