Thank you all for the hints, i've ordered the Ultimate 1Mb and going to desolder the CPU and MMU. I'll keep the RF modulator since it works fine, and all 65XE's motherboard is in good condition, while the case has some damages, so i'll not worry if i'll have to drill it for a connector if i'd decide...

I have the sdrive max, that I use with 65xe and with my 800xl, but I think I'll upgrade only the 65, because the 800 is boxed and I take it out from its polys rarely, to preserve them! I'm very interested in VB/XE too, I use RGBtoHDMI for most of my retrocomputer, and I am waiting for the OSSC+koryu...

If you look earlier in the post, somebody has used a GAL to do a 320KB upgrade. Personally I have upgraded to Ultimate 1MB since I made this post, so haven't followed up any further along those lines. I red about 320k upgrade, but I think a different gal (22v10) and a new jed files it's needed for ...

Hello everybody! i found this great thread about 65XE ram upgrade, but just discovered mine has a 130XE(64x4) motherboard with unpopulated U11, U12 and U35: since aren't more available on ebay the C25953, is there a way to program a GAL for replacing it?