2mb chip ram on A500+

[desantii]

Just finished adding an extra 1mb chip ram to my A500+ (rev 8.1), used 8 more 256k x 4 DRAMs on top of the existing ones.
It was fairly simple (doesn’t look pretty but it works). Bend pin 17 on all 8 new chips. The leftmost 4 are then all connected via pin 17 and then connected to pin 36 on the memory expansion connector. The other 4 again all connected via pin 17 but to pin 35 on the memory expansion connector.

This gives an extra 1mb chip ram for a total of 2mb
I will post pictures tomorrow, but for now extremely happy with 2mb chip ram, now I need some type of accelerator J

[desantii]

I had some salvage chips I used(sorry no more chips). I did it as I had the chips and the 1mb expansions are not that easy to get a hold off.

[desantii]

Bad news, after a couple of hours the sceen went corrupt, then after reboot it would only see 1mb.. of course after they were soldered in places... now for some debuging

[desantii]

Hi, actually yes. One chip had a cable that was not properly soldered, its working again.

[desantii]

Actually the Supra is next on the list for my 500+

Good hacking! The A500+ is a nice old lady. Certainly deserves a full 2Mb chip ram expansion and some fastmem.

I remember I had to search a good while before finding a trapdoor expansion.

As for accelerator, even a cheap Supra Turbo (68000/28Mhz) will give it a good kick.