Double your RAM:

[at67]

Nice pics, discreet job like cde's, welcome to the club.

[giobbi]

hi all,

I finally made the 64k upgrade. I decided for a different solution, I put a socket that can be used for both 32k and 64k chips.

Since I hadn't a 32 pin socket (and frankly I'm too lazy to remove a 28 pin socket if I can avoid it ) I decided for a Frankenstein socket: I cut a portion of the socket (pins 1,2,3 and 26,27,28) and I removed it. Then I built the replacement in a MacGyver way:

IMG_20210819_090710.jpg (309.48 KiB) Viewed 2292 times

I lowered the 4 (2+2) extra pins with the Dremel, so they don't touch the board (I checked it out later passing a piece of paper between the pins and the board: the papel have to pass freely behind the pins to be sure they're far enough from the board to prevent any unwanted contact).

IMG_20210819_090700.jpg (99.23 KiB) Viewed 2292 times

The red wire (A15 line) comes from an old, burnt pinball coil; it's very well insulated (it's hard to remove the red coating) and thin enough to pass between two socket pins

IMG_20210827_120524.jpg (384.54 KiB) Viewed 2292 times

And here we have the 64k RAM chip installed:

IMG_20210827_120623.jpg (185.63 KiB) Viewed 2292 times

And of course the Gigatron liked it

IMG_20210827_120739.jpg (708 KiB) Viewed 2292 times

[Sugarplum]

That's a neat way to do that.

[veekoo]

Time to do 64K RAM upgrade mod. I did it from the top of chip.

Now that I have 64K RAM, what are the top applications benefitting from more memory?

btw. I've tested most of the programs marked _64k_

[psergiu]

Upgrade worked fine with a generic 128k x 8 TTL SRAM: MT62C1024P-70L
Could not find a 32-pin socket in parts bin so I soldered AWG30 wires under the RAM chips