ALL SOLD 4MB Atari 520ST upgrade board

[Dopy25]

Update: I have 2 left.

Update: last 2 are pending. 

 

ALL SOLD

 

I only needed one, but since 5 boards was the minimum order, I bought enough to make 5. I figured instead of throwing away 4 blank boards, I would buy enough RAM and SMD components to finish all of them and part with the rest. I won't do it again so the 4 remaining are up for grabs and that's it. All have been tested in YAART. If you have a preference on how many passes you want me to run, I will redo it. Just let me know.

 

This board will provide your Atari 520ST (an possibly others with a similar 512k layout) with 4MB of ram, or 1MB if you ground the a9 line. You can also use a switch to change between 1MB and 4MB. That would be on you to figure out. 

 

This board was designed by agranlund and the PCB was posted on his GitHub. You can build your own if you have the patience and knowledge. This particular board design was "fixed". By a user (snarkdluG on AA) and posted in a thread here on AA. It does not require a bodge on the ram board, and the CAS & RAS solder points are correctly labeled. They are swapped on the original design. 

 

You must remove your old RAM and put this board in their place. You cannot use sockets as it will not provide enough clearance for the RF or keyboard to sit inside the case. Feel free to Frankenstein it if you want but I warned. 

 

Not all pins are required to be soldered in place. It is labeled as such on the board. Therefore only 2 boards have 2 rows of pins across the top, and 2 have pins only where a connection is needed. You may also need to remove the header pins for the lines that go to MMU. They were there for testing.

 

Feel free to specify which you would like (until I only have one style left)

 

Cost is $35 plus shipping on PayPal.

If you can send Venmo friends & family payment, cost is $30 plus shipping. 

 

Please feel free to ask any questions. 

Edited September 3, 2022 by Dopy25

[Dopy25]

2 sold, 2 left.

[ColecoGamer]

Can you add me to a list for when more of those RAM boards become available?