We proudly presents blueprint of our 1MB SIMM RAM expansion.
Blueprint for basic version download here [44kB].
Blueprint for version with switchs download here [47kB].

Here is blueprint for building 1MB SIMM RAM espansion with our GAL chip. Price of this our GAL chip is 15 Euro with p&p.
Blueprint for basic version download here [26kB].
Blueprint for version with switchs download here [29kB].

Here is some photos of realization our expansion. 1 [53kB], 2 [52kB], 3 [77kB] and photo of XE GS with 1MB is here [495kB].

Here is some photos of how to build into computer.
Picture with pins of SMMMU is here [30kB].
SIMM, picture is here [24kB].
Cut PB1-BE and PB7-MAP, picture is here [240kB].
Picture of PIA, resistor for PB6. Picture is here [199kB].
Picture of MMU, RAM and MMMU is here [404kB].
Scan of Atari 800XE with 1MB RAM (SMMMU), picture is here [3.5MB].
Scan of Atari 800XE with 1MB RAM (SMMMU) with lenghts of wires, picture is here [3.8MB].
Zdenek Krelovec wrote small article (here is Czech version) of how to build 1MB RAM into Atari.

NEW Here is our BASIC manual how to build 1MB RAM into Atari XE Game System (last change 19.7.2009).

Updated (23.10.2007):
There are some diferencies if you want build this RAM expansion into Atari computer with originaly 4-bit memory chips (latest Atari XE models).

Picture of RAM chips pinout is here [18kB].
Picture with signal CAS2BNK is here [92kB].
Scan of Atari 800XE with 1MB RAM (SMMMU), picture is here [419kB].
Other stuff is same as before.

XRAM - (eXtended RAM test)
If you want testing your memory extension, you can use XRAM. With this utility you can test all memory extensions from 0 to 4096kb.

Users list 2002:

-XI-/Satantronic	1x 1MB - without GAL chip 1x 1MB 1x 1MB (XL version of GAL)	800 XE 800 XL XE Game System	Slovakia
Dodo/Satantronic	1x 1MB 1x 1MB	800 XE 130 XE	Slovakia
Thomsen/Foundation Two	1x 1MB	130 XE	Germany
Expert	1x 1MB	800 XE	Slovakia
Elan/Satantronic	1x 1MB	800 XE	Slovakia

Users list 2003:

Zdenek Krelovec

1x 1MB

800 XE

Czech

Honza Krupka

1x 1MB

800 XE

Czech

Lukas Musil

1x 1MB

800 XE

Czech

Merlin (Craig Hart)

1x 1MB - without GAL chip

800 XL

Australia

Users list 2004:

Roman Grzelcak

2x 1MB

800 XE

Poland

Users list 2005:

Mojmir Murin	1x 1MB	800 XE	Slovakia
Alex Ludek Tomasek	1x 1MB	800 XE	Czech

Users list 2007:

Jan Bohacek	1x 1MB	800 XE	Czech
-XI-/Satantronic	1x 1MB	800 XE (4-bit RAM chips)	Slovakia

Users list 2009:

Ctirad Fertr	1x 1MB 1x 1MB	800 XL (without Freddie) 130 XE	Czech
Conrad Russo	1x 1MB	XE Game System	Canada