screenshot
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

(c) 2002-2009 SATANTRONIC
Last update: 19.7.2009 Version 1.22