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http://www.passionmsx.org/modules/xcgal/displayimage.php?pid=1232&album=97&pos=8 you can see a 1Mo extend in a ST with Chip directly on support no Simm no Board and no problem with the keyboard film in the Simm extend the components destroy the keyboard film look the CMS resistor near the ram with special position for bank 0 of memory

Great, very compact and clean, it looks easily to do.

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for expand to 1Mo added a little board with a LS670 , LS367 , LS00 and LS32 for memory mapper (i can scan the schema) on GT sold J302 , desold R352 and resold it on R353 on the ST is more dificult because cutting wire under pin 18 of the rR800 is not easy second difficult sold a wire on pin 18 R800 and don't strap other pin sold a strap on R229 desold R206 strap R206 near D22 to A14 ( i have the schema) i can send a mail with schema for ST and GT but info are in french

Jipe, can you send me the schema's and desciption how to do this? No poblem if it is in Fance, I can try to translate and add it to my pages. Email is msxhans at yahoo.com Thanks!

Hans

i send to Hans the schema for the additionnal board
the memory is not on this schema
if you use M514400A-70SJ on the ST you have no problem
remove it on old PC memory is easy just pull with a screwdriver
on my GT i have a SIMM 80ns because with 70ns the GT abnormal boot

i find the original additionnal board in a friend's GT buy in Deutchland and is inventor is unknow
i just adapt for the ST because is different board
the original SIMM 1 Mega is on a LZH files made in Japan (i search it for sendind)
this file contains many info for the memory R800 and S1990

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i send to Hans the schema for the additionnal board

I made a pdf of all the circuit diagrams and photos, translated as best as I could and added what was described.

Hans