A couple of do-it-yourself hardware addons for the old short model Atari ST(M)
Free but comes with no warranty.


STBlitter_RevA:
https://github.com/agranlund/STBlitter_RevA

Blitter + IDE + TOS 2.06 decoder
STBlitter_RevA


STBlitter_RevC
https://github.com/agranlund/STBlitter_RevC

Blitter + IDE + TOS 1/2/3 decoder + STGA interface for ET4000 graphics card

STBlitter_RevC

STRam:
https://github.com/agranlund/STBlitter_RevA
4MB RAM upgrade
STRam_RevA

STRom:
https://github.com/agranlund/STRom
Eprom + realtime clock board
STRom_RevA