exxos's Atari, Amiga & retro forum

So i have a few ST's in the loft and i thought i would mod my STFM with a few bits.....

I cracked the bad boy open and found a 2 chip TOS 1.02 and an unknown memory upgrade....... :D
OOOOH whats this....... a 2.5mb upgrade :D
So 1st order of business was to junk the tos and goto a better version..... 1.4 rainbow of course......

Having a bunch of brand spanking 27c256 chips 100ns i thought .... why not !! i grabbed a romsplitter (PP) and split the 1.4 rom in Hatari and burned it too 6 chips....
I then changed the 3 solder pads over to the correct setting (256)
And there be a new TOS installed :)
I also added the rather ubiquitous BLITTER .......

Exxos adapter ......
And to test.......
Next up was to program a GOTEK......
And print and fit it into a case.......
And then to get hack happy on the casing of the STFM
Best to mark it out first.......

Then to dremel......
Now , BE CAREFUL if using a FILE...... i managed to snap off a strip of casing whilst filing.....

But i made an invisible repair with 2 part epoxy later :D.

The "furry" abs after dremelling (is that a word????) can be removed easily with your fingers brushing it off.

Then to 2 part epoxy the printed plate into the case.....
And solder a couple of port relocation cables .......
Bung in the OLED and fire it up.......
I also recapped the PSU whilst i was at it...........

Lee

:bravo:

So normal 256K ROMs work without any other mods ? I never tried it, always went for the 1MB ones and they do need mods as they larger. IIRC last time I looked the pinout of the 256K ROM's was different than the ST ones ?

RAM upgrade looks pretty sweet as well :)

Sorry went a bit quick uploading all that...... The was a mobo pic of my oher ST in there (rev D)

The eproms are 256kbit - M27C256B-10F1 so 32 kbyte :)

cheap as chips off EbAY (Less than 5 quid 10)

Could you tell me more about the 3D printed holder for the Gotek? I don’t have access to a 3D printer so something like the holder and faceplate would be ideal for me.