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.......
OOOOH whats this....... a 2.5mb upgrade
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 .
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
Mod #2 The STFM
Re: Mod #2 The STFM
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
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Mod #2 The STFM
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)
The eproms are 256kbit - M27C256B-10F1 so 32 kbyte
cheap as chips off EbAY (Less than 5 quid 10)
Re: Mod #2 The STFM
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.
Atari VCS2600jr - Uno Cart 2600, Atari Lynx, Atari 800XL, 1010 Cassette Unit, SIOPCUSB, Atari 130XE 512KB - Stereo POKEY - XC12, Atari 520STFM - TOS 1.04 - Blitter - 2MB RAM Expansion - Gotek USB Floppy ( HxC Firmware), Commodore C128 - JiffyDOS 6.1 - SD2IEC - Oceanic 118N - JiffyDOS 5.0, 1530 Cassette Unit, TAPuino, Amstrad CPC6128 - M4 - 512KB RAM - Gotek USB Floppy