I have this mostly working STFM here with these 30 pin simm sockets floating under the keyboard. I threw two 256K simms in there to see if it would go to 1MB, but no dice.
Has anyone seen a mod like this before, and should it work?
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Ever seen an STFM memory upgrade like this before?
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VonIII
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Ever seen an STFM memory upgrade like this before?
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rubber_jonnie
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Re: Ever seen an STFM memory upgrade like this before?
Yes, they pop up from time to time and it should work.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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stephen_usher
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Re: Ever seen an STFM memory upgrade like this before?
It may need 1MB SIMMs.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
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VonIII
- Posts: 4
- Joined: 13 Dec 2022 11:33
Re: Ever seen an STFM memory upgrade like this before?
Thanks for the feedback all. I'll try some 1MB SIMMs. I've heard the bios will simply "ignore" memory it doesn't like, is there any flavor of memory that these machines prefer or are proven to work with?
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VonIII
- Posts: 4
- Joined: 13 Dec 2022 11:33
Re: Ever seen an STFM memory upgrade like this before?
I found this diagram which is helpful, and tracing each connection i've already found some issues, like A1 & A5 are transposed on the right-hand SIMM. I'll keep checking. If I do get it working i'm going to consider re-doing the whole job a bit cleaner.
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VonIII
- Posts: 4
- Joined: 13 Dec 2022 11:33
Re: Ever seen an STFM memory upgrade like this before?
Fixed the wiring and found a set of SIMMs the STFM likes
Now I can play some games after the HD driver loads =)
Now I can play some games after the HD driver loads =)
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