SuperFuryAnimal Posted April 23, 2022 Share Posted April 23, 2022 Hello, Ive recently got myself an Atari 520STFM and am in the process of a couple quality of life updates. One I would like is the 2 chip tos 1.04 roms 28 pin. Seem hard to find, does anyone have any or can point me to a uk link for buying some??? Thanks Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted April 23, 2022 Share Posted April 23, 2022 I think the best option for you is the 6 chip set, the original PROM used by Atari I believe is no longer available, to use 2x1Mbit chips you would need an adaptor board as they are 32 pin chips, the 32K chips are easy to find, I recently did this TOS upgrade to my old 520 STM. You can get them ready burnt here if you can't do it yourself https://www.exxoshost.co.uk/atari/store2/ Quote Link to comment Share on other sites More sharing options...
SuperFuryAnimal Posted April 23, 2022 Author Share Posted April 23, 2022 My motherboard only has sockets for 2 chips so I’m seeking the 2 chip version, have seen a US version on eBay but hoping for uk Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted April 23, 2022 Share Posted April 23, 2022 It is easy to add 4 sockets, and they are cheap. Can get them in any electronic shop. And someone with little soldering skill can solder them in 10 minutes. Finding now original 28 pin 2 chip TOS is hard, and may cost a lot. I can program and send you 6x chips with UK 1.04 and sockets too if it is problem. PM me if interested. Little more about TOS 1.xx in STs replacement here: http://atari.8bitchip.info/tosimav.html At 60% of page, paragraph: Note about 2 or 6 chip TOS for ST, Mega ST: Quote Link to comment Share on other sites More sharing options...
SuperFuryAnimal Posted April 23, 2022 Author Share Posted April 23, 2022 Sorry but I’m looking for the 2 chip 28 pin tos only Quote Link to comment Share on other sites More sharing options...
Tillek Posted April 23, 2022 Share Posted April 23, 2022 So if those are the same 2 chip setup as the 28 pin 2-chip set as the Megas.... https://www.tindie.com/products/ArcadeStuff/1mbit-mask-rom-adapter/ I bought myself a bunch of those and then the 29F010 PLCC roms for it, and used that to successfully burn both Tos 1.04 and EmuTos for one of my 2-chip megas. Running a BBS off it now, so it's running 24/7 and I can't say I've had any real issues with it yet that I could tell. (It's running rainbow now). Quote Link to comment Share on other sites More sharing options...
snarkdluG Posted April 23, 2022 Share Posted April 23, 2022 9 minutes ago, Tillek said: So if those are the same 2 chip setup as the 28 pin 2-chip set as the Megas.... https://www.tindie.com/products/ArcadeStuff/1mbit-mask-rom-adapter/ I bought myself a bunch of those and then the 29F010 PLCC roms for it, and used that to successfully burn both Tos 1.04 and EmuTos for one of my 2-chip megas. Running a BBS off it now, so it's running 24/7 and I can't say I've had any real issues with it yet that I could tell. (It's running rainbow now). It will work but you probably don't have room for in a STfm. Quote Link to comment Share on other sites More sharing options...
Tillek Posted April 23, 2022 Share Posted April 23, 2022 Also, MyAtari should have them on EBay... that's where I got a set for my other 2 chip Mega. Granted, that's not exactly a UK option.... Quote Link to comment Share on other sites More sharing options...
SuperFuryAnimal Posted April 25, 2022 Author Share Posted April 25, 2022 Have found some 2 chip roms now so my search is over Quote Link to comment Share on other sites More sharing options...
Tillek Posted April 25, 2022 Share Posted April 25, 2022 They were with you all the while? 1 Quote Link to comment Share on other sites More sharing options...
SuperFuryAnimal Posted April 26, 2022 Author Share Posted April 26, 2022 No, some appeared on eBay so I bought them Quote Link to comment Share on other sites More sharing options...
Tillek Posted April 26, 2022 Share Posted April 26, 2022 Sorry... was a song reference. 1 Quote Link to comment Share on other sites More sharing options...
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