+Peter Rabitt Posted November 29, 2021 Author Share Posted November 29, 2021 OK, I went to the google way and found the answer on "best-electronics"... The answer is: CO26160 ST U.S. TOS 1.0 256K (H2) ROM CO26161 ST U.S. TOS 1.0 256K (H1) ROM CO26162 ST U.S. TOS 1.0 256K (H0) ROM CO26163 ST U.S. TOS 1.0 256K (L2) ROM CO26164 ST U.S. TOS 1.0 256K (L1) ROM CO26165 ST U.S. TOS 1.0 256K (L0) ROM I am assuming this is correct... Does anyone want or need tos 1.0 roms??? I have read the best TOS for ST520 is TOS 1.04/1.4... Now to try and make/get the second computer to run.. It comes up but does not display the desk top...Just sometimes different stuff with screen, colors, black screen etc... Also the power switch is bad and I would like to get the new one before jumping the switch...ON the way.. Peter Quote Link to comment Share on other sites More sharing options...
+Peter Rabitt Posted November 30, 2021 Author Share Posted November 30, 2021 O' boy more problems to solve.. After working on the 520 #2 ,got it to work and yes the TOS is 1985 So yes it must be TOS 1.0.. Re seated the chips(in sockets) on the mo and jumpered the power switch and it came up. Them I noted that the "F1" key was always down, not like the other ones... What is the F1 key used for and does it mater if it does not work, If so then who knows where to get a new one?? If it does nothing then I will let it go... The next problem is the mouse does not go down..OK other directions UP,Side to side but not down. Also always on the straight no diagonal movement... I read some where that someone took the mouse apart and clean everything and put it back and it WORKED. So now I take it apart..Let you know what happens... Do the problems ever stop so you can enjoy the ST's and even the A8's I have...????? Peter Quote Link to comment Share on other sites More sharing options...
bfollowell Posted November 30, 2021 Share Posted November 30, 2021 On 11/28/2021 at 5:57 PM, Peter Rabitt said: @bfollowell, Yes the switch you showed was a good switch for a power supply but not for the ST.. Ordered one from Digi-key...Little ex$$$ but ok with it.. Ah, yes, of course, 520, external PSU. I wasn't thinking. Quote Link to comment Share on other sites More sharing options...
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