coleconut Posted September 7, 2022 Share Posted September 7, 2022 I think its some kinda memory card but not really sure or for which model computer. Ideas? Quote Link to comment Share on other sites More sharing options...
+David_P Posted September 7, 2022 Share Posted September 7, 2022 My guess is that it's a solderless internal 256K upgrade for an XL. The socket would go under the PIA. Quote Link to comment Share on other sites More sharing options...
Stefan Both Posted September 7, 2022 Share Posted September 7, 2022 I probably miss something. 16x32k =512k ? Stefan 1 Quote Link to comment Share on other sites More sharing options...
ClausB Posted September 7, 2022 Share Posted September 7, 2022 Yes, 512K bytes, maybe for a 16-bit machine, since 16 wires appear to go to the socket, so probably not for an XL. Quote Link to comment Share on other sites More sharing options...
Stefan Both Posted September 7, 2022 Share Posted September 7, 2022 42 minutes ago, ClausB said: Yes, 512K bytes, maybe for a 16-bit machine, since 16 wires appear to go to the socket, so probably not for an XL. 🙈 I'm totally confused now. You're right, 16bit wide... But isn't it then 256k ? Stefan Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted September 8, 2022 Share Posted September 8, 2022 16 * 256Kbit = 512K probably this is a 1/2 MB upgrade for a 520ST 16 bit wide is 2 bytes hence 512KB 1 1 Quote Link to comment Share on other sites More sharing options...
ClausB Posted September 9, 2022 Share Posted September 9, 2022 13 hours ago, TGB1718 said: probably this is a 1/2 MB upgrade for a 520ST Yes, the socket pinout looks like U31, the Shifter. https://archive.org/details/Atari_520ST_Schematic_1985/page/n1/mode/2up 1 Quote Link to comment Share on other sites More sharing options...
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