The Byte Attic Posted July 29, 2020 Share Posted July 29, 2020 Is there interest in the community for a little board, built entirely with general-purpose, currently-manufactured parts, which replaces the 'Sally' custom CPU in the 8-bit systems? Here is a video of the reverse-engineering and design process: https://youtu.be/iTJLFSFqFeE Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted July 30, 2020 Share Posted July 30, 2020 Well, new/old-stock SALLY chips can be purchased from Best Electronics for $8 each, so there’s likely not a huge demand for any kind of replacement right now. 1 Quote Link to comment Share on other sites More sharing options...
+slx Posted September 3, 2020 Share Posted September 3, 2020 On 7/29/2020 at 7:36 PM, The Byte Attic said: Is there interest in the community for a little board, built entirely with general-purpose, currently-manufactured parts, which replaces the 'Sally' custom CPU in the 8-bit systems? Here is a video of the reverse-engineering and design process: https://youtu.be/iTJLFSFqFeE Maybe there'd be more interest for a 65C816 replacement for Sally (there is one for the "normal" 6502 that fits in the Apple II). In a perfect world it would have RAM as well and all RAM access beyond Bank 0 would go to onboard RAM. Quote Link to comment Share on other sites More sharing options...
Bruce Tomlin Posted September 4, 2020 Share Posted September 4, 2020 The main feature of Sally is just having the HALT line that isn't in a normal 6502, right? I guess it depends on if you can make RDY work like HALT. Doesn't HALT work by stopping the CPU, but RDY just pauses a bus access for slow memory? So I'm going to guess that RDY doesn't free up the address bus. But it seems that on the 65816 there's the BE pin which will disable the address buss. So I guess it would be do-able as a plug-in replacement with a 65816. It's just not worth the effort with a plain 6502 because Best Electronics still has plenty. And I can see how 8-bit users might want one. And in fact, I found this thread: Here is someone trying the reverse, a 6502C in place of a 6502: http://forum.6502.org/viewtopic.php?f=4&t=4190 And here is some information about Sally: http://ushomeautomation.com/Projects/Atari/65816.html Quote Link to comment Share on other sites More sharing options...
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