2 ms·
There was a 556 on the Apple ][ disk controller (a dual 555). See: https://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Interface%20Cards/Disk%20
by fortran77 6mo ago
There was a 556 on the Apple ][ disk controller (a dual 555).
See: https://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Interface%20Cards/Disk%20Drive%20Controllers/Apple%20Disk%20II%20Interface%20Card/Schematics/Apple%20Disk%20II%20-%20Schematics%20050-0005-01.pdf https://mirrors.apple2.org.za/Apple%20II%20Documentation%20P...