On Tue, 8 May 2001, Marko Mäkelä wrote: > The "some extras" must involve hardware ^^^^^^^^ Sorry, I meant "cooperation of hardware and firmware", something what a freezer cartridge such as the Action Replay does. The "suspend" mode would trigger an NMI and force a ROM bank switch, and the NMI handler would save the state of all chips and registers into normally inaccessible (battery-backupped) RAM. The reset routine would check from this special RAM if the computer was suspended. If it was, it would restore the state of all I/O chips. Of course this doesn't work for all chips or for all registers. You can't read the SID chip registers. Some VIC-IIe and CIA registers can only be read indirectly (by using delay loops). Does anyone know how well the Action Replay and other freezer cartridges capture the state of the I/O chips? Marko - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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