On 22/02/2018 12:07, And Fachat wrote: > > Also if you change the port, the processor would read the next > instruction from a different bank. How would you make sure there is > valid code if instructions and load/store always go to the same bank > as determined by the port? > Have an independent boot rom and use one of the other 0/1 io pins to control whether that is on or off. Then you just need something to check if a15/a14/a13/a12 & the i/o pin is set (whichever way it comes out of reset) and the cpu is reading then enable the bootrom and shutoff the motherboard. You can leave the boot rom enable for doing most tests, but obviously when it comes to testing the addresses under the rom then you would then copy the code to ram and switch off the bootrom. Message was sent through the cbm-hackers mailing listReceived on 2018-02-22 14:00:06
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