News for hackers. Stuff that matters.

A comment on Z-Berry: Z-80 computer. Parent comment

Re:Z-Berry: Z-80 computer by makomk on Thursday June 15, 2017 @05:34PM (#14564572)
Of course, in order to copy the bank switching code to the other banks you need to switch to them first. Which means that this copying can only be done by the ROM.
[ Parent | on HN ]
Re:Z-Berry: Z-80 computer by jacquesm on Thursday June 15, 2017 @08:06PM (#14565532)
No, you'd do that with a little bit of PIC running in one of the other parts of RAM.
[ Parent | on HN ]
Re:Z-Berry: Z-80 computer by makomk on Friday June 16, 2017 @02:09PM (#14571312)
Only one bank can be active at a time, so the only RAM you can run the code from is the same bank that you're trying to load code into. Slight chicken-and-egg problem.
[ Parent | on HN ]
Re:Z-Berry: Z-80 computer by jacquesm on Sunday June 18, 2017 @07:39PM (#14583629)
No, that's not how these systems work. The bank switched RAM is switched in banks of 16K, so you can keep 48K 'constant' while the other 16K is switched as a window in the 256K.
[ Parent | on HN ]