Z-Berry: Z-80 computer

Re:Z-Berry: Z-80 computer by cr0sh on Thursday June 15, 2017 @02:32PM (#14563078)

My Tandy Color Computer 3 had 512K (standard was 128K) and an 8-bit CPU (6809). It did have something akin to a MMU though (the GIME chip) - which paged the RAM in banks of 8K.

As far as what it was used for - people mainly used it for RAM disks; it could also be used for page-flipping for the higher-res graphics modes the CoCo 3 supported.

For the OS-9 Level II operating system, it was used much more efficiently to allow for larger (or more) programs to be multi-tasked, along with other uses.

(for those unaware - OS-9 was a multi-user, multi-tasking operating system for the 6809 and other 8-bit microprocessors of the day - but mainly geared to Motorola CPUs - including later the 68k family)

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Re:Z-Berry: Z-80 computer by vhodges on Thursday June 15, 2017 @05:39PM (#14564615)

There's an OpenSource replacement called Nitros9 http://www.nitros9.org/documents.html

Also: https://github.com/nealcrook/multicomp6809/wiki

and finally: https://www.retrobrewcomputers.org/doku.php for more retro goodness.

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