We were able to power on about 3/4 of the systems we tried, although we didn't have much luck with the ECD 7x system. It booted to a point, but the Pertec floppy disk subsystem wouldn't seek to the right part of the disk.
No matter, the cassette systems loaded just fine, and people had a grand time playing spacewar.
[Notes from another ECD hacker]
> ECD Micromind ... based on the 6502 processor, but
> had minicomputer features including:
> a 64M address space [the stock 6502 could only address 64k],
>
Only 64k virtual at a time. There was an MMU to remap it onto a
larger physical memory, but few, if any Microminds ever had more than
64k including video memory.
> a supervisor mode, and (possibly)
Don't think so.
> additional opcodes (which the CPU board kept away from the 6502
> processor).
It had an illegal opcode ROM table that triggered a non-maskable
interrupt upon fetch of an illegal opcode. The 6502 was notorious for
doing unreasonably strange things when fed nonsense code...
Complexity: The Emerging Science at the Edge of Order and Chaostechnorati tags:
micromind
