2 Mar
2011
2 Mar
'11
5:34 p.m.
On 2011 Mar 2, at 3:44 PM, Richard wrote:
A neighbouring hacker space has access to some
Motorola 6805 equipment
pulls. These are 6800s with some amount of on-chip RAM, ROM and IO.
I have no idea what the ROM might contain or if you can circumvent the
ROM with your own code in off-chip RAM.
They don't have any plans for these chips. If you are familiar with
them, we'd like to learn more about them. If you need some for your
project, just let me know.
I have here the 1984 Motorola "Single-Chip Microcomputer Data" book,
which covers the 6805 family. There are a dozen or two variations of
the 6805. If you provide the full part number I can look it up.
From an initial look at the the book however, it appears most of the
variations are mask-programmed and I'm not seeing any opportunity to
address or substitute external ROM. There are some EPROM (68705,
windowed of course) and a couple of EEPROM (6805K2,3) variations.