3 Mar
2011
3 Mar
'11
1:56 p.m.
In article <4dece01a1688a435ac02afa322112d3f at cs.ubc.ca>,
Brent Hilpert <hilpert at cs.ubc.ca> writes:
Fortune shines in a small way.
The MC146805E2 is a CMOS 6805 with no internal ROM. 8 pins are
multiplexed data and low order-address (A0-A7), another 5 pins are
higher-order-address (A8-A12). There are an address strobe pin and data
strobe pin for demuxing.
Other major features:
- 112 bytes internal RAM
- 16 programmable bidir IO port lines.
- internal 8-bit timer and 7-bit prescaler.
- on chip oscillator
I see there is only one accumulator in the 6805s, so - as Eric was
hinting at - the base CPU is paired down from the 6800. Haven't checked
whether it is op-code compatible.
Yay, so its not a crap chip after all and could be reused in a
hobbyist project.
If anyone wants one, let me know and I'll collate together requests
and pass it on.
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