4 Mar
2011
4 Mar
'11
10:37 a.m.
On Thursday (03/03/2011 at 10:55PM -0500), Curt @ Atari Museum wrote:
It has an SPI (Serial Program Interface) so it should
conform to a
standard MOSI/MISO/RESET/SCK interface.... so I you can tap the pinouts
of it, apply gnd and power to it and hook it up to an ISP programmer,
you should be able to read in the code from it and save it as a bin or
hex file.
well, no. Not exactly. The SPI on these devices is not used to program or
in any way access the EPROM on the devices without the 6805 participating
in such transfers.
They do have a ROM that facilitates programming and dumping of the EPROM
and it does this through the serial (SCI) port. However they also have
a security bit which if set, prevents verifying and dumping the EPROM.
So, you _could_ dump the EPROM, via the serial port, using the on-chip
ROM code but only if that security bit has not been programmed.
Here's the datasheet:
http://www.ic-on-line.cn/IOL/viewpdf/MC705C8ACFNR2_393498.htm
section 9.4.8 on page 115 discusses dumping the EPROM...
Geoffrey Reed wrote:
> I need to pull the rom image off of a MC705C8acpe, anyone know how? Or if it
> is possible?
--
Chris Elmquist