topic Re: MC1468705G2 information in 8-bit Microcontrollers

MC1468705G2 information

Nihilist — Sat, 06 Dec 2008 07:18:42 GMT

Hello,

anyone got information about how to program / read / verify this old device ?
New programmers don't support it, and the old hardware which existed 20 years
ago is long lost.

Any help or ideas ?

Mike

Re: MC1468705G2 information

peg — Mon, 08 Dec 2008 06:17:46 GMT

Hi Mike,

Try removing the 7 from your part number in a Google search.
This is not what you want but provides many hits that may lead you somewhere.

Re: MC1468705G2 information

Nihilist — Sat, 20 Dec 2008 04:28:02 GMT

Hello,

thanks for your reply. The "7" means that it is an EPROM version of the controller,
so its needed :smileyhappy: I have found lots of information, but no real information about how
to program or read this controller. Somewhere was an old application note AN852
mentioned, but I didn't find it. Also, the AN1009 and AN1011 would be helpful, but
I can't find them on the net.

Its hard to find information for old devices...

Mike

Re: MC1468705G2 information

celsoken — Sun, 21 Dec 2008 08:40:38 GMT

I feel like a dinossaurus from stone age, but I remember these parts.
I think they were one of the first of the 6805 CMOS generation.

Normally these parts programmed themselves, they had a boot rom wich was activated by high voltage (9V) in a pin, some used a CD4040 to generate address, all controlled by the 6805.
Of course, you had to provide high voltage externally.

Unfortunately I put the old moto stuff in garbage can recently.
But if I could find one of these old stuff, I'll send it to you.

Cheers,

Celso

Re: MC1468705G2 information

Nihilist — Wed, 07 Jan 2009 06:36:38 GMT

Hello Celso,

I understand what you mean. Its really old stuff I am looking for. I
already know that those devices could be monitored somehow.

The "normal" G" ( 705G2S ) can be read easily and also programmed.
Reading is done by verification of the contents ( detect A0 and CE, force
reset, present data, as an endless loop, and takes long. I have programmed
such a G2S with an external EPROM and I could get out the contents
within one week - dont laugh, it really took so long.). The EPROM file
was identical to the verified dump.

The problem is, that the G2L1 type cant go into verifying mode by grounding
VPP and switching -12V to IRQ, like the G2S.

The G2L1 is similiar to some SC and ZC commercial types, which also
cant be read out. They also dont want to go into verify mode. The software
works correct....

Michael

Re: MC1468705G2 information

pierreriley — Mon, 12 Mar 2018 00:34:06 GMT

Hi All,

Was there any success to this?

I would also like to know how to read this chip, like what hardware do I need. All help is much appreciated

Kind Regards

Pierre Riley.

Re: MC1468705G2 information

celsoken — Wed, 04 Jul 2018 03:22:33 GMT

Dear Pierre,

Pls google mc1468705g2, There is a PDF on Benoit page which is an old Moto AN. It programs itself.

Cheers,

Celso

Re: MC1468705G2 information

celsoken — Wed, 04 Jul 2018 12:07:29 GMT

And for reading you could check Reading the Eprom data from a vintage UV Eprom CPU Thanks to Matthieu Benoit for that!

Cheers,

Celso