Searching for data sheets MC1468705 series ...

[budgie]

I'm hunting for a data sheet for preferably the 1468705G2S variant but others
would be interesting. Google searches reveal nothing, and most listings in the
Moto AN series lead to dead-ends at onsemi, mot-sps or freescale websites.

Any helpful suggestions would be appreciated.

 

[onestone]

This sounds like a very early 6805 microcontroller. You might try
searching MC68705, this returned 299 hits on google. If this is what you
want then there are many variants of the part.

Al

 

[budgie]

This sounds like a very early 6805 microcontroller. You might try
searching MC68705, this returned 299 hits on google. If this is what you
want then there are many variants of the part.

Thanks Al that is the series it belongs to, but I specifically need info such as
the EPROM capacity/programming etc which would be more specific than the generic
6805 for which I do have a data sheet.

 

[Alan]

Thanks Al that is the series it belongs to, but I specifically need info such as
the EPROM capacity/programming etc which would be more specific than the generic
6805 for which I do have a data sheet.

Peter

I have some limited info.

The 1467805G2 has 2106 Bytes of Eprom. 128 bytes of "page 0" eprom
starting at 80 hex then 1968 bytes of "user" eprom.

Also 112 bytes RAM, top 64 bytes of which are the stack.

I have the schematic of a programmer for that device. You put the
progamme first into a 2764 and then plug the 68705 and the 2764 into
the programme and the internal programming algorithm in the 68705
programmes itself. Takes approx 200 seconds to programme.

If you want a copy of the programmer cct (2 IC sockets, 2 leds, 3
switches, a few transistors and resistors/caps and a 1.0MHz xtal) then
use my contact page to send me your mailing address and I will copy
and send in the post for you.

HTH

Regards

Alan
++++++++++++++++++++++++++++++++++++++++++
Jenal Communications
Manufacturers and Suppliers of HF Selcall
P O Box 1108, Morley, WA, 6943
Tel: +61 8 9370 5533 Fax +61 8 9467 6146
Web Site: http://www.jenal.com
e-mail: http://www.jenal.com/?p=1
++++++++++++++++++++++++++++++++++++++++++

 

[budgie]

Peter

I have some limited info.

The 1467805G2 has 2106 Bytes of Eprom. 128 bytes of "page 0" eprom
starting at 80 hex then 1968 bytes of "user" eprom.

Also 112 bytes RAM, top 64 bytes of which are the stack.

I have the schematic of a programmer for that device. You put the
progamme first into a 2764 and then plug the 68705 and the 2764 into
the programme and the internal programming algorithm in the 68705
programmes itself. Takes approx 200 seconds to programme.

Ah, the old 'bootloader" ....

If you want a copy of the programmer cct (2 IC sockets, 2 leds, 3
switches, a few transistors and resistors/caps and a 1.0MHz xtal) then
use my contact page to send me your mailing address and I will copy
and send in the post for you.

Will do, and thanks.

 

[Alan Peake]

I'm hunting for a data sheet for preferably the 1468705G2S variant but others
would be interesting. Google searches reveal nothing, and most listings in the
Moto AN series lead to dead-ends at onsemi, mot-sps or freescale websites.

Any helpful suggestions would be appreciated.

If you can get the old Motorola data books, it's in the MCU one
(Microcomputer Data Book) circa 1983.
I thought I had one but that must have been the one missing from my set.
Alan

 

[bruce varley]

I'm hunting for a data sheet for preferably the 1468705G2S variant but others
would be interesting. Google searches reveal nothing, and most listings in the
Moto AN series lead to dead-ends at onsemi, mot-sps or freescale websites.

Any helpful suggestions would be appreciated.

Hi Peter, I have the MCU data book. Email me if you'd like to borrow.
Regards

[email protected]
remove ecks and kyoo to email.

 

[John Crighton]

Hi Peter, I have the MCU data book. Email me if you'd like to borrow.
Regards

[email protected]
remove ecks and kyoo to email.

Hello Bruce Varley,
I was looking for information on the "Varley Test" on
an old megger that I picked up recently. Since you
have the same name, you might have zeroed in on
this particular test and know all about it.
A long shot, I know, but I had to ask.

All I could find out is that a man called Varley was
an engineer on board the cable laying ship Great
Eastern way back in 18?? and he had devised a
way of locating breaks in the transatlantic telegraph
cable. You might even be related. That would be
something! Carrying on the family electronics tradition.

Regards,
John Crighton
Hornsby

 

[budgie]

Hi Peter, I have the MCU data book. Email me if you'd like to borrow.

Hi Bruce

Alan H kindly forwarded a copy of pp 125-137 from some book. It has answered
lot of questions and raised a few. If that corresponds to the section 6 in your
book then it's the same. I was planning on checking out the "library" at WWE
next week. Things like cold/warm start vectors, interrupt routine vector etc
etc I still need to tie down. Will get back to you if required, tnx.

 

[Alan]

Hi Bruce

Alan H kindly forwarded a copy of pp 125-137 from some book. It has answered
lot of questions and raised a few. If that corresponds to the section 6 in your
book then it's the same. I was planning on checking out the "library" at WWE
next week. Things like cold/warm start vectors, interrupt routine vector etc
etc I still need to tie down. Will get back to you if required, tnx.

Peter

Have a look at the memory map on page 137. The reset vector is
$1FFE - $1FFF. All the interrupt vectors are at the top as well.

Normally use an .org of $80 or $100 depending on what you want.

Let me know if I can give you any more info (although what I have is
limited).

Regards

Alan

++++++++++++++++++++++++++++++++++++++++++
Jenal Communications
Manufacturers and Suppliers of HF Selcall
P O Box 1108, Morley, WA, 6943
Tel: +61 8 9370 5533 Fax +61 8 9467 6146
Web Site: http://www.jenal.com
e-mail: http://www.jenal.com/?p=1
++++++++++++++++++++++++++++++++++++++++++

 

[budgie]

Peter

Have a look at the memory map on page 137. The reset vector is
$1FFE - $1FFF. All the interrupt vectors are at the top as well.

Ahh - should have read the fine print :-(

Normally use an .org of $80 or $100 depending on what you want.

Let me know if I can give you any more info (although what I have is
limited).

Should be cool now tnx

 

[bruce varley]

Hello Bruce Varley,
I was looking for information on the "Varley Test" on
an old megger that I picked up recently. Since you
have the same name, you might have zeroed in on
this particular test and know all about it.
A long shot, I know, but I had to ask.

All I could find out is that a man called Varley was
an engineer on board the cable laying ship Great
Eastern way back in 18?? and he had devised a
way of locating breaks in the transatlantic telegraph
cable. You might even be related. That would be
something! Carrying on the family electronics tradition.

Regards,
John Crighton
Hornsby

Same name, and there are a few engineers in our family, but according to the
work done by one of my rellies in UK, there's no explicit connection with Mr
Varley of loop fame. All I know about his test is that it's a bridge method
that can locate cable faults of some sort. Regards