I concur with Josh’s campfire story.
There aren’t many of the tri-voltage 2716’s out there, but you have to watch.
Because of the tri-voltage needs of 2708’s and TMS2716’s, I have avoided them entirely.
Even when I needed less than 1K of code and it could fit into a 2708, I still programmed it into an Intel 2716.
Bob Bell
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Crusty OMO
Sent: Tuesday, April 14, 2015 6:55 PM
To: n8vem...@googlegroups.com
Subject: RE: [N8VEM-S100:6746] Re: CCS 2810 CPU Rom
Ahh, yes, here's the story about the 2716.... gather around the fire...
The chip prior to the 2716 was the Intel 2708. The 2708 used a configuration of transistors that required 5V, 12V and -5V (like the 8080). Texas Instruments and Motorola both 2nd sourced Intel and at the same time Intel prototyped the 2716, TI and Mot started building the "TMS2716" which are also tri-voltage devices. But, Intel improved the transistor configuration and produced their i2716, which only used 5V. All the other chip makers were "1 step" behind, so they benefited from Intel's new technology and also built 5V only 2716's. Bottom line, be very careful when plugging a 2716 into a socket, make sure that socket isn't wired/powered for the TMS2716, or else you'll be damaging your chip.
If you plug a TMS2716 into a 5V only socket, it just won't work, data will be all FF's I think.
After searching various data books and IC Master, I found that only TI and Mot chips are tri-voltage and are labeled TMS2716. I did a write up on this, it's posted on Herb Johnson's website somewhere...
Cheers,
Josh
Date: Tue, 14 Apr 2015 13:30:30 -0700
From: jeffrey.h...@gmail.com
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:6741] Re: CCS 2810 CPU Rom
In my drawers I found
TMS2716C - apparently not supported by GQ-4X
AM2716DC - Looks to be supported by GQ-4X as 'AM2716'
AM2732A-2DC - I found a setting for 'AM2732A' I wonder what the 2DC, missing from GQ device id, means?
What I'm reading is that the 2732 is pin compatible with the 2716. Comments?
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