11 Jun
2019
11 Jun
'19
2:17 a.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Chuck Guzis via
cctalk
Sent: Tuesday, June 11, 2019 12:19 AM
To: Tony Duell via cctalk
Subject: Re: HP9816 PAL16L8
On 6/10/19 8:44 PM, Tony Duell via cctalk wrote:
http://www.vcfed.org/forum/entry.php?330-Cloning-a-PAL-HAL-Part-13
http://www.vcfed.org/forum/entry.php?329-Cloning-a-HAL-PAL-Part-12-The-Tran…
http://www.vcfed.org/forum/entry.php?328-Cloning-a-HAL-PAL-Part-11
http://www.vcfed.org/forum/entry.php?327-Cloning-a-HAL-PAL-Part-10
http://www.vcfed.org/forum/entry.php?326-Cloning-a-HAL-PAL-Part-9
http://www.vcfed.org/forum/entry.php?325-Cloning-a-PAL-HAL-Part-8
http://www.vcfed.org/forum/entry.php?321-Cloning-a-PAL-HAL-(Part-7)
http://www.vcfed.org/forum/entry.php?320-Cloning-a-PAL-HAL-(Part-6)
http://www.vcfed.org/forum/entry.php?319-Cloning-a-PAL-HAL-(Part-5)
http://www.vcfed.org/forum/entry.php?318-Cloning-a-PAL-HAL-(Part-4)
http://www.vcfed.org/forum/entry.php?316-Cloning-a-PAL-HAL-(Part-3)
http://www.vcfed.org/forum/entry.php?315-Cloning-a-PAL-HAL-(Part-2)
http://www.vcfed.org/forum/entry.php?314-Cloning-a-PAL-HAL-(Part-1)
A nice read. When does the article/book get self-published :->?
-----
paul
You can detect sequential logic in the PAL by :
For each combination of inputs :
Read the outputs
Toggle an input (change from 0 to 1 and back again or vice versa)
Compare the outputs to what they were before -- if they have
changed then there's a sequential function on that input
Check the next input
Check the next combination of inputs
For purely combinatorial PLDs, see my blog entry on the subject over at
vcfed.org; I did the work to clone a few PALs some years ago and
documented the process.