>-----Original Message----- >From: cctalk [mailto:cctalk-boun...@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: > >> 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.
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-Trantor-T130B-memory-PAL 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