Denial

Hi levoman

I certainly would be up for building one.

I think PCBWay has a system whereby 10% gets payed to the author of a PCB project.

Hi levoman,


I like the name....

I am a bit of a C64 cartridge fan.

Hi levoman,


I look forward to seeing it on the PCB Way shared.projects site..


What are you planning to call it?

Hi levoman,

Great. I look forward to seeing how you go.


Good luck!

Hi levoman, I would just like to add a comment to eslapion's excellent explanation of his glitch testing circuit. Which I might like to say is very easy to build and very reliable. When purchasing your 74LS279 flip flop IC, I suggest you get several different quality brands from known suppliers . Su...

Update..... Here are some links to videos I made recently testing various PLA's including a NEWLY DISCOVERED Knockoff (fake) ST M27C512-90B1 manufactured in CHINA OTP PROM on a C64 Board Assy No. 250425 board revision that appears to pass eslapion's test circuit. These are knockoff (fake) Made in CH...

Hi eslapion,


Very good advice....


Thank you.....

Hi eslapion, The probe I have is a very cheap one. I do not think it even has a brand name. Here is a link to one like it https://www.aliexpress.com/item/OOTDTY-Logic-Probe-High-Frequency-Response-DTL-TTL-CMOS-Pulse-Memory-Logic-Tester-LP-1/32895150974.html?spm=2114.search0104.3.8.67472505eamJBH&...

Hi eslapion, Thank you for all the patience you have given me. :D I honestly would not have thought to use the Logic probe. It is only all the conversations we have had made me twig maybe a logic probe would be a way of getting around the issue of using suspect M74HC279 CMOS chips. Having the TTL th...

Hi eslapion and bdk6, I had an interesting observation. I hooked up my logic probe to a !ROML take off along side the Texas Instruments 74LS279 Quad S-R Latch I have installed in eslapions's circuit and noticed that I could detect the glitches in TTL mode and CMOS mode. I did the same on a subsequen...

Hi eslapion,


I agree.

Apologies for getting off topic.

Hi eslapion, These look interesting..... https://www.ebay.ca/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=74HC279&_sacat=0 https://www.ebay.ca/itm/M74HC279B1-INTEGRATED-CIRCUIT-ST-THOMSON/202601113596?hash=item2f2bf7a7fc:g:yMUAAOSwpUVcauAa https://www.ebay.ca/itm/IC-BAUSTEIN-74HC279-2071...

Hi eslapion,


Oops, you are right.. I just re edited the comment.


Apologies for that.....

Hi eslapion,


Thanks for looking around..

.

This is the guy "little_diode" who sent this pic in response to my query.

https://www.ebay.ca/usr/littlediode_com ... 7675.l2559


That's all he had I think.....

Hi eslapion,

Thank you for your opinion on the 74HC279 Integrated Circuit.



I will continue to have a look around .. I still have some more avenues let to me......