NMOS/CSG 8364 (PAULA) and 8520 (CIA) datasheets - Page 1
Forum section: electronics / projects

author: Carrington
author_rank: Super Contributor
timestamp: September 08, 2015, 07:03:47 pm
content: Hi guys.I need the datasheet for the NMOS/CSG 8364 (PAULA) and 8520 (CIA), both used in Commodore Amiga computers.Anybody know where I can find them?After a long search I could only find this info:MOS/CSG CIA:s 8520 and 6526 are quite similar devices. 8520 does not have the same "TOD"-clock that 6526 does have. 8520 seems to have more powerful output at some pins, where as outputs from 6526 are capable of sinking only 3.2 mA (min.) or sourcing 200 uA (min.) 1 mA (typ.)Source:http://www.commodorefree.com/magazine/vol3/issue26.htmlAnd the 6526 datasheet:http://www.amiga.serveftp.net/Datasheets/6526_CIA_specification.pdfAny help is welcome, thanks in advance.

author: ShawnD
author_rank: Contributor
timestamp: September 09, 2015, 12:04:00 am
content: I don't think they ever published full datasheets.The registers are covered in theHardware Reference Manual.There is also block diagrams in the back of the A500 manual and maybe the service manuals have more details. I found a bunch athttps://archive.org/details/commodoreamigamanuals?&sort=-downloads.I hope this helps.

author: Carrington
author_rank: Super Contributor
timestamp: September 11, 2015, 04:29:10 pm
content: @ ShawnD: First, thank you very much for your reply.Quote from: ShawnD on September 09, 2015, 12:04:00 amProbably, because after several days I could not find anything.

author: free_electron
author_rank: Super Contributor
timestamp: September 11, 2015, 06:31:29 pm
content: Afaik the 8520 was made by national semi and or generel electric ( ay-3-8520 OR AY-5-8520)

author: Carrington
author_rank: Super Contributor
timestamp: September 13, 2015, 07:26:17 pm
content: Quote from: free_electron on September 11, 2015, 06:31:29 pmHi Vincent, thank you very much for your reply.You are referring to this chip:https://en.wikipedia.org/wiki/AY-3-8500However mine is a different one, I attach some pictures:Thanks again.

author: ralphd
author_rank: Frequent Contributor
timestamp: September 13, 2015, 08:03:22 pm
content: Quote from: Carrington on September 08, 2015, 07:03:47 pmI've seen Dave Haynie posting in the last year or so. He might help you if you contact him.Bill Herd is another person that might have a lead on where to find an 8520 datasheet. He's a regular contributor to Hack-A-Day now.

author: nctnico
author_rank: Super Contributor
timestamp: September 13, 2015, 08:37:46 pm
content: IIRC the manual of the Amiga 500 had full schematics in them.

author: amyk
author_rank: Super Contributor
timestamp: September 13, 2015, 11:55:23 pm
content: Schematics won't help much with what's in the chips...

author: nctnico
author_rank: Super Contributor
timestamp: September 14, 2015, 12:29:53 am
content: Actually they do. They show how to use a chip in a circuit. The programming manual says the rest. It would surprise me if the topic starter is going to use these very old chips in a new mass produced product and since these chips are 100% digital there is no analog part to worry about.

author: Kleinstein
author_rank: Super Contributor
timestamp: September 14, 2015, 05:00:37 pm
content: The 8520 shown above is made by MOS - not a big supprise, as this was a comodore daugther company. The same is probably true for the other costom chips.The circuit diagram helps to get the pin numbers an possibly some details (inverted or not) on the pins. The programming manual of the amiga should have most of the programming side. However there might be parts missing if some function of the chips was left unused, this might not appear in the programming manual.

author: mos6502
author_rank: Frequent Contributor
timestamp: September 14, 2015, 05:20:08 pm
content: How about this?http://raven1.magix.net/8520%20CIA.pdf

author: Carrington
author_rank: Super Contributor
timestamp: September 14, 2015, 05:57:32 pm
content: Thanks toeveryone. The people on this forum is great!@ralphd:Good Idea! I'll try.@mos6502:Intriguing, because that is the 1581's service manual, a 3.5" Disk Drive.I'll be a little more specific:I need to know which port is OC (internal PULL-UPs) and what port is PUSH-PULL type.Also the electrical specification, timing diagrams, etc... You know, all the stuff that can be found on a typical datasheet.Let's see if I'm lucky...Cheers,Carrington.

author: BloodyCactus
author_rank: Frequent Contributor
timestamp: September 15, 2015, 12:49:59 pm
content: Quote from: Carrington on September 14, 2015, 05:57:32 pmwell, that info was never publicly released. You could ask Jens Schönfeld maybe, he has a treasure trove of knowledge.

author: Carrington
author_rank: Super Contributor
timestamp: September 15, 2015, 02:36:04 pm
content: @BloodyCactus:Yesterday I received an email from Bil Herd and Dave Haynie on the subject. These guys are great!And effectively, yes, you're right, that info was never publicly released.Moreover none of these chips had conventional datasheets (in-house datasheets) because they were for internal use only.They had the specs, as is logical, but unfortunately didn't make a copy for the future. A pity.However they confirmed me that the 8520 is a 6525 with a few changes at the request of the Amiga 1000 development team.For example, Dave points out that the 6526 has a BCD-encoded clock, while the 8520's is pure binary. And perhaps other changes were made in the pinout, etc...So, in conclusion, find these documents is almost impossible.Thank you very much for your reply. Thanks to everyone.Cheers,Carrington.

author: pandy
author_rank: Contributor
timestamp: June 24, 2016, 11:57:51 pm
content: PNG hires scan for CSG8520:https://ulozto.net/!MucAqcyV5/specifications-cia-png-zip- archive size approx 60MB.

author: Carrington
author_rank: Super Contributor
timestamp: July 14, 2016, 08:28:51 am
content: Hi "pandy", welcome to the forum.I haven't seen your post before, sorry for the late reply.Amazing, it's just what I was looking for, thank you very much!Where did you find it?Thanks again.

author: pandy
author_rank: Contributor
timestamp: January 14, 2017, 01:44:24 pm
content: Quote from: Carrington on July 14, 2016, 08:28:51 amHello Carrington, thank you.I believe We all ( at least Amiga community ) should thanks this humble guyhttp://eab.abime.net/showpost.php?p=734837&postcount=79.Sorry for late reply - being quite infrequntly on EEVblog (sorry Dave).Cheers

author: silverdr
author_rank: Newbie
timestamp: November 05, 2018, 02:46:44 pm
content: @pandy - thank you for the doc! Do you happen to know if that humble guy scanned other documents mentioned in his post?

author: Prehistoricman
author_rank: Regular Contributor
timestamp: November 05, 2018, 05:22:18 pm
content: Quote from: silverdr on November 05, 2018, 02:46:44 pmYou can view the next page of the thread:http://eab.abime.net/showthread.php?t=38691&page=5The EAB ftp site:http://eab.abime.net/showthread.php?t=43633and their FTP search tool:http://grandis.nu/eabsearch/

author: pandy
author_rank: Contributor
timestamp: December 01, 2021, 09:30:03 pm
content: Hi SilverDream (I assume it is you) - sorry for late reply - to be honest i've registered on forum mostly to provide specification of the 8520.Some documentation available on EAB and from other sources too.I have official CBM specifications (mostly from EAB) for IC's: Alice, Lisa, ECS Denise, Gayle, Agnus NTSC, Agnus PAL, VIDIOT, side to this also some IC internal schematics for Agnus (MOS 1983), Alice (those fromhttps://github.com/nonarkitten/amiga_replacement_project) .Cheers!