Interesting off_site dissections:

GitHub emu-russia: dissection of NMOS 65xx CPU core and NES chips //Nintendo Entertainment System
pastraiser.com: 65CE02 dissection
zimmers.net: C64 PLA dissected by Thomas ’skoe’ Giesel

;---

List of chip dissections in our forum:

[Dec 2023] Rockwell R6545R1 CRT controller
[Jul 2023] MOS 8364R7 Amiga Paula //4 channel PCM audio + interrupt controller + analog joysticks + UART + floppy controller
[Mar 2023] CSG 8551R2 HMOS-II implementation of the 6551 UART

[Dec 2022] MOS 5719 Amiga GARY //small CMOS gate array //some CMOS basics explained.
[Dec 2022] MOS 6520 PIA, cousin of MC6820\MC6821 //and of W65C21 somehow.
[Nov 2022] MOS 8521 C64\C128 CIA //BCD TOD, HMOS-II implementation of the 6526
[Oct 2022] MOS 8520 Amiga\1581 CIA //binary TOD
[Jul 2022] MOS 6522 VIA
[Apr 2022] Nintendo Entertainment System PPU\APU Your princess is in another castle.
[Jan 2022] MOS 6525 CBM-II\1551 TPI //6523 is a 6525 subset, 6529 is a 6523 subset.

[Dec 2021] MOS 6509 CBM-II CPU + MMU //full dissection of the NMOS 65xx CPU core.
[Oct 2021] MOS 8726 C64\C128 REU //RAM extention unit
[Jul 2021] MOS 6530 KIM-1 RRIOT //6532 is a 6530 variation.
[Jul 2021] MOS 6702 SuperPET dongle chip
[May 2021] MOS 8501 C16\+4 CPU //C64 8500\6510 is a 8501 subset.

[Sep 2018] MOS 8701 C64 clock generator chip
[Jun 2016] MOS SID C64\C128 famous/infamous sound chip

;---

The stone quarry:

(planned) STMicroelectronics EF9367 PET, NKC Graphic Display Processor
(planned) MOS 8373R4 Amiga ECS-DENISE
(planned) U880 Bugfixed Z80; GDR clone

(microscopic pictures) MOS 6572R1 C64 VIC-II PAL-N latest revision
(microscopic pictures) MOS 6567R9 C64 VIC-II NTSC latest revision
(microscopic pictures) MOS 6569R5 C64 VIC-II PAL
(microscopic pictures) MOS 6526R4 C64\C128 "Old" CIA; NMOS
(microscopic pictures) MOS 6560 VIC-20 VIC-I NTSC
(microscopic pictures) MOS 8360R2 and MOS8360R3 C16\+4 TED
(microscopic pictures) MOS 8365 C16\+4 TED PAL-N
(microscopic pictures) MOS 252535-01 C64C Memory Controller
(microscopic pictures) CSG 8375 Amiga ECS-AGNUS
(microscopic pictures) MOS 8362 Amiga DENISE
(microscopic pictures) MOS 5721 Amiga Bus arbiter
(microscopic pictures) Z80A (Z8400APS)

(vectorization in progress) CSG 6581R4AR C64\C128 SID
(vectorization in progress) WD1772PH02-02 floppy controller
(vectorization in progress) MOS 6561 VIC-20 VIC-I PAL

(vectorized) MOS 8580R5 C64\C128 HMOS-II implementation of the SID
(vectorized) SSI263AP / Votrax SC-02 speech synthesis chip

;---

(dissection in progress) MOS 6571R7 Amiga Keyboard controller. //Microcontroller with 6502 core.


I can confirm that there are four 8 Bit I\O ports and a 16 Bit timer, but I found no shift register.
Address decoder PLA (6b) is sending some of the select signals through the data bus during PHI1.
RAM (7c) and ROM (8c) use a common row address decoder (9b),
and the designers had used an ingenous/devious trick to build that decoder with fewer transistors than one might expect.

To me, the 6502 core looks like a redesign, I'm now trying to capture the mill.
You won't expect a keyboard controller to support decimal mode, but it does.
The status register is crammed into the mill, between PC counters and the data bus driver.
Circuitry of the uppermost 3 Bits in the status register is a bit different from what I had expected...

The designers _literally_ had folded the 6502 PLA to make it fit into the chip space.

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Very nice and handy list - and a glimpse of the future too. Thanks!

"Planned" means:

We already have bought the chips but they are not decapped and pictured (yet).
Depends on motivation and financial situation.

The microscopic pictures of the 6572R1 are ready...

https://cdn.knightlab.com/libs/juxtapos ... 95d9b17862

December 2023: working conditions became too bad to go on with chip dissections, so I had to stop.

April 2024: trying to restart chip dissections.

Working conditions still are bad, but now at least I have suitable coffee again. Woot.

Coffee is good! Suitable coffee must be even better! Glad things have picked up a bit.

Glad situation has improved!

And good coffee of course is a must!

_________________
Author of the GeckOS multitasking operating system, the usb65 stack, designer of the Micro-PET and many more 6502 content: http://6502.org/users/andre/

Ed and André, thanks for the kind words.
It's quite difficult doing things like chip dissectios if one can't focus/concentrate.

;...

Another thing that made it difficult for me to stay focused/concentrated:

I was the owner of an apartment, the renter had ruined it, and I wasn't able to get him out.
Unfortunately, the father of the renter appeared to be CEO of an obscure estate company,
and they had a very good lawyer who is specialised in writing "Cease and desist" letters
(the "Gravenreuth" sort of type).

So when I sent the renter a "proper notice of termination",
I instantly got sued in return, and stumbled into a legalese battle which wasn't over after 2 years.

The only thing I could do "to be able to life a normal live again" was selling apartment + renter.
Financial loss about 16k€ so far in total (not good for my retiremend fund), but I'm happy it's over...
...I think.

Point is, that I bought the apartment from money I put aside from my income over the years,
and me and my parents put some time/work/effort into keeping said apartment in a good condition.
It just is, that some people have absolutely no respect for the time/money/property of others.

I can feel you. I have had a renter, not half as bad as yours, but still threatening to drag me to court. Luckily that is gone. It's really a bad feeling!
I hope for you that it is over and that you can look forward now!
André

_________________
Author of the GeckOS multitasking operating system, the usb65 stack, designer of the Micro-PET and many more 6502 content: http://6502.org/users/andre/

_________________
x86?  We ain't got no x86.  We don't NEED no stinking x86!

André and BDD, thanks for the compassion.

Here in Germany, the law is on the side of the renter, not on the side of the landlord.
To me, the worst thing when flatfootedly stumbling into a legalese battle (without having a legal protection insurance)
involving avocados... err... advocates was, that at some point I had to keep track who said/wrote what to whom/when/why.

After two years, that pile of paper became quite high, and keeping it sorted and updated took me some work/time/effort.
It drove me nuts to waste time with "pushing papers" instead of doing something useful... like dissecting chips, for instance.

The renter had not told us that the police busted the front door (and why), we noticed the damage by accident with a six months delay.
Funny thing is: the renter was stupid enough to throw away the original key cylinder of the door (master keyed system for 114 apartments).

But enough of this madness, now back to the things in life that really count: eventually doing some more 6502 tinkering.