VIA6522 - was: Re: Did Commodore cheat with the quad density floppies?

From: André Fachat <*afachat_at_gmx.de*> Date: Fri, 11 Jan 2019 07:40:20 +0100 Message-ID: <1683ba3d438.27ff.b4d1f2b66006003a6acd9b1a7b71c3b1@gmx.de> · afachat_at_gmx.de

Am 11. Januar 2019 06:36:30 schrieb "Mike Stein" <mhs.stein@gmail.com>:

> ----- Original Message -----
> From: "André Fachat" <afachat@gmx.de>
> To: <cbm-hackers@musoftware.de>
> Sent: Thursday, January 10, 2019 2:11 AM
> Subject: Re: Did Commodore cheat with the quad density floppies?
>
>
>> Well, that's history. Anyone know if there is a fixed CPLD/FPGA VIA?
> -------------
> Does anybody except me think they remember a Rockwell tech note that talked 
> about the VIA bug and mentioned a -Rxx revision that fixed it?

That would be quite interesting. I have never seen any official datasheet 
about it.

Even the WDC65C22 datasheet does not mention it although, as IIRC wikipedia 
states, it should be fixed there.

BTW the WDC65C22N _is_ supposed to be a drop in replacement, even with O.C. 
interrupt line.

> I could be totally wrong, but ISTR that every late model AIM65 came with 
> that sheet; unfortunately it looks like I threw out all of mine.

Would be great if someone could dig that out!

André