----- Original Message ----- From: "André Fachat" <afachat@gmx.de> To: <cbm-hackers@musoftware.de> Sent: Friday, January 11, 2019 1:40 AM Subject: VIA6522 - was: Re: Did Commodore cheat with the quad density floppies? > > > 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. ------------------ Well I misremembered one thing: although some of their chips start with 'R' their revisions are just -xx, not -Rxx like CBM. ;-) I looked through my pile of AIM65 boards and R6522s in my junkbox and found these date codes and Rev no.s (needless to say, duplicate date codes had the same Rev no.): 7927: No suffix 8049: -11 8216: -33 ?! 8330: -31 8408: -31 8439: -31 8530: -31 Is there an easy way to test for the bug(s) ? I'll keep a lookout for that tech note (if it exists ;-) mReceived on 2019-01-11 22:00:59
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