6502.org

Posted: **Sat Sep 30, 2023 9:35 am**

Hi @ll,

maybe this one is interesting for some of you:

MOS internal Documentation about 6522 problems and possible corrections (that were never made).

MCS6522_Problems_and_corrections.pdf: (643.44 KiB) Downloaded 115 times

Please excuse the slightly too small scan. I don't have a Scanner for this paper format (yet).

/Frank

Posted: **Sat Sep 30, 2023 10:28 am**

Very interesting! I came across problem 3 quite recently. I believe problem 8 was solved as it is possible to clear individual IFR bits now.

6502.org

From the vaults: MOS 6522 problems and corrections

From the vaults: MOS 6522 problems and corrections

Re: From the vaults: MOS 6522 problems and corrections