On 10/18/23 15:04, laughton_at_cyg.net wrote: > It's my understanding that all 65C51's made by WDC are affected, but all > other versions such as mos 6551 are free of the transmit flag bug. Yes, but those have other problems. The NMOS/HMOS 6551 will stop transmitting the moment /CTS goes HIGH. That can be in the middle of a byte being sent. This is documented in the data sheet. As far as I know, only the 65C51 (Rockwell for example) is behaving one would expect. Gerrit > > More on the bug on 6502.org, here: > http://forum.6502.org/viewtopic.php?p=26524#p26524 > > -- Jeff > > On 2023-10-18 08:45, didier_at_aida.org wrote: >> Hi All :) >> >> I made a board with a 65c816 and a 65c51 >> I saw on the web that apparently the w65c51 has bug on the transmit >> flag ... >> is there a way to identify the w65c51 with or without bugs ? >> I checked the plus4 rom code to check how the 6551 was programmed >> >> is this bug only on the w65c51 or also on the mos 6551 ? >> >> my goal was to study how to replace a mos 6502 by a 65c816... on a >> commodore 8032 >> have a board with ram + 64ext on the board and run at 1 Mhz on the I/O >> and faster speed while accessing the ram (8Mhz) >> >> thanks >Received on 2023-10-18 18:00:14
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