thanks for the information, I ordered a few from Poland but I'll have to reduce the speed of the board to 1..2 Mhz frankly I'm mad, I think I'll have to rebuild my board probably with a FTDI chip usb fifo... after the other infamous bug I found in the 65c816 in emulation mode... thanks On 18/10/2023 17:26, Gerrit Heitsch wrote: > 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 22:00:03
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