On 2/12/24 16:38, A. Fachat wrote: > > Am 12.02.24 um 16:34 schrieb Gerrit Heitsch: >> On 2/12/24 15:27, A. Fachat wrote: >>> >>> Am 12.02.24 um 11:25 schrieb didier derny: >>>> Frankly I don't know why it's a bug or not >>>> The essential is that finally they made a great processor that powered >>>> our machines... >>>> >>>> I am more concerned by the w65c51 and the w65c816 still sold knowing >>>> that the w65c51 is unusable and the w65c816 crippled by bugs In >>>> emulation mode >>>> >>> I know the 6551 has ... problems ... >> >> With the 6551 it depends on the version... The NMOS 6551 has a problem >> with /CTS turning off the transmitter immediately, even if that's in >> the middle of a byte being sent. It's documented in the data sheet. >> >> On the w65C51 the transmitter empty bit doesn't work. >> >> I think the old 65C51 did work properly, but was a bit limited with >> the baud rates. >> >> I'd try to hook up a 16550 to a 6502 if I needed a UART for a new design. > > The 16550 is my default actually for many years now. Back in my Amiga days, I used a Bridgeboard to use an ISA I/O card from AmigaOS. UART was a StarTech ST16C650, 32 Bytes FIFO, no detectable CPU load during full speed downloads. Problem was, it came only in PLCC and the card had a DIP socket. Making an Adapter was no fun. GerritReceived on 2024-02-12 18:00:05
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