| From: Anthony de Boer via talk <[email protected]> | The FTDI USB-Serial adapters were very good, but then the market got flooded | with cheap PL2303-based ones that are horrible, losing whole swathes of text | during fast screen updates. They're generally only okay for slow traffic.
What does that mean exactly? The serial-to-USB dongles are not connected to the screen so "fast screen updates" isn't exactly a dongle function. Are you saying that they get over-run during fast or sustained transmission? That sounds like a driver problem. Even in the old days, overrun was too easy with some serial input ports. Original UARTs were double buffered. 8250's like in the original PC had deeper buffers. If you don't have deeper buffers, you need the OS to have very quick real-time response to serial port interrupts. Old-timer stories -- feel free to ignore: My Kaypro II could handle 9600 terminal emulation only because I rewrote parts of the firmware (CP/M BIOS in EPROM) for faster screen output and wrote my own terminal emulator to use serial port interrupts. The NABU 1600 could handle 9600 serial input only because Sheila Crossey of HCR wrote some code in the UNIX kernel to handle serial input in a pseudo-DMA way. --- Post to this mailing list [email protected] Unsubscribe from this mailing list https://gtalug.org/mailman/listinfo/talk
