On Sun, 25 Jan 2015, I wrote: > > I've soldered up mini-DIN8 to DB9 cables in the past but it is fiddly > and time consuming. (The Mac serial ports are RS-422 but they become > RS-232 compatible by grounding the appropriate pin.) In my experience it > is easier to find an old serial printer (aka cross-over) cable: these > are male to male, mini-DIN8 to mini-DIN8, DTR to DTR.
Oops. I meant, DTE to DTE, aka "cross-over" or printer cable, as opposed to DTE to DCE which would be a modem cable. -- > > A lot of low-end Macs were bundled with low-end Apple or HP inkjets, with > such a serial cable. An equivalent cable was used with Newtons and > QuickTake digital cameras. They are common, and can also be used to create > a two-node localtalk network between any two macs. > > The Keyspan adapter, part no. USA-28X is the one I use; it's well > supported on every operating system of interest to me. You can find all > this gear for sale on ebay. > > But this bug you are chasing looks to be earlier than any serial port > output; if your kernel has CONFIG_EARLY_PRINTK enabled, then the screen > will be painted black before anything is sent to the serial port. Any > character sent to the serial port will be simulataneously painted on the > screen in white. > > It looks to me like the bug you are chasing is an early unhandled > interrupt, and may be a bootloader bug. If you've already tried unpacking > the gzipped kernel, and tried disabling AppleTalk (see Chooser in the > Apple menu), then lastly I'd try disabling all extensions (restart with > shift key pressed). > > -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: https://lists.debian.org/[email protected]
