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I recapped an M5126 and swapped its PMGR chip and everything seems to be working now, except internal SCSI termination power. With it booted, I show 12V on SCSI pins 31 and 32 but only about 2.3V on pins 33 and 34. The middle pin on the floppy interface shows 5.2V, as do other 5V things like...

I can't seem to get any traffic flowing between the modem or printer ports on my PB180, talking to an Apple Modem 300/1200 or any other RS422 device (or RS232 devices through an RS232->RS422 converter that works on my Mac Plus) through an Apple DIN8->DB9 connector. It does have an internal...