Check your cable.
You specifically will need an Imagewriter I to DIN-8 cable. I tried unsuccessfully to get an Imagewriter I on a Mac years ago, and it didn't work. Turns out, I was using a modem cable. The pins fit, but the cable wasn't the right one. (I had a similar experience with a DB-9 to DIN-8 ImageWriter II trial on a 512Ke).
Imagewriter Is do print to newer Macs. I used one on a PowerBook 190 last year.
You specifically will need an Imagewriter I to DIN-8 cable. I tried unsuccessfully to get an Imagewriter I on a Mac years ago, and it didn't work. Turns out, I was using a modem cable. The pins fit, but the cable wasn't the right one. (I had a similar experience with a DB-9 to DIN-8 ImageWriter II trial on a 512Ke).
Imagewriter Is do print to newer Macs. I used one on a PowerBook 190 last year.