what? that's useless! this is one thing apple does peeve me off about. for no reason, they change all their specs so that their technology is not compatible over a gap of more than a few years.
which one's the serial port? is it the circular one to the right of the scsi one? that's something i am a little lost about.
Mac OS 8.6, which from what I understand is one of Apple's worst OS releases.
You can download System 7.5.5 for free from Apple's web site in their section of obsoleted software; I used floppies. It helps to have another Mac in the process to format the discs as HFS and also uncompress them while maintaining resource forks and other classic irritations.
[calum@localhost MacOS_System7.5]$ lsDisk_Copy_6.3.3.smi.bin System_7.5.3_06of19.part.biniCab_Pre2.97_English_68k.sit System_7.5.3_07of19.part.binMacDraw.dsk.sea.hqx System_7.5.3_08of19.part.binstuffit_expander_55.hqx System_7.5.3_09of19.part.binSys_7.5.5_Update-1of3.sea.hqx System_7.5.3_10of19.part.binSys_7.5.5_Update-2of3.sea.hqx System_7.5.3_11of19.part.binSys_7.5.5_Update-3of3.sea.hqx System_7.5.3_12of19.part.binSys_7.5.5_Update-Q_and_A.txt System_7.5.3_13of19.part.binSys_7.5.5_Update_Tips.txt System_7.5.3_14of19.part.binSys_7.5.5_Update.txt System_7.5.3_15of19.part.binSystem_7.5.3_01of19.smi.bin System_7.5.3_16of19.part.binSystem_7.5.3_02of19.part.bin System_7.5.3_17of19.part.binSystem_7.5.3_03of19.part.bin System_7.5.3_18of19.part.binSystem_7.5.3_04of19.part.bin System_7.5.3_19of19.part.binSystem_7.5.3_05of19.part.bin