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bigmessowires, The straight thru serial cable is likely meant to be used with a manual switch box such as https://www.cablesdirect.com/store/p/2250.aspx

ZuluSCSI works great - I wouldn’t mess with spinning SCSI hard drives again, unless it was a removable cartridge drive.

Is the Ethernet chip clocked off the CPU crystal Q650? On the C610 it is, and overclocking the CPU will make Ethernet unstable.

You can connect the ZuluSCSI to the external port with a SCSI adapter such as the https://store.rabbitholecomputing.com/product-p/idc50f-db25f.htm and place it in a small case.

PowerBooks were too expensive for schools, but an LC with attached screen would probably be far less expensive. Too bad Apple never built it.

Glad you are making progress. If you have a SCSI external case, you can plug the ZuluSCSI in the case and connect it to the external SCSI port

Maybe I was jumping the gun. What exactly does non-working mean? Does you computer see the hard drive after booting up? Does SCSIProbe see the drive? Do you have a boot floppy in the drive or another hard drive attached to the computer?

SCSI ribbon cable damaged? Can you swap it for another cable?

Looks ok. You may want to download System 7.5.5 from this link below, unzip the file and name it HD20.hda and place it on the SD card https://www.savagetaylor.com/downloads/downloads-macintosh/

Nice. Looks like you could easily fit a ZuluSCSI laptop or compact into one of those empty battery bays.

According not MacTracker the 3400C has an internal ATA hard drive and you can see in the video above it’s attached with a custom flex cable (29 minute mark). It should be easier to swap in a larger ATA drive.

Falcon MC utilized a word from the manual as copy protection. I think later versions of Falcon did this also. That’s the likely reason the boxes were stored seperately from the game disc/ manual.

I never had much luck using 400K/800K disks when my preG3 PowerMacs were new, much less 25 years later. Apple had phased out 400K/800K drives in Macs around 1988. If you want to use floppies, the 1.4 MB HD disks are a lot more reliable.

Check the 660AV post last updated yesterday. There is a table on the post, suggesting switches 1 and 4 on, the others off will produce a 640 x 480, 66 Hz, sync on green picture. This is the standard Mac II signal, though other settings may produce a higher rez picture.

The USB version of the Imation LS120 drive requires no drivers under OS9. I‘m concerned you just installed some malware on your computer - remove it.

Confirming the 610 has 512KB of VRAM soldered to the logic board. There are also two memory slots where you can install a pair of 256KB VRAM modules, bumping the VRAM to 1 MB. There is some debate on whether a PRAM battery is needed on this model, but it couldn’t hurt installing one.

it’s probably just an issue with the Apple CDROM driver. I would try installing FWB CDROM Toolkit, whose drivers support more models

The one I’m using is very thin - it’s only 1/4 inch thick. I got it many years ago after purchasing a new, expensive 15 inch multi sync monitor, and requested it from the company’s customer service department.

The 660AV definitely need a battery.

Many SCSI hard drives simply stop working. You should consider a ZuluSCSI or a BlueSCSI replacement.