I was able to find a 128 mg stick for my CC. And if missing, you can install the math co processor. I wanted to install 7.1 but was unable to so. I think one needs to know the trick to installing it. I even bought original CC floppy install disks, but I could not make it install. I am sure I was doing something wrong. So I installed 7.6.1. I installed a CF2SCSI adapter card for a hard drive. I always use the SanDisk branded cards, no others. I ended up using the SanDisk 16 GB Extreme Pro CF card (about $35 on Amazon). I partitioned it into 6 partitions. This gives me more hard drive space than one could ever hope or. Many folk are now installing microSD 2 SCSI card adaptors, and I suspect that also work just fine.
I installed free FTP software on my 64 bit windows 10 box. Using the browsers in Windows 10, I go to places (like MacintoshGarden) and down load software into windows 10. Then, using free FTP software running under 7.6.1, I FTP the software to the CC.
If you find a CCII logic board, your CC will run much faster.
My original idea was to run 7.1 on one partition, and then 7.5.5 on another, and then 7.6.1 on a third. If I was running the CCII logic board in my CC, I would have put 7.1 on one partition and 7.6.1 on another. But in the middle of all of this, I did the upgrade to 640 X 480. I now have a LC 575 logic board in my CC. I upgraded the CPU to a full 68040 and just by accident I found a fan and heat sinc that fit this CPU. I installed that and took power from the wiring harness for the hard drive (which now is a CF card) to power the small quiet fan on top of the 68040.
Some literature I have read says that the full 68040 runs a little hot so that is why I put a heat sinc and fan on top of it.
I did find a drop in replacement fan for the CC and installed it. It moves quite a bit more air then the original, but I could hear the fan. So I did the CPU thing and re installed the original fan.
After the LC 575 upgrade I moved to 8.1 and 7.5.6. Next time I play with my CC, I will try to install 7.1 yet again.
Some folks complain about the small text size (on that lovely Sony CRT monitor) if you do the 640 X 480 mod. I am sure it is a personal choice, but for me it is a non issue. That color monitor is awesome.
The CF or micro SD cards draw far less current than a machincal hard drive. I like that.
Keep us updated.
mraroid