Yes, OS3.9 once installed will give that much, but you can't get there without using OS3.1; that is the issue (which doesn't see large drives, and has to be set up to see CD drives). The CD option for the CS MK3 and CSPPC is not robust enough when I have used it (ergo, IMHO) to install OS3.9 straight. It does work sometimes for an OS4.1 install using the boot floppy, and sometimes the CD isn't seen on boot. It is probably not the heat, but the humidity.