Other CDC machines
the 6600 was a johnny-come-lately; I think Adelaide uni had one. I worked at the Commonewealth Bureau of Census and Statistics, what had a brace of 3200s, some 3300s, a 3500 and a 3600.
The 3200s ran SCOPE and essentially program at a time; there was also a background, interrupt-driven program to mange off-line printing.
The 3300s came (at our establishment) in two flavours, the A running MSOS, a bit more capable than SCOPE and having disk, and the B, bigger and running a full multitasking OS, MASTER. It did clever things with special registers to extend memory addressing.
The 3600 ran SCOPE which wans't mich like the 3200-scope or theat which appeared later in the 60-bit boxes.
The low 3000 series (up to 3500) had 32-bit words, the high 3000s (except I think there as a 48-bit 3400) had, um, 48-bit words.
the little 3200 in Perth was the first one I used, I later programmed the 3500 (in compass) and the 3600 in fortran.