I managed to get my 600 to run SS - sort of.. Here is what is required:

ShapeShifter 3.5 or 3.6
The Apollo A620 Accelerator - 25Mhz 68EC020/882
8MB of Fast Ram, in a single SIMM.
util/boot/addmem301.lha (also on AmiNetCDROM #4)

Install SS in the normal manner, then install addmem301.

Here are the first few lines of the Startup-sequence, 
to show the usage:

--------------------------xxxxxxxxx--------------------
;$VER: Startup-Sequence_HardDrive 40.2 (25.2.93)
; Startup-Sequence for hard drive systems
; A600Tower

SetPatch QUIET
C:Version >NIL:
C:AddBuffers >NIL: DF0: 15
FailAt 21

C:MakeDir RAM:T RAM:Clipboards RAM:ENV RAM:ENV/Sys 
C:Copy >NIL: ENVARC: RAM:ENV ALL NOREQ

Assign >NIL: ENV: RAM:ENV
Assign >NIL: T: RAM:T
Assign >NIL: CLIPS: RAM:Clipboards
Assign >NIL: REXX: SYS:REXX S: ADD
Assign >NIL: PRINTERS: DEVS:Printers
Assign >NIL: KEYMAPS: DEVS:Keymaps
Assign >NIL: LOCALE: SYS:Locale
Assign >NIL: LIBS: SYS:Classes SYS:Libs2 ADD
Assign >NIL: HELP: LOCALE:Help DEFER

Resident >NIL: C:Assign PURE
Resident >NIL: C:Execute PURE

dh0:cc/prepareemul a1200
dh0:cc/addmem <>nil: start $200000 end $a00000 

BindDrivers
C:Mount >NIL: DEVS:DOSDrivers/~(#?.info)
--------------------------xxxxxxxxx--------------------


Settings:
---------

I use a two color desktop, with refresh rate 1. The system runs 
quickly. Filedisks and device disks work normally. My SS Boot partition 
is on a SCSI drive. My ZIP drive and Dell HD floppy are completely 
useable from SS. So far, I have not been able to access my CDROM. I'm 
working on it.


Notes:
------

Addmem requires ENV: to be established before it can be invoked.

Use the latest version of PrepareEmul.

PrepareEmul needs the a1200 switch.

My system has 3.1 on ROM. Softkicking may be require a different
procedure. 

My 600 has 2MB of CHIP memory.

SYS7.0.1 works. I have not tried 7.5.3.

After I first got SS running, I had some occasional crashes on shut 
down. I didn't think too much about this because SS on my 1200 does 
the same thing. ShapeShifter would crash and unvalidate the partition 
SS lives in. I think the PRAM file was being screwing up. I got 
around the unvalitating problem by changing the protection bits on 
the PRAM file to "R"ead only.

After using SS on the 600 for a few weeks, the situation has 
deteriorated to the point where SS crashes on shut down every time. 

I do not know what causes this. I hoped the upgrade to 3.6 would cure 
the problem, but it did not. 

All the software I have tried works. This includes MS's Flight 
Simulator.

Because the A620 is limited to 8MB of RAM, large programs are 
impractical.

If you have any comments, email me at:
colin@znet.com