How to unsqueeze
Sometimes an application or program is set up in such a way as to make UnSqueeze fail to
unsqueeze the code. Or alternatively your unsqueezer may fail for one reason or another.
But it is still perfectly possible to unsqueeze the code.
D. Ruck wrote how to do this in comp.sys.acorn.programmer. I reproduce the original
Message ID: comp.sys.acorn.programmer <email@example.com>
You could always do it by hand:- 1) F12 2) *Load <program> 3) *MEMORYI 8000 +4 note address1 in the BL instruction 4) *MEMORYI <BL address1> +100 look for MOV PC, Rx instruction, note registerX and address2 5) *BreakSet <instruction address2> 6) *GO 8000 (runs, stops at breakpoint) 7) *ShowRegs Note address3 in the Rx register 8) *MemoryI <Rx address3> look for MOV PC, Ry instruction, note registerY and address4 9) *BreakSet <instruction address4> 10) *Continue (continues, stops at breakpoint) 11) *ShowRegs Note address in the Ry register 12) If Ry is &8004 its an AIF format, so *Save <program> 8000 <address3> *SetType <program> FF8 Other wise is a plain executable *Save <program> 8000 <address3> <address4> ---druck
The above doesn't seem to apply to the newer types of squeezed file. So here's my suck'n'see method.
1. Note the size of the WimpSlot. Then convert it to hex-&8000. Ie, a 324K wimpslot would be 49000. 2. *Load the program. 3. *MemoryI 8000 +4 Note the address in the BL instruction. 4. *MemoryI <BL address> +100 Look for ADD PC, Rx,#&xx It should follow SWI "XOS_SynchroniseCodeAreas". Note the register and what is added. Note the address of this instruction. 5. *BreakSet <instruction address> 6. *Go 8000 7. If you don't Darren Salt's Debugger Plus, type *ShowRegs. 8. Note the value of the register you noted in step 4. Now add to the value of the register, the amount added in step 4. This is your new address. 9. *MemoryI <new address> Look for B &8000 after "XOS_SynchroniseCodeAreas". Note that address. 10. *BreakSet <B &8000 instruction address> 11. *Continue 12. *Save <filename> 8000 +<slot value from step 1> I think you can replace the slot value with the address from step 8. Try it.