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- CODE (roll) ( "2 3 4 5 4 --> 2 4 5 5". See B311 )
- CX POPx, CX 2 ADDxi, CALLn, lblchkPS @ RPCn, CX 2 SUBxi,
- SI SP MOVxx, SI CX ADDxx,
- DI SI MOVxx, DI 2 ADDxi, STD, REPZ, MOVSB,
- ;CODE
- CODE 2DROP 2 chkPS, SP 4 ADDxi, ;CODE
- CODE 2DUP 2 chkPS,
- AX POPx, BX POPx,
- BX PUSHx, AX PUSHx, BX PUSHx, AX PUSHx,
- ;CODE
- CODE S0 AX PS_ADDR MOVxI, AX PUSHx, ;CODE
- CODE 'S SP PUSHx, ;CODE
- CODE AND 2 chkPS,
- AX POPx, BX POPx, AX BX ANDxx, AX PUSHx, ;CODE
- CODE OR 2 chkPS,
- AX POPx, BX POPx, AX BX ORxx, AX PUSHx, ;CODE
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