Re: Making Encoded Bits Human Readable
Just for fun, here is yet one more variation on Peter's scheme, using only S/360 instructions. In the comments, YY and ZZ represent the two bit pairs of interest, lower case x represents bits or bytes of unknown value. Bit strings are enclosed in square brackets. Bytes are separated by underscore characters. XR R14,R14 R14 = 00_00_00_00 IC R14,BYTE R14 = 00_00_00_[YYZZ] SRDL R14,6(0) R14 = 00_00_00_[00YY] * R15 = [ZZxx]_xx_xx_xx SRL R15,30(0) R15 = 00_00_00_[00ZZ] LA R14,X'F1'(,R14) * Scale x'00' through x'03' LA R15,X'F1'(,R15) * to x'F1' through x'F4'
Re: Making Encoded Bits Human Readable
Making Peter's approach even more old school, use R14 and R15 instead of R0 and R1, and do the character conversion stuff with Load Address instead of Add Halfword Immediate. ICM R14,B'1000',BYTE Put the byte into bits 0-7 SRDL R14,30 Move BYTE.0-1 to reg 14.30-31, * zeroing reg 14.0-29 * BYTE.2-3 to reg 15.0-1 SRL R15,30 Move BYTE.2-3 to reg 15.30-31, * zeroing reg 15.0-29 LA R14,X'F1'(,R14) 0-3 => C'1'-C'4' LA R15,X'F1'(,R15) STC R14,TARGET0 STC R15,TARGET1 BYTE DS X
