=> R0 = 129
R1 = 0
R2 = &FF
<= R1 = value identifying OS
R2 = 0
OS_Byte 129 Operating System version identifiers
R1 value Version
&A0 Arthur 1.20
&A1 RISC OS 2.00
&A2 RISC OS 2.01
&A3 RISC OS 3.00
&A4 RISC OS 3.10, 3.11
&A5 RISC OS 3.50
&A6 RISC OS 3.60
&A7 RISC OS 3.70, 3.71
&A8 RISC OS 3.80, 4.0X
&A9 RISC OS 4 Select
&AA RISC OS 5.XX
&AE Pyromaniac
&AF Springboard
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