=> R0 = value to be converted
R1 = pointer to buffer for resulting string
R2 = size of buffer
<= R0 = pointer to buffer (R1 on entry)
R1 = pointer to terminator
R2 = free bytes in buffer
This SWI converts a value into an unsigned string of decimal characters with space separators every thousand, though as the largest number that can be passed in 1 byte is less than a thousand it behaves identically to OS_ConvertCardinal1. The number can be 0 to 255 (3 characters).
See PRM 1, page 469.
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