If you have APAR PH38969 (from July 2021) installed, HLASM supports the new option TYPECHECK(NOSIGNED) which bypasses checking for whether an immediate operand value is signed or not. This allows a signed value to be used for an unsigned immediate operand and the other way round, provided that the value is still within the valid range for the size of the operand field.
This is safer than the old trick of using TYPECHECK(NOMAGNITUDE) in such cases as it does not tolerate values which are outside the valid range. However, as it is effectively a way of quietly hiding a minor error, it is not an ideal way to write code. Jonathan Scott, HLASM IBM Hursley, UK
