The BBC and Master Computer Public Domain Library

Save Integer to Address

Submitted by Steve Fewell

Routine: iout
Name: Save Integer to Address
Starting Address: &B347
Entry criteria: &37 and &38 (lo, hi) contain the address of the first byte of the memory location to store either the 32-bit Integer from the IWA (4 consecutive bytes required), or the 8-bit Integer from the IWA (1 byte required). &39 must contain zero if an 8-bit result is required, otherwise a 32-bit result is assumed.
Exit: The 1 or 4 byte memory location specified by &37 and &38 contain a copy of the contents of the IWA.

Description:
Saves a copy of the IWA to the memory location specified by &37 and &38. The least significant byte of the IWA (&2A) is copied first. If &39 contains zero, the routine then exists as the 8-bit integer in &2A has been copied to the requested location.

Otherwise, the rest of the Integer in the IWA is copied into the 3 subsequent bytes of the address pointed to by &37 and &38.

Disassembly for the Save Integer to Address routine