CALL¶

Function¶

CALL allows a machine code subroutine or an existing routine in HUNTER’s housekeeping package to be called from Basic and executed.

D=CALL(N)

where D is a variable

N is a Call Address

10 A=CALL(0)
20 B=CALL(V)

where V is the address to be called

Switches execution to the program located at the location specified. The call in line 10 causes a restart of the HUNTER’S software.

Warning

Use CALL only as indicated in Machine Code Calls. Use of unspecified calls will crash HUNTER, resulting in loss of data, etc.

When control has passed back to Basic from a machine code program, then D = the final number stored in the Z80 accumulator when the program returns.