Getting numeric input

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This is done in about the same way as getting string input. Start by putting the prompt at 821ch:

        ld      de,821ch                ;put the prompt here
        ld      hl,prompt
        ld      bc,prompt_len           ;length of prompt, max = 16

Then call PGMIO_EXEC, but with a different command in ASM_IND_CALL:

        ld      a,1                     ;code for NUMERIC input
        ld      (ASM_IND_CALL),a

        call    PGMIO_EXEC

The input is automatically parsed as an expression, and the result is placed in OP1.

        call    _formDisp               ;display it

prompt:         .db \"Inp:\",0
prompt_len      =   $-prompt"}

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