| Routines

09600: THE 'SCANNING ATTRIBUTES' SUBROUTINE

Used by the routine at S_ATTR.
S_ATTR_S | 09600 | CALL STK_TO_BC | x to C, y to B. Again, 0<=x<=23; 0<=y<=31.
| 09603 | LD A,C | x is copied to A and the number 32*(x mod 8)+y is formed in A. 32*(x mod 8)+INT (x/8) is also copied to C.
| 09604 | RRCA
| 09605 | RRCA
| 09606 | RRCA
| 09607 | LD C,A
| 09608 | AND 224
| 09610 | XOR B
| 09611 | LD L,A | L holds low byte of attribute address.
| 09612 | LD A,C | 32*(x mod 8)+INT (x/8) is copied to A.
| 09613 | AND 3 | 88+INT (x/8) is formed in A.
| 09615 | XOR 88
| 09617 | LD H,A | H holds high byte of attribute address.
| 09618 | LD A,(HL) | The attribute byte is copied to A.
| 09619 | JP STACK_A | Exit, stacking the required byte.