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⌂ ∞ ▽ Revs on the BBC Micro

Screen buffer: ldaDrawByte

       Name: ldaDrawByte                                             [Show more]
       Type: Variable
   Category: Screen buffer
    Summary: Low address bytes of the LDA #0 instructions in the DRAW_BYTE
             macros, for use when drawing track lines around the dashboard

    Context: See this variable in context in the source code
 References: This variable is used as follows:
             * DrawTrackView (Part 2 of 4) uses ldaDrawByte
             * DrawTrackView (Part 3 of 4) uses ldaDrawByte




.ldaDrawByte

IF _ACORNSOFT OR _4TRACKS

 EQUB &1C               \ Line 0 is unused and contains workspace noise

ELIF _SUPERIOR OR _REVSPLUS

 EQUB &28               \ Line 0 is unused and contains workspace noise

ENDIF

 EQUB 8 * 17 + 5        \ Line  1 = LO(address) of LDA #0 in DRAW_BYTE 34
 EQUB 7 * 17 + 5        \ Line  2 = LO(address) of LDA #0 in DRAW_BYTE 33
 EQUB 7 * 17 + 5        \ Line  3 = LO(address) of LDA #0 in DRAW_BYTE 33
 EQUB 7 * 17 + 5        \ Line  4 = LO(address) of LDA #0 in DRAW_BYTE 33
 EQUB 7 * 17 + 5        \ Line  5 = LO(address) of LDA #0 in DRAW_BYTE 33
 EQUB 7 * 17 + 5        \ Line  6 = LO(address) of LDA #0 in DRAW_BYTE 33
 EQUB 6 * 17 + 5        \ Line  7 = LO(address) of LDA #0 in DRAW_BYTE 32
 EQUB 6 * 17 + 5        \ Line  8 = LO(address) of LDA #0 in DRAW_BYTE 32
 EQUB 6 * 17 + 5        \ Line  9 = LO(address) of LDA #0 in DRAW_BYTE 32
 EQUB 6 * 17 + 5        \ Line 10 = LO(address) of LDA #0 in DRAW_BYTE 32
 EQUB 6 * 17 + 5        \ Line 11 = LO(address) of LDA #0 in DRAW_BYTE 32
 EQUB 5 * 17 + 5        \ Line 12 = LO(address) of LDA #0 in DRAW_BYTE 31
 EQUB 5 * 17 + 5        \ Line 13 = LO(address) of LDA #0 in DRAW_BYTE 31
 EQUB 5 * 17 + 5        \ Line 14 = LO(address) of LDA #0 in DRAW_BYTE 31
 EQUB 5 * 17 + 5        \ Line 15 = LO(address) of LDA #0 in DRAW_BYTE 31
 EQUB 4 * 17 + 5        \ Line 16 = LO(address) of LDA #0 in DRAW_BYTE 30
 EQUB 4 * 17 + 5        \ Line 17 = LO(address) of LDA #0 in DRAW_BYTE 30
 EQUB 4 * 17 + 5        \ Line 18 = LO(address) of LDA #0 in DRAW_BYTE 30
 EQUB 4 * 17 + 5        \ Line 19 = LO(address) of LDA #0 in DRAW_BYTE 30
 EQUB 3 * 17 + 5        \ Line 20 = LO(address) of LDA #0 in DRAW_BYTE 29
 EQUB 3 * 17 + 5        \ Line 21 = LO(address) of LDA #0 in DRAW_BYTE 29
 EQUB 3 * 17 + 5        \ Line 22 = LO(address) of LDA #0 in DRAW_BYTE 29
 EQUB 3 * 17 + 5        \ Line 23 = LO(address) of LDA #0 in DRAW_BYTE 29
 EQUB 2 * 17 + 5        \ Line 24 = LO(address) of LDA #0 in DRAW_BYTE 28
 EQUB 2 * 17 + 5        \ Line 25 = LO(address) of LDA #0 in DRAW_BYTE 28
 EQUB 2 * 17 + 5        \ Line 26 = LO(address) of LDA #0 in DRAW_BYTE 28
 EQUB 2 * 17 + 5        \ Line 27 = LO(address) of LDA #0 in DRAW_BYTE 28
 EQUB 1 * 17 + 5        \ Line 28 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 1 * 17 + 5        \ Line 29 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 1 * 17 + 5        \ Line 30 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 1 * 17 + 5        \ Line 31 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 1 * 17 + 5        \ Line 32 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 1 * 17 + 5        \ Line 33 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 1 * 17 + 5        \ Line 34 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 1 * 17 + 5        \ Line 35 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 1 * 17 + 5        \ Line 36 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 1 * 17 + 5        \ Line 37 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 1 * 17 + 5        \ Line 38 = LO(address) of LDA #0 in DRAW_BYTE 27
 EQUB 0 * 17 + 5        \ Line 39 = LO(address) of LDA #0 in DRAW_BYTE 26
 EQUB 0 * 17 + 5        \ Line 40 = LO(address) of LDA #0 in DRAW_BYTE 26
 EQUB 0 * 17 + 5        \ Line 41 = LO(address) of LDA #0 in DRAW_BYTE 26
 EQUB 0 * 17 + 5        \ Line 42 = LO(address) of LDA #0 in DRAW_BYTE 26
 EQUB 0 * 17 + 5        \ Line 43 = LO(address) of LDA #0 in DRAW_BYTE 26