This package maintain current cursor position and current line start, so caller don't have to compute screen address at each character.
I.e. disp_chr works like &bb5a (but doesn't preserve registers !).
All *_at version are shortcut, calling disp_locate beforehand.
All *_nl version are shortcut, calling disp_nl afterward.
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Table des matières
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+0 disp_init
Initialize screen parameters for text display.
Set write location to &C000.
In: A = Screen width in words (40 standard, 32 for Monogams)
Out: BC, DE, HL corrupted.
+3 disp_cls
Clear screen fast, and set write location to &C000
Out: A, BC, DE, HL corrupted.
+6 disp_locate_scr
Set write location (position in screen, eg &C000), which also will be used as start of line.
In : DE = location (from &C000 to &C7ff)
Out: All registers preserved.
+9 disp_locate_x
Change location to "start of current line + x".
In : A = x
Out: A corrupted, all other registers preserved.
+C disp_locate_inc
Increment location (typically used for space when we know screen was cleared, so we don't have to explictly write a space character).
Out: All registers preserved.
+f disp_chr
Display chr at current location.
In : A=chr. Bit 7 set for video inverse.
Out: A, BC, DE, HL, IX, IY corrupted.
+12 disp_chr_at
+15 disp_chr_shaded
+18 disp_chr_shaded_at
+1B disp_text
Display zero terminated text at current location.
In : BC= zero terminated string.
Out: BC= past string (after zero).
A, DE, HL, IX, IY corrupted.
+1e disp_text_at
+21 disp_text_shaded
Like disp_text, but using shaded font.
+24 disp_text_shaded_at
+27 disp_text_inv
Like disp_text, but with video inversion.
+2a disp_text_inv_at
+2d disp_text_nl
+30 reserved.
+33 reserved.
+36 disp_inline
Display 0 terminated text placed after the call.
call disp_inline:byte "Wouh!",0 ;Don't forget the 0 !
+39 disp_inline_at
+3C disp_inline_nl
+3F reserved
+42 disp_nl
Go at start of next line.
+45 reserved
+48 disp_deci_a
Display decimal value of A, skipping leading 0s.
NB: Leading 0s are not replaced by spaces, so the result is left justified.
+4B disp_deci_a_inv
+4E disp_deci_a_shaded
+51 disp_deci_hl
As disp_deci_a but for 16 bits value in HL.
+54 disp_deci_hl_inv
+57 disp_deci_hl_shaded
+5a disp_hexa_a
Display hexadecimal value of A, leaving leadings 0s, so it always take 2 chars.
+5d disp_hexa_a_inv
+60 disp_hexa_a_shaded
+63 disp_hexa_hl
As disp_hexa_a bit for 16 bits value in HL.