Routines
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9F99: Draw a NUL-terminated string with a specified style
Adapter entry point: it reorders the registers into the layout the string loop expects and supplies the constant attribute stride of 32 bytes, one attribute row.
Used by the routine at print_message.
Input
A Attribute byte written at each character cell
BC Attribute address
DE Back buffer address of the first character cell
HL String data, NUL terminated
A' Draw style, as taken by draw_char
Output
HL Address of the byte after the NUL terminator
draw_string_with_style 9F99 PUSH BC Push attribute address
9F9A EXX Bank
9F9B POP HL HL' = BC
9F9C LD DE,$0020 DE' = 32
9F9F LD C,A C' = A
9FA0 EXX Bank
9FA1 JR draw_string_core goto draw_string_core
The string is terminated by setting the topmost bit of the final character.
draw_string_screen 9FA3 LD A,$01 A' = 1 Set drawing type (single height, plots to real screen)
9FA5 EX AF,AF'
draw_string_core 9FA6 LD A,(HL) Load a byte and isolate the text part
9FA7 AND $7F
9FA9 PUSH HL
9FAA CALL draw_char
9FAD POP HL
9FAE BIT 7,(HL) Was bit 7 set?, quit if so, otherwise loop
9FB0 INC HL
9FB1 RET NZ
9FB2 JR draw_string_core
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