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acme/ACME_Lib/cbm/c128/vdc.a

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;ACME 0.95
!ifdef lib_cbm_c128_vdc_a !eof
lib_cbm_c128_vdc_a = 1
; there are three different versions of the C128's Video Display Controller:
; v0: VDC 8563 R7A in C128 and C128-D
; v1: VDC 8563 R8/R9 in C128 and C128-D
; v2: VDC 8568 in C128-DCR
; 8563 and 8568 have different pinouts, so do not try to use one of them on a
; board intended for the other!
; hardware differences:
; the 8563 uses external circuitry to convert RGBIHV to monochrome/luminance.
; the 8568 does a part of this internally and therefore needs fewer external
; components.
; the 8568 has an additional register (r37) to change sync polarities.
; software differences:
; the horizontal scroll bits of r25 differ between v0 and v1/v2: in v0, set these
; bits to zero. in v1/v2, set these bits to the same value as bits4-7 of r22.
; the additional register r37 can be ignored (as the C128 kernal does).
; access macros:
!macro vdc_lda {
- bit vdc_state
bpl -
lda vdc_data
}
!macro vdc_sta {
- bit vdc_state
bpl -
sta vdc_data
}
!macro vdc_ldx {
- bit vdc_state
bpl -
ldx vdc_data
}
!macro vdc_stx {
- bit vdc_state
bpl -
stx vdc_data
}
!macro vdc_ldy {
- bit vdc_state
bpl -
ldy vdc_data
}
!macro vdc_sty {
- bit vdc_state
bpl -
sty vdc_data
}
; color codes:
; These are the colors officially available on the C128 - the same names as if
; using a C64's VIC, but different codes of course.
; color name RGBI VIC equivalent
vdccolor_BLACK = %.... ; 0
vdccolor_WHITE = %#### ; 15
vdccolor_RED = %#... ; 8
vdccolor_CYAN = %.### ; 7
vdccolor_PURPLE = %#.## ; 11
vdccolor_GREEN = %.#.. ; 4
vdccolor_BLUE = %..#. ; 2
vdccolor_YELLOW = %##.# ; 13
vdccolor_ORANGE = %#.#. ; 10 (on VDC, this is in fact a dark shade of purple)
vdccolor_BROWN = %##.. ; 12
vdccolor_LRED = %#..# ; 9
vdccolor_GRAY1 = %.##. ; 6 (on VDC, this is in fact a dark shade of cyan)
vdccolor_GRAY2 = %...# ; 1 (this is almost, but not quite, entirely black)
vdccolor_LGREEN = %.#.# ; 5
vdccolor_LBLUE = %..## ; 3
vdccolor_GRAY3 = %###. ; 14
; The following alternative names are much easier to remember when you're used
; to writing programs for the VDC: There are eight main colors, and each one is
; available in a light and a dark shade - even black and white!
; primary colors RGBI code
vdccolor_DRED = %#...
vdccolor_DGREEN = %.#..
vdccolor_DBLUE = %..#.
vdccolor_LRED = %#..#
vdccolor_LGREEN = %.#.#
vdccolor_LBLUE = %..##
; secondary colors RGBI code
vdccolor_LCYAN = %.###
vdccolor_LMAGENTA = %#.##
vdccolor_LYELLOW = %##.#
vdccolor_DCYAN = %.##.
vdccolor_DMAGENTA = %#.#.
vdccolor_DYELLOW = %##..
; black & white RGBI code
vdccolor_DBLACK = %....
vdccolor_LBLACK = %...#
vdccolor_LWHITE = %####
vdccolor_DWHITE = %###.
; if you don't like the concept of shaded black/white, then use these:
; gray level RGBI code
vdccolor_BLACK = %.... ; "dark black" => "black"
vdccolor_DGRAY = %...# ; "light black" => "dark grey"
vdccolor_LGRAY = %###. ; "dark white" => "light grey"
vdccolor_WHITE = %#### ; "light white" => "white"
; attribute flags (2rufRGBI)
vdcattr_2ND = %#....... ; second character set
vdcattr_REVS = %.#...... ; reverse mode
vdcattr_UL = %..#..... ; underline
vdcattr_FLASH = %...#.... ; flash
vdcattr_R = %....#... ; red
vdcattr_G = %.....#.. ; green
vdcattr_B = %......#. ; blue
vdcattr_I = %.......# ; intensity
!address {
; direct registers
vdc_state = $d600 ; READING this location yields status flags, see below
vdc_reg = $d600 ; WRITING this location selects an indirect register
vdc_data = $d601 ; data of selected indirect register
}
; status flags in vdc_state:
vdcstate_READY = %#....... ; RAM access is finished
vdcstate_LIGHTPEN = %.#...... ; light pen has been activated
vdcstate_IN_BORDER = %..#..... ; electron beam is in upper or lower border
vdcstate_VERSIONMASK = %...##### ; vdc version (0, 1 or 2)
; indirect registers (default value, see $e179 in C128 kernal)
vdcr_htotal = $00 ; 126 (127 for PAL, depends on kernal version) characters per line, minus one
vdcr_columns = $01 ; 80 characters per line, actually displayed
vdcr_hdisp = $01
vdcr_hsync_pos = $02 ; 102 character position to send horizontal sync in
vdcr_syncwidth = $03 ; $49 4b vertical, 4b horizontal
vdcr_vtotal = $04 ; 32 (39 or 38 for PAL, depends on kernal version) character lines per screen, minus one
vdcr_vadjust = $05 ; 0 additional scan lines per screen (to fix timings)
vdcr_lines = $06 ; 25 character lines per screen, actually displayed
vdcr_vdisp = $06
vdcr_vsync_pos = $07 ; 29 (32 for PAL) character line to send vertical sync in
vdcr_interlace = $08 ; 0 interlace mode (0=2=std, 1=jitter, 3=interlace)
vdcr_charheight_total = $09 ; 7 5b total, minus one
vdcr_crsr_start = $0a ; $20 2b mode, 5b scanline
vdcr_CRSRSTART_MODE_MASK = %.##.....
; vdcr_CRSRSTART_MODE_FIXED = %........ ; fixed cursor
vdcr_CRSRSTART_MODE_OFF = %..#..... ; invisible
vdcr_CRSRSTART_MODE_FAST = %.#...... ; flashing with 1/16 of refresh freq
vdcr_CRSRSTART_MODE_SLOW = %.##..... ; flashing with 1/32 of refresh freq
vdcr_crsr_end = $0b ; 7 5b scanline
vdcr_display_hi = $0c ; 0 RAM address of display buffer
vdcr_display_lo = $0d ; 0
vdcr_crsr_hi = $0e ; 0 RAM address of cursor
vdcr_crsr_lo = $0f ; 0
vdcr_lp_y = $10 ; -- y position of light pen (lines, plus 1)
vdcr_lp_x = $11 ; -- x position if light pen (characters, plus 8)
vdcr_ram_hi = $12 ; -- RAM address of register $1f
vdcr_ram_lo = $13 ; --
vdcr_attr_hi = $14 ; $08 RAM address of attribute buffer
vdcr_attr_lo = $15 ; $00
vdcr_charwidth = $16 ; $78 4b total minus one, 4b displayed minus one
vdcr_charheight_disp = $17 ; 8 5b displayed, minus one
vdcr_control_v = $18 ; $20 vertical scroll and much other stuff
vdcr_CONTROLV_BLOCKMODE_MASK = %#.......
; vdcr_CONTROLV_BLOCKMODE_WRITE = %........
vdcr_CONTROLV_BLOCKMODE_COPY = %#.......
vdcr_CONTROLV_REVERSESCREEN = %.#......
vdcr_CONTROLV_FLASHFREQ_MASK = %..#.....
; vdcr_CONTROLV_FLASHFREQ_FAST = %........
vdcr_CONTROLV_FLASHFREQ_SLOW = %..#.....
vdcr_CONTROLV_UPSCROLL_MASK = %...#####
vdcr_control_h = $19 ; $47 ($40 for vdc version 0) horizontal scroll and much other stuff
vdcr_CONTROLH_MODE_MASK = %#.......
; vdcr_CONTROLH_MODE_TEXT = %........
vdcr_CONTROLH_MODE_BITMAP = %#.......
vdcr_CONTROLH_ATTRIBUTES_MASK = %.#......
; vdcr_CONTROLH_ATTRIBUTES_OFF = %........
vdcr_CONTROLH_ATTRIBUTES_ON = %.#......
vdcr_CONTROLH_SEMIGRAPHICS = %..#.....
vdcr_CONTROLH_PIXELWIDTH_MASK = %...#....
; vdcr_CONTROLH_PIXELWIDTH_NARROW = %........
vdcr_CONTROLH_PIXELWIDTH_WIDE = %...#....
vdcr_CONTROLH_LEFTSCROLL_MASK = %....####
vdcr_color = $1a ; $f0 4b foreground, 4b background
vdcr_COLOR_FOREGROUND_MASK = %####.... ; only used if attributes are off
vdcr_COLOR_BACKGROUND_MASK = %....####
vdcr_row_inc = $1b ; 0 address increment per row
vdcr_charset = $1c ; $20 3b charset pointer, 1b RAM type, 4b unused
vdcr_CHARSET_ADRESS_MASK = %###.....
vdcr_CHARSET_RAMTYPE_MASK = %...#....
; vdcr_CHARSET_RAMTYPE_16K = %........
vdcr_CHARSET_RAMTYPE_64K = %...#....
vdcr_underline = $1d ; 7 5b scanline
vdcr_cycles = $1e ; -- number of write- or copy-cycles. 0 means 256.
vdcr_access = $1f ; -- RAM content of address r$12/13
vdcr_source_hi = $20 ; -- RAM address of cycle start
vdcr_source_lo = $21 ; --
vdcr_enable_start = $22 ; 125 column to enable display in
vdcr_enable_end = $23 ; 100 column to disable display in
vdcr_dram_refresh = $24 ; 5 RAM refresh rate (lower 4 bits)
vdcr_sync_polarity = $25 ; -- only in VDC 8568
vdcr_HSYNC_POLARITY = %#.......
vdcr_VSYNC_POLARITY = %.#......
!address {
; the c128 ROMs contain look-up tables to convert vic color values to vdc color
; values and vice-versa:
; rom4_* needs "low rom area" enabled ($4000..$7fff)
; rom8_* needs "middle rom area" enabled ($8000..$bfff)
; romc_* needs "high rom area" enabled ($c000..$ffff)
rom4_vic_to_vdc_color_table = $6a4c ; 00 0f 08 07 0b 04 02 0d 0a 0c 09 06 01 05 03 0e
rom8_vdc_to_vic_color_table = $81f3 ; 00 0c 06 0e 05 0d 0b 03 02 0a 08 04 09 07 0f 01
romc_vic_to_vdc_color_table = $ce5c ; 00 0f 08 07 0b 04 02 0d 0a 0c 09 06 01 05 03 0e
}
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