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tms9918_cvbs.spin2
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{
TMS9918 Emulation
Original PAL / NTSC Video Driver by Chip Gracey
Tweakes and VDP Emulation by Marco Maccaferri <[email protected]>
}
CON
x_pixels = 256
y_pixels = 192
x_tweak = 0
y_tweak = 0
VAR
long status
PUB start(pal, tms_regs, tms_vram, bitmap, pin) | x_total, dotf, dotps, i
x_total := pal ? 416 : 378
dotf := muldiv64(x_total, pal ? pal_cf * 4 * 128 : ntsc_cf * 4 * 128, pal ? pal_cc : ntsc_cc) 'compute pixel clock * 128
dotps := muldiv64(1_000_000, 128_000_000, dotf) 'compute ps per pixel clock
debug(udec(dotf,dotps))
_md := pal << 2 '| interlaced << 1 'set modal data
_cb := pal ? pal_cb : ntsc_cb
_cy := pal ? pal_cy : ntsc_cy
_ci := pal ? pal_ci : ntsc_ci
_cq := pal ? pal_cq : ntsc_cq
_ca := pal ? pal_ca : ntsc_cq
_cf := (pal ? pal_cf : ntsc_cf) frac clkfreq
i := 31 - encod clkfreq 'compute very accurate streamer frequency to stop dot-crawl
_xf := ((dotf >> (7-i)) frac (clkfreq << i) + 1) >> 1
debug(udec(i),ubin_long(clkfreq))
_bs := (pal ? pal_bs : ntsc_bs) 'compute horizontal sync timing
_ds := (pal ? pal_ds : ntsc_ds) + _bs
_bc := (pal ? pal_bc : ntsc_bc) + _ds
_dc := (pal ? pal_dc : ntsc_dc) + _bc
_ac := (pal ? pal_ac : ntsc_ac) + _dc
_bs := (_bs << 1 / dotps + 1) >> 1
_ds := (_ds << 1 / dotps + 1) >> 1 - _bs
_bc := (_bc << 1 / dotps + 1) >> 1 - _bs - _ds
_dc := (_dc << 1 / dotps + 1) >> 1 - _bs - _ds - _bc
_ac := (_ac << 1 / dotps + 1) >> 1 - _bs - _ds - _bc - _dc
i := _bs + _ds + _bc + _dc + _ac 'compute visible timing
_bv := (x_total - x_pixels - i) / 2 + x_tweak
_dv := x_pixels
_av := x_total - x_pixels - i - _bv
_db := _bv + _dv + _av
debug(udec(_bv, _dv, _av, i))
_hf := x_total / 2 'compute vertical sync timing
_hl := ((pal ? pal_hl : ntsc_hl) << 1 / dotps + 1) >> 1
_hh := _hf - _hl - _bs
_ll := ((pal ? pal_ll : ntsc_ll) << 1 / dotps + 1) >> 1
_lh := _hf - _ll - _bs
_vs := pal ? pal_vs : ntsc_vs
repeat i from @_bs to @_lh step 4 'turn bs..lh into streamer commands
long[i] |= i == @_dv ? $7F08_0000 : $7F01_0000
_bv := (_bv & $FFFF) | $3F00_0000 'overrides
_av := (_av & $FFFF) | $3F00_0000
_bb := (_db & $FFFF) | $3F00_0000
i := pal ? pal_dl : ntsc_dl 'compute vertical lines
_bl := (i - y_pixels) / 2 + y_tweak
_al := i - y_pixels - _bl
_bl += pal ? 18 : 10 '+10 for ntsc
debug(udec(_bl, y_pixels, _al, i))
_pn := pin
_tms_status := @status
_tms_regs := tms_regs
_tms_vram := tms_vram
_tms_first := _bl
_tms_last := _tms_first + 192
_tms_bitmap := bitmap
_tms_palette := @tms_palette
coginit(16, @driver, 0)
PUB get_status() : rc
if (rc := status) <> 0
status := 0
DAT orgh
tms_palette long $00_00_00_00
long $00_00_00_00
long $66_CC_66_00
long $88_EE_88_00
long $44_44_DD_00
long $77_77_FF_00
long $BB_55_55_00
long $77_DD_DD_00
long $DD_66_66_00
long $FF_77_77_00
long $CC_CC_55_00
long $EE_EE_88_00
long $55_AA_55_00
long $BB_55_BB_00
long $CC_CC_CC_00
long $EE_EE_EE_00
DAT org
'
' Driver
'
driver
setq2 #$10 - 1 'load palette into lut
rdlong 0,_tms_palette
setcmod #%11_1_0000 'set colorspace converter to YIQ mode (composite)
setcy _cy 'set colorspace converter y coefficients
setci _ci 'set colorspace converter i coefficients
setcfrq _cf 'set colorspace converter frequency
setxfrq _xf 'set transfer frequency
cogid cx 'install cogid into dacmode
setnib dacmode,cx,#2
wrpin dacmode,_pn 'enable dac mode in pin(s)
drvl _pn 'enable dac output(s)
mov ijmp1,#field 'set up streamer-empty interrupt
setint1 #10
mov scol, #0
xcont #10,#0 'do streamer instruction to start interrupt sequence
'
'
' Main program
'
loop
cmp _cl, scnt wcz
if_z jmp #loop
mov scol, scol+1
mov scnt, _cl
setq #1 ' read registers into temp buffer
rdlong sbuf, _tms_regs ' |
getnib scol+1, sbuf+1, #6 ' border color for next line
movbyts scol+1, #0
cmp _cl, _tms_first wcz ' check if first visible line
if_c jmp #loop
cmp _cl, _tms_last wc ' check if last visible line
if_nc jmp #loop
if_z mov loff, #0 ' if first line reset counters...
if_z mov lcnt, #0
if_z mov ptrv, _tms_bitmap ' ...and pointers
getbyte regs+0, sbuf, #0
test regs+0, #TMSMODE3 wz ' graphics mode II
getbyte regs+1, sbuf, #1
getbyte regs+2, sbuf, #2
shl regs+2, #10 ' name table base address * $400
add regs+2, _tms_vram
getbyte regs+3, sbuf, #3
shl regs+3, #6 ' color table base address * $40
if_nz andn regs+3, vdp_8k_mask ' limit color table to 8k boundaries
add regs+3, _tms_vram
getbyte regs+4, sbuf+1, #0
shl regs+4, #11 ' pattern generator base address * $800
if_nz andn regs+4, vdp_8k_mask ' limit pattern table to 8k boundaries
add regs+4, _tms_vram
getbyte regs+5, sbuf+1, #1
shl regs+5, #7 ' sprite attribute table base address * $80
add regs+5, _tms_vram
getbyte regs+6, sbuf+1, #2
shl regs+6, #11 ' sprite pattern generator base address * $800
add regs+6, _tms_vram
getbyte regs+7, sbuf+1, #3
setq #32-1 ' read all sprite attribute table
rdlong sbuf, regs+5
scanline
mov ptra, ptrv
test regs+1, #TMSBLANK wz ' blank
if_z jmp #blank_line
test regs+1, #TMSMODE1 wz ' text mode
mov a, lcnt
andn a, #$07 ' divide and multiply by 8
mov b, a
shl a, #2 ' multiply by 32
if_nz add a, b ' multiply by 40
add regs+2, a
test regs+1, #TMSMODE2 wz ' multicolor mode
if_nz jmp #multicolor_mode
test regs+1, #TMSMODE1 wz ' text mode
if_z jmp #graphics_mode
text_mode
getnib ctmp, regs+7, #1 ' foreground color
shl ctmp, #8
setnib ctmp, regs+7, #0 ' background color
mov cbuf+0, ctmp
movbyts cbuf+0, #0
setq #1
wrlong cbuf+0, ptra++
mov ptrb, regs+2
mov ecnt, #40
.loop rdbyte ptrc, ptrb++ ' read tile number to display
shl ptrc, #3 ' 8 bytes per tile
add ptrc, regs+4
add ptrc, loff
rdbyte a, ptrc ' pixels, 1 bit per pixel, from msb
rev a
shr a, #24
mergew a
mov cbuf+0, ctmp
movbyts cbuf+0, a
shr a, #8
mov cbuf+1, ctmp
movbyts cbuf+1, a
setq #1
wrlong cbuf+0, ptra++
sub ptra, #2
djnz ecnt, #.loop
mov cbuf+0, ctmp
movbyts cbuf+0, #0
setq #1
wrlong cbuf+0, ptra++
jmp #end_scanline
blank_line
getnib ctmp, regs+7, #0 ' background color
movbyts ctmp, #0
mov ecnt, #256/4 ' fill line with background
.l1 wrlong ctmp, ptra++
djnz ecnt, #.l1
jmp #end_scanline
multicolor_mode
mov a, lcnt
shr a, #2
and a, #$07
mov ptrb, regs+2
mov ecnt, #32
.loop rdbyte ptrc, ptrb++ ' read tile number to display
shl ptrc, #3
add ptrc, regs+4 ' points to color table
add ptrc, a
rdbyte cbuf+0, ptrc ' colors
mov cbuf+1, cbuf+0
and cbuf+1, #$0F wz
if_z setnib cbuf+1, regs+7, #0
shr cbuf+0, #4 wz
if_z setnib cbuf+0, regs+7, #0
movbyts cbuf+0, #%%0000
movbyts cbuf+1, #%%0000
setq #1
wrlong cbuf+0, ptra++
djnz ecnt, #.loop
jmp #sprites
graphics_mode
test regs+0, #TMSMODE3 wz ' graphics mode II
if_nz mov a, lcnt
if_nz shr a, #6 ' divide by 64 (8 rows by 8 pixels)
if_nz shl a, #11 ' multiply by 2048
mov b, loff ' offset into pattern table
if_nz add b, a ' add mode II pattern table offset
bitnz .shlr, #21 ' patch shl(0)/shr(1)
mov ptrb, regs+2
mov ecnt, #32
.loop rdbyte ptrc, ptrb++ ' read tile number to display
mov ptrd, ptrc
.shlr shl ptrd, #3
add ptrd, regs+3 ' points to color table
test regs+0, #TMSMODE3 wz ' graphics mode II
if_nz add ptrd, b
rdbyte a, ptrd ' colors
getnib cbuf+0, a, #0
and cbuf+0, #$0F wz
if_z setnib cbuf+0, regs+7, #0
getnib cbuf+1, a, #1
and cbuf+1, #$0F wz
if_z setnib cbuf+1, regs+7, #0
setbyte cbuf+0, cbuf+1, #1
mov cbuf+1, cbuf+0
shl ptrc, #3 ' 8 bytes per tile
add ptrc, regs+4
add ptrc, b
rdbyte a, ptrc ' pixels, 1 bit per pixel, from msb
rev a
shr a, #24
mergew a
movbyts cbuf+0, a
shr a, #8
movbyts cbuf+1, a
setq #1
wrlong cbuf+0, ptra++
djnz ecnt, #.loop
' fall through
sprites
mov b, #8
test regs+1, #TMSSPRSIZE wz
if_nz shl b, #1
test regs+1, #TMSSPRMAG wz
if_nz shl b, #1
mov ecnt, #14 ' clear buffers
.l1 altd ecnt, #vbuf-1
mov 0-0, #0
djnz ecnt, #.l1
mov stat, #0
mov vcnt, #0
mov ccnt, #0
.loop alts ccnt, #sbuf
mov sprt, 0-0
mov y, sprt
shl y, #24
sar y, #24 ' sign-extend y
cmps y, neg_clip wc
if_c and y, #$FF ' max -32
cmp y, #$D0 wz ' end of sprites processing
if_z jmp #.end
mov a, lcnt ' check sprite scanline visibility
subs a, y wc
if_c jmp #.next
cmp a, b wc
if_nc jmp #.next
setbyte sprt, a, #0
incmod vcnt, #4 wc ' limit sprites on scanline
if_c mov stat, ccnt ' set 5th sprite
if_c or stat, #%010_00000
if_c jmp #.end
altd vcnt, #vbuf-1
mov 0-0, sprt
.next incmod ccnt, #TMSSPRITES-1 wc
if_nc jmp #.loop
.end
mov sprt, vbuf+3 wz
if_nz calld draw_sprite_ret, #draw_sprite
mov sprt, vbuf+2 wz
if_nz calld draw_sprite_ret, #draw_sprite
mov sprt, vbuf+1 wz
if_nz calld draw_sprite_ret, #draw_sprite
mov sprt, vbuf+0 wz
if_nz calld draw_sprite_ret, #draw_sprite
rdbyte a, _tms_status ' update status byte
test stat, #%001_00000 wz
if_nz or a, #%001_00000
test a, #%010_00000 wz
if_z or a, stat
wrbyte a, _tms_status
end_scanline
add ptrv, #256
incmod loff, #7
incmod lcnt, #192-1
jmp #loop
draw_sprite
getbyte a, sprt, #0
mov ptrc, sprt
shr ptrc, #16
and ptrc, #$FF
shl ptrc, #3
add ptrc, regs+6
test regs+1, #TMSSPRMAG wz
if_nz shr a, #1
add ptrc, a
getnib ctmp, sprt, #6 'set sprite color
shl ctmp, #8
getbyte x, sprt, #1
testbn sprt, #31 wz 'TMSEARLYCLK
if_nz sub x, #32
mov ptra, ptrv
add ptra, x
test regs+1, #TMSSPRSIZE wz
if_z mov ecnt, #4
if_nz mov ecnt, #8
rdbyte sprt, ptrc
shl sprt, #8
if_nz add ptrc, #16
if_nz rdbyte a, ptrc
if_nz or sprt, a
test regs+1, #TMSSPRMAG wz
if_nz setword sprt, sprt, #1
if_nz mergew sprt
if_z shl sprt, #16
cmps x, #0 wc ' skip left offscreen pixels
if_c abs x ' |
if_c add ptra, x ' |
if_c sub ecnt, x ' |
if_c cmps x, #32 wz ' |
if_c_and_z mov sprt, #0 ' |
if_c_and_nz shl sprt, x ' |
if_c mov x, #0 ' |
mov cbuf, sprt
mov cbuf+1, cbuf
mov y, x ' check sprite collision
sar y, #5 ' |
add y, #line ' |
setd .c0, y ' |
setd .c0+1, y ' |
add y, #1 ' |
setd .c1, y ' |
setd .c1+1, y ' |
mov a, x ' |
and a, #$1F wz ' |
if_z mov cbuf+1, #0 ' |
shr cbuf, a ' |
.c0 test 0-0, cbuf wz ' |
or 0-0, cbuf ' |
mov y, #32 ' |
sub y, a ' |
shl cbuf+1,y ' |
.c1 if_z test 0-0, cbuf+1 wz ' |
or 0-0, cbuf+1 ' |
if_nz or stat, #%0010_0000 ' update collision flag
mov line+8, #0 ' clear right offscreen pixels
rev sprt
.draw getnib a, sprt, #0
mergew a
mov cbuf+0, ctmp
movbyts cbuf+0, a
wmlong cbuf+0, ptra++
add x, #4
cmp x, #256 wc
shr sprt, #4 wz
if_c_and_nz djnz ecnt, #.draw
jmp draw_sprite_ret
draw_sprite_ret long 0
'
'
' Field loop
'
' _md 00x NTSC non-interlaced: 7H, 6L, 6H, half, B(10), F0(243)
' 010 NTSC interlaced field0: 6H, 6L, 6H, B(10), F0(243)
' 011 NTSC interlaced field1: 7H, 6L, 6H, half, B(10), F1(243)
' 10x PAL non-interlaced: 6H, 5L, 5H, half, B(16), F0(288)
' 110 PAL interlaced field0: 5H, 5L, 5H, half, B(16), F0(288)
' 111 PAL interlaced field1: 6H, 5L, 5H, B(17), F1(288)
'
field
mov cx,_bl 'before-visible blank lines (already +10 for ntsc)
calld blank_ret, #blank
mov cx, #0 'visible lines
rdfast #0, _tms_bitmap 'start reading pixels into fifo
.line xcont _bs, #1 'horizontal sync
add _cl, #1
resi1
xcont _ds, #2
resi1
xcont _bc, #1
resi1
xcont _dc, _cb
bitnot _md, #31 wcz 'for pal, alternate phase each line
if_nc setcq _cq
if_c setcq _ca
resi1
xcont _ac, #1
resi1
xcont _bv, scol 'before-visible spacer
resi1
xcont _dv, #0 'visible line
resi1
xcont _av, scol 'after-visible spacer
resi1
incmod cx, #y_pixels-1 wc 'another line?
if_nc jmp #.line
rdbyte cy, _tms_status ' update status byte
or cy, #%100_00000 ' vsync flag
wrbyte cy, _tms_status
cogatn #%00000001 'signal vertical sync to cog0
mov cx, _al wz 'after-visible blank lines
calld blank_ret, #blank
test _md, #%010 wc 'toggle field?
if_c xor _md, #%001
decod cy,_md 'initial high vertical syncs
test cy,#%1000_1001 wc 'if ntsc/non-interlaced or field1, add 1
addx cx,_vs
vhigh xcont _bs,#1
resi1
xcont _hl,#2
resi1
xcont _hh,#1
resi1
djnz cx,#vhigh
mov cx,_vs 'low vertical syncs
vlow xcont _bs,#1
resi1
xcont _ll,#2
resi1
xcont _lh,#1
resi1
djnz cx,#vlow
mov _cl, #0
mov cx,_vs 'final high vertical syncs
vhigh2 xcont _bs,#1
resi1
xcont _hl,#2
resi1
xcont _hh,#1
resi1
djnz cx,#vhigh2
test cy,#%0101_1001 wc 'if ntsc/non-interlaced/field0 or ntsc/interlaced/field1 or pal/field0, do half line
if_c xcont _hf,#1
jmp #field 'loop
'
'
'
'
blank xcont _bs, #1 'horizontal sync
add _cl, #1
resi1
xcont _ds, #2
resi1
xcont _bc, #1
resi1
xcont _dc, _cb
bitnot _md, #31 wcz 'for pal, alternate phase each line
if_nc setcq _cq
if_c setcq _ca
resi1
xcont _ac, #1
resi1
cmp _cl, #16 wcz
if_c xcont _db, #1
if_nc xcont _bb, scol
resi1
djnz cx, #blank
jmp blank_ret
blank_ret long 0
'
'
' Data
'
dacmode long p_dac_75r_2v+p_channel '%0000_0000_000_101110000xxxx_01_00000_0
cx long 0
cy long 0
_md long 0 'mode (bits 2/1/0 : pal/interlace/field)
_cb long 0 'colorburst reference color
_cy long 0 'colorspace y coefficients
_ci long 0 'colorspace i coefficients
_cq long 0 'colorspace q coefficients
_ca long 0 'colorspace q coefficients, alt for pal
_cf long 0 'colorspace frequency setting
_xf long 0 'streamer frequency setting
_bs long 0 'streamer command: before-sync
_ds long 0 'streamer command: during-sync
_bc long 0 'streamer command: before-colorburst
_dc long 0 'streamer command: during-colorburst
_ac long 0 'streamer command: after-colorburst
_bv long 0 'streamer command: before-visible
_dv long 0 'streamer command: during-visible
_av long 0 'streamer command: after-visible
_db long 0 'streamer command: during-blank
_bb long 0 'streamer command: during-border
_hf long 0 'streamer command: half-line
_hl long 0 'streamer command: high-vsync-low
_hh long 0 'streamer command: high-vsync-high
_ll long 0 'streamer command: low-vsync-low
_lh long 0 'streamer command: low-vsync-high
_vs long 0 'vertical sync pulses
_ml long 0 'mandatory blank lines
_rl long 0 'retrace lines
_bl long 0 'before-visible lines
_al long 0 'after-visible lines
_cl long 0 'current line
_pn long 0 'pin(s)
_tms_status long 0
_tms_regs long 0
_tms_vram long 0
_tms_first long 0
_tms_last long 0
_tms_bitmap long 0
_tms_palette long 0
vdp_8k_mask long $1FFF
neg_clip long -32
TMSSPRCOLOR long %00001111_00000000_00000000_00000000
a res 1
b res 1
x res 1
y res 1
scnt res 1
scol res 2 'backdrop/border color
lcnt res 1
loff res 1
ccnt res 1
vcnt res 1
ecnt res 1
ctmp res 1
cbuf res 2
sprt res 1
ptrc res 1
ptrd res 1
ptrv res 1
stat res 1
regs res 8
sbuf res 32
vbuf res 4
res 1
line res 8
fit $1F0
CON
TMSMODE3 = %00000010 ' mode bit 3
TMSEXTVID = %00000001 ' external video
' register 1 control bits
TMS4K16K = %10000000 ' 4/16K RAM
TMSBLANK = %01000000 ' screen blank
TMSINTEN = %00100000 ' interrupt enable
TMSMODE1 = %00010000 ' mode bit 1
TMSMODE2 = %00001000 ' mode bit 2
TMSSPRSIZE = %00000010 ' sprite size
TMSSPRMAG = %00000001 ' sprite magnification
TMSVSYNC = %10000000 ' framce sync
TMSSPRITES = 32
CON
'============================================================================================= NTSC metrics
ntsc_blank_lev = 40.0 'levels
ntsc_black_lev = ntsc_blank_lev + 7.5
ntsc_peak_lev = ntsc_blank_lev + 140.0
ntsc_scale = 127.0 / ntsc_peak_lev * 128.0
ntsc_scale_cor = ntsc_scale / 1.646 'CORDIC prescale for IQ modulator
ntsc_blank = round(ntsc_scale * 2.0 * ntsc_blank_lev / ntsc_peak_lev)
ntsc_black = round(ntsc_scale * 2.0 * ntsc_black_lev / ntsc_peak_lev)
ntsc_yr = round(ntsc_scale * 0.299) 'Y sums to 1
ntsc_yg = round(ntsc_scale * 0.587)
ntsc_yb = round(ntsc_scale * 0.114)
ntsc_ir = round(ntsc_scale_cor * 0.596) 'I sums to 0
ntsc_ig = round(ntsc_scale_cor * -0.274)
ntsc_ib = round(ntsc_scale_cor * -0.322)
ntsc_qr = round(ntsc_scale_cor * 0.212) 'Q sums to 0
ntsc_qg = round(ntsc_scale_cor * -0.523)
ntsc_qb = round(ntsc_scale_cor * 0.311)
ntsc_cy = (ntsc_yr & $FF) << 24 + (ntsc_yg & $FF) << 16 + (ntsc_yb & $FF) << 8 + ntsc_black
ntsc_ci = (ntsc_ir & $FF) << 24 + (ntsc_ig & $FF) << 16 + (ntsc_ib & $FF) << 8 + ntsc_blank
ntsc_cq = (ntsc_qr & $FF) << 24 + (ntsc_qg & $FF) << 16 + (ntsc_qb & $FF) << 8 + 128
ntsc_cb = $809000_01 'colorburst reference color
ntsc_cf = 3_579_545 'colorburst frequency
ntsc_cc = round(227.5 * 4.0) 'color cycles per line * 4 to preserve fraction
ntsc_bs = 1_600_000 'ps before sync
ntsc_ds = 4_700_000 'ps during sync
ntsc_bc = 600_000 'ps before colorburst
ntsc_dc = 2_500_000 'ps during colorburst
ntsc_ac = 1_500_000 'ps after colorburst
ntsc_hl = 2_300_000 'ps during high vsync
ntsc_ll = 27_100_000 'ps during low vsync
ntsc_vs = 6 'vsync pulses
ntsc_dl = 243 'display lines
'============================================================================================= PAL metrics
pal_blank_lev = 43.0 'levels
pal_black_lev = pal_blank_lev + 0.0
pal_peak_lev = pal_blank_lev + 140.0
pal_scale = 127.0 / pal_peak_lev * 128.0
pal_scale_cor = pal_scale / 1.646 'CORDIC prescale for IQ modulator
pal_blank = round(pal_scale * 2.0 * pal_blank_lev / pal_peak_lev)
pal_black = round(pal_scale * 2.0 * pal_black_lev / pal_peak_lev)
pal_yr = round(pal_scale * 0.299) 'Y sums to 1
pal_yg = round(pal_scale * 0.587)
pal_yb = round(pal_scale * 0.114)
pal_ur = round(pal_scale_cor * -0.147) 'I sums to 0
pal_ug = round(pal_scale_cor * -0.289)
pal_ub = round(pal_scale_cor * 0.436)
pal_vr = round(pal_scale_cor * 0.615) 'Q sums to 0
pal_vg = round(pal_scale_cor * -0.515)
pal_vb = round(pal_scale_cor * -0.100)
pal_cy = ( pal_yr & $FF) << 24 + ( pal_yg & $FF) << 16 + ( pal_yb & $FF) << 8 + pal_black
pal_ci = ( pal_ur & $FF) << 24 + ( pal_ug & $FF) << 16 + ( pal_ub & $FF) << 8 + pal_blank
pal_cq = ( pal_vr & $FF) << 24 + ( pal_vg & $FF) << 16 + ( pal_vb & $FF) << 8 + 128
pal_ca = (-pal_vr & $FF) << 24 + (-pal_vg & $FF) << 16 + (-pal_vb & $FF) << 8 + 128
pal_cb = $FFC060_01 'colorburst reference color
pal_cf = 4_433_618 'colorburst frequency
pal_cc = round(283.75 * 4.0) 'color cycles per line * 4 to preserve fraction
pal_bs = 1_500_000 'ps before sync
pal_ds = 4_700_000 'ps during sync
pal_bc = 900_000 'ps before colorburst
pal_dc = 2_300_000 'ps during colorburst
pal_ac = 2_600_000 'ps after colorburst
pal_hl = 2_350_000 'ps during high vsync
pal_ll = 27_300_000 'ps during low vsync
pal_vs = 5 'vsync pulses
pal_dl = 288 'display lines