+// BLITTER REGISTERS
+// ------------------------------------------------------------
+// F02200-F022FF R/W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx Blitter registers
+// F02200 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A1_BASE - A1 base register
+// F02204 W -------- ---xxxxx -xxxxxxx xxxxx-xx A1_FLAGS - A1 flags register
+// W -------- ---x---- -------- -------- (YSIGNSUB - invert sign of Y delta)
+// W -------- ----x--- -------- -------- (XSIGNSUB - invert sign of X delta)
+// W -------- -----x-- -------- -------- (Y add control)
+// W -------- ------xx -------- -------- (X add control)
+// W -------- -------- -xxxxxx- -------- (width in 6-bit floating point)
+// W -------- -------- -------x xx------ (ZOFFS1-6 - Z data offset)
+// W -------- -------- -------- --xxx--- (PIXEL - pixel size)
+// W -------- -------- -------- ------xx (PITCH1-4 - data phrase pitch)
+// F02208 W -xxxxxxx xxxxxxxx -xxxxxxx xxxxxxxx A1_CLIP - A1 clipping size
+// W -xxxxxxx xxxxxxxx -------- -------- (height)
+// W -------- -------- -xxxxxxx xxxxxxxx (width)
+// F0220C R/W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A1_PIXEL - A1 pixel pointer
+// R/W xxxxxxxx xxxxxxxx -------- -------- (Y pixel value)
+// R/W -------- -------- xxxxxxxx xxxxxxxx (X pixel value)
+// F02210 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A1_STEP - A1 step value
+// W xxxxxxxx xxxxxxxx -------- -------- (Y step value)
+// W -------- -------- xxxxxxxx xxxxxxxx (X step value)
+// F02214 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A1_FSTEP - A1 step fraction value
+// W xxxxxxxx xxxxxxxx -------- -------- (Y step fraction value)
+// W -------- -------- xxxxxxxx xxxxxxxx (X step fraction value)
+// F02218 R/W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A1_FPIXEL - A1 pixel pointer fraction
+// R/W xxxxxxxx xxxxxxxx -------- -------- (Y pixel fraction value)
+// R/W -------- -------- xxxxxxxx xxxxxxxx (X pixel fraction value)
+// F0221C W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A1_INC - A1 increment
+// W xxxxxxxx xxxxxxxx -------- -------- (Y increment)
+// W -------- -------- xxxxxxxx xxxxxxxx (X increment)
+// F02220 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A1_FINC - A1 increment fraction
+// W xxxxxxxx xxxxxxxx -------- -------- (Y increment fraction)
+// W -------- -------- xxxxxxxx xxxxxxxx (X increment fraction)
+// F02224 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A2_BASE - A2 base register
+// F02228 W -------- ---xxxxx -xxxxxxx xxxxx-xx A2_FLAGS - A2 flags register
+// W -------- ---x---- -------- -------- (YSIGNSUB - invert sign of Y delta)
+// W -------- ----x--- -------- -------- (XSIGNSUB - invert sign of X delta)
+// W -------- -----x-- -------- -------- (Y add control)
+// W -------- ------xx -------- -------- (X add control)
+// W -------- -------- -xxxxxx- -------- (width in 6-bit floating point)
+// W -------- -------- -------x xx------ (ZOFFS1-6 - Z data offset)
+// W -------- -------- -------- --xxx--- (PIXEL - pixel size)
+// W -------- -------- -------- ------xx (PITCH1-4 - data phrase pitch)
+// F0222C W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A2_MASK - A2 window mask
+// F02230 R/W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A2_PIXEL - A2 pixel pointer
+// R/W xxxxxxxx xxxxxxxx -------- -------- (Y pixel value)
+// R/W -------- -------- xxxxxxxx xxxxxxxx (X pixel value)
+// F02234 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx A2_STEP - A2 step value
+// W xxxxxxxx xxxxxxxx -------- -------- (Y step value)
+// W -------- -------- xxxxxxxx xxxxxxxx (X step value)
+// F02238 W -xxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_CMD - command register
+// W -x------ -------- -------- -------- (SRCSHADE - modify source intensity)
+// W --x----- -------- -------- -------- (BUSHI - hi priority bus)
+// W ---x---- -------- -------- -------- (BKGWREN - writeback destination)
+// W ----x--- -------- -------- -------- (DCOMPEN - write inhibit from data comparator)
+// W -----x-- -------- -------- -------- (BCOMPEN - write inhibit from bit coparator)
+// W ------x- -------- -------- -------- (CMPDST - compare dest instead of src)
+// W -------x xxx----- -------- -------- (logical operation)
+// W -------- ---xxx-- -------- -------- (ZMODE - Z comparator mode)
+// W -------- ------x- -------- -------- (ADDDSEL - select sum of src & dst)
+// W -------- -------x -------- -------- (PATDSEL - select pattern data)
+// W -------- -------- x------- -------- (TOPNEN - enable carry into top intensity nibble)
+// W -------- -------- -x------ -------- (TOPBEN - enable carry into top intensity byte)
+// W -------- -------- --x----- -------- (ZBUFF - enable Z updates in inner loop)
+// W -------- -------- ---x---- -------- (GOURD - enable gouraud shading in inner loop)
+// W -------- -------- ----x--- -------- (DSTA2 - reverses A2/A1 roles)
+// W -------- -------- -----x-- -------- (UPDA2 - add A2 step to A2 in outer loop)
+// W -------- -------- ------x- -------- (UPDA1 - add A1 step to A1 in outer loop)
+// W -------- -------- -------x -------- (UPDA1F - add A1 fraction step to A1 in outer loop)
+// W -------- -------- -------- x------- (diagnostic use)
+// W -------- -------- -------- -x------ (CLIP_A1 - clip A1 to window)
+// W -------- -------- -------- --x----- (DSTWRZ - enable dest Z write in inner loop)
+// W -------- -------- -------- ---x---- (DSTENZ - enable dest Z read in inner loop)
+// W -------- -------- -------- ----x--- (DSTEN - enables dest data read in inner loop)
+// W -------- -------- -------- -----x-- (SRCENX - enable extra src read at start of inner)
+// W -------- -------- -------- ------x- (SRCENZ - enables source Z read in inner loop)
+// W -------- -------- -------- -------x (SRCEN - enables source data read in inner loop)
+// F02238 R xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_CMD - status register
+// R xxxxxxxx xxxxxxxx -------- -------- (inner count)
+// R -------- -------- xxxxxxxx xxxxxx-- (diagnostics)
+// R -------- -------- -------- ------x- (STOPPED - when stopped in collision detect)
+// R -------- -------- -------- -------x (IDLE - when idle)
+// F0223C W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_COUNT - counters register
+// W xxxxxxxx xxxxxxxx -------- -------- (outer loop count)
+// W -------- -------- xxxxxxxx xxxxxxxx (inner loop count)
+// F02240-F02247 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_SRCD - source data register
+// F02248-F0224F W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_DSTD - destination data register
+// F02250-F02257 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_DSTZ - destination Z register
+// F02258-F0225F W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_SRCZ1 - source Z register 1
+// F02260-F02267 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_SRCZ2 - source Z register 2
+// F02268-F0226F W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_PATD - pattern data register
+// F02270 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_IINC - intensity increment
+// F02274 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_ZINC - Z increment
+// F02278 W -------- -------- -------- -----xxx B_STOP - collision control
+// W -------- -------- -------- -----x-- (STOPEN - enable blitter collision stops)
+// W -------- -------- -------- ------x- (ABORT - abort after stop)
+// W -------- -------- -------- -------x (RESUME - resume after stop)
+// F0227C W -------- xxxxxxxx xxxxxxxx xxxxxxxx B_I3 - intensity 3
+// F02280 W -------- xxxxxxxx xxxxxxxx xxxxxxxx B_I2 - intensity 2
+// F02284 W -------- xxxxxxxx xxxxxxxx xxxxxxxx B_I1 - intensity 1
+// F02288 W -------- xxxxxxxx xxxxxxxx xxxxxxxx B_I0 - intensity 0
+// F0228C W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_Z3 - Z3
+// F02290 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_Z2 - Z2
+// F02294 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_Z1 - Z1
+// F02298 W xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx B_Z0 - Z0
+// ------------------------------------------------------------