initial import, completely untested, does not compile yet

libsrc/pcengine/pcengine.inc

@@ -0,0 +1,75 @@
+
+			.include "huc6280.inc"
+
+; Write VDC register
+                  .macro VREG arg1,arg2
+                        st0     #arg1
+                        st1     #<(arg2)
+                        st2     #>(arg2)
+                  .endmacro
+
+_tickcount= $20
+
+screenrows = (224/8)
+charsperline = (512/8)
+xsize = charsperline
+
+CH_HLINE = 7
+CH_VLINE = 7
+
+CURS_X	= $30
+CURS_Y	= $31
+SCREEN_PTR = $32
+CRAM_PTR = $34
+CHARCOLOR = $36
+RVS = $37   
+BGCOLOR=$38
+
+; huc6270 - Video Display Controller (vdc)
+
+VDC_MAWR = 0 ; Memory Address Write Register
+VDC_MARR = 1 ; Memory Address Read Register
+VDC_VWR  = 2 ; VRAM Write Register
+VDC_VRR  = 3 ; VRAM Read Register
+VDC_CR   = 4 ; Control Register
+VDC_RCR  = 5 ; Raster Counter Register
+VDC_BXR  = 6 ; Background X-Scroll Register
+VDC_BYR  = 7 ; Background Y-Scroll Register
+VDC_MWR  = 8 ; Memory-access Width Register
+VDC_HSR  = 9 ; Horizontal Sync Register (?)
+VDC_HDR  =10 ; Horizontal Display Register (?)
+VDC_VPR  =11 ; (unknown)
+VDC_VDW  =12 ; (unknown use)
+VDC_VCR  =13 ; (unknown use)
+VDC_DCR  =14 ; (DMA) Control Register
+VDC_SOUR =15 ; (DMA) Source Register
+VDC_DESR =16 ; (DMA) Destination Register
+VDC_LENR =17 ; (DMA) Length Register
+VDC_SATB =18 ; Sprite Attribute Table
+
+VDC_CTRL 	= $0000
+VDC_DATA_LO = $0002
+VDC_DATA_HI = $0003
+
+; huc6260 - Video Color Encoder (vce)
+
+; The DAC has a palette of 512 colours.
+; bitmap of the palette data is this: 0000000gggrrrbbb.
+; You can read and write the DAC-registers.
+
+VCE_CTRL = $0400    ; write$00 to reset
+VCE_ADDR_LO = $0402 ; LSB of byte offset into palette
+VCE_ADDR_HI = $0403 ; MSB of byte offset into palette
+VCE_DATA_LO = $0404 ; LSB of 16-bit palette data
+VCE_DATA_HI = $0405 ; MSB of 16-bit palette data
+
+TIMER_COUNT = $0c00
+TIMER_CTRL	= $0c01
+
+JOY_CTRL	= $1000
+
+IRQ_MASK	= $1402
+IRQ_STATUS	= $1403
+
+CDR_MEM_DISABLE = $1803
+CDR_MEM_ENABLE  = $1807