sms: working on real hardware!

More portable

blk/081

@@ -1,6 +1,6 @@
 RAMSTART  FUTURE USES          +3c       BLK(*
-+02       CURRENT              +3e       XYPOS
-+04       HERE                 +40       FUTURE USES
++02       CURRENT              +3e       FUTURE USES
++04       HERE                 
 +06       C<?                  +51       CURRENTPTR
 +08       C<* override         +53       (emit) override
 +0a       NLPTR                +55       (key) override

blk/083

@@ -7,8 +7,8 @@ WORDBUF is the buffer used by WORD
 BOOT C< PTR is used when Forth boots from in-memory
 source. See "Initialization sequence" below.
 
-XYPOS Current position of the cursor on screen. The meaning of
-the pos in terms of row and cols is driver-dependent.
+
+
 
 
 

blk/393

@@ -3,7 +3,6 @@
 : HERE 0x04 RAM+ ;
 : CURRENT* 0x51 RAM+ ;
 : CURRENT CURRENT* @ ;
-: XYPOS 0x40 RAM+ ;
 
 ( w -- a f )
 : FIND CURRENT @ SWAP _find ;

blk/427

@@ -1,10 +1,10 @@
 ( handle backspace: go back one char in IN>, if possible, then
-  emit SPC + BS )
+  emit BS + SPC + BS )
 : (inbs)
     ( already at IN( ? )
     IN> @ IN( = IF EXIT THEN
     IN> @ 1- IN> !
-    SPC BS
+    BS SPC BS
 ;
 
 : KEY

blk/428

@@ -1,16 +1,16 @@
-: (rdlnc)                   ( -- f )
+: (rdlnc) ( -- c )
     ( buffer overflow? same as if we typed a newline )
-    IN> @ IN) = IF 0x0a ELSE KEY THEN     ( c )
+    IN> @ IN) = IF 0x0a ELSE KEY THEN ( c )
     DUP 0x7f = IF DROP 0x8 THEN ( del? same as backspace )
     DUP 0x0a = IF DROP 0xd THEN ( lf? same as cr )
-    ( echo back )
-    DUP EMIT                    ( c )
     ( bacspace? handle and exit )
     DUP 0x8 = IF (inbs) EXIT THEN
+    ( echo back )
+    DUP EMIT ( c )
     ( write and advance )
-    DUP     ( keep as result )  ( c c )
+    DUP ( keep as result ) ( c c )
 ( We take advantage of the fact that c's MSB is always zero and
   thus ! automatically null-terminates our string )
-    IN> @ ! 1 IN> +!            ( c )
+    IN> @ ! 1 IN> +! ( c )
     ( if newline, replace with zero to indicate EOL )
     DUP 0xd = IF DROP 0 THEN ;

blk/620

@@ -1,3 +1,3 @@
 Sega Master System Recipe
 
-622 VDP
+622 VDP                        630 PAD

blk/622

@@ -13,4 +13,4 @@ the screen is reached, we wrap up to the top.
 When reaching a new line, we clear that line and the next to
 help readability.
 
-Load range: 623-623
+Load range: 623-628

blk/623

@@ -1,3 +1,4 @@
+: XYPOS [ VDP_MEM LITN ] ;
 CODE _ctl ( a -- sends LSB then MSB )
     HL POPqq, chkPS,
     A L LDrr, VDP_CTLPORT OUTnA,

blk/627

@@ -1,6 +1,15 @@
+: _cell! ( tilenum pos )
+    2 * 0x7800 OR _ctl ( tilenum ) _data 1 _zero ;
+: _spc! 0 ( blank ) XYPOS @ _cell! ;
+: _lf
+    _spc! XYPOS @ [ VDP_COLS LITN ] / 1+ [ VDP_ROWS LITN ] MOD
+    [ VDP_COLS LITN ] * XYPOS ! ;
+: _bs _spc! XYPOS @ 1-
+    [ VDP_COLS VDP_ROWS * LITN ] MOD XYPOS ! ;
 : (emit)
-    XYPOS @ 2 * 0x7800 OR _ctl
-    0x20 - 0x5e MIN ( tilenum ) _data 1 _zero
+    DUP 0x08 = IF DROP _bs EXIT THEN
+    DUP 0x0d = IF DROP _lf EXIT THEN
+    0x20 - DUP 0< IF DROP EXIT THEN
+    0x5e MIN ( tilenum ) XYPOS @ _cell!
     XYPOS @ 1+ DUP [ VDP_COLS VDP_ROWS * LITN ]
-    = IF DROP 0 THEN XYPOS !
-;
+    = IF DROP 0 THEN XYPOS ! ;

blk/628

@@ -6,4 +6,5 @@
     ( sprite, inverted colors ) 0x3f _data 15 _zero
     0x4000 _ctl 0x5e 0 DO ~FNT I 7 * + _sfont LOOP
     0 XYPOS !
+    ( bit 6, enable display, bit 7, ?? ) 0x81c0 _ctl
 ;

blk/630

@@ -0,0 +1,16 @@
+Pad driver - read input from MD controller
+
+Conveniently expose an API to read the status of a MD pad A.
+Moreover, implement a mechanism to input arbitrary characters
+from it. It goes as follow:
+
+* Direction pad select characters. Up/Down move by one,
+  Left/Right move by 5
+* Start acts like Return
+* A acts like Backspace
+* B changes "character class": lowercase, uppercase, numbers,
+  special chars. The space character is the first among special
+  chars.
+* C confirms letter selection
+
+                                                        (cont.)

blk/631

@@ -0,0 +1,6 @@
+This module is currently hard-wired to VDP driver, that is, it
+calls vdp's routines during (key) to update character
+selection.
+
+Load range: 632-637
+

blk/632

@@ -0,0 +1,12 @@
+: _prevstat [ PAD_MEM LITN ] ;
+: _sel [ PAD_MEM 1+ LITN ] ;
+: _next [ PAD_MEM 2+ LITN ] ;
+
+( Put status for port A in register A. Bits, from MSB to LSB:
+Start - A - C - B - Right - Left - Down - Up
+Each bit is high when button is unpressed and low if button is
+pressed. When no button is pressed, 0xff is returned.
+This logic below is for the Genesis controller, which is modal.
+TH is an output pin that swiches the meaning of TL and TR. When
+TH is high (unselected), TL = Button B and TR = Button C. When
+TH is low (selected), TL = Button A and TR = Start. )

blk/633

@@ -0,0 +1,15 @@
+CODE _status
+    A 0b11111101 LDrn, ( TH output, unselected )
+    PAD_CTLPORT OUTnA,
+    PAD_D1PORT INAn,
+    0x3f ANDn, ( low 6 bits are good )
+    B A LDrr,  ( let's store them )
+( Start and A are returned when TH is selected, in bits 5 and
+  4. Well get them, left-shift them and integrate them to B. )
+    A 0b11011101 LDrn, ( TH output, selected )
+    PAD_CTLPORT OUTnA,
+    PAD_D1PORT INAn,
+    0b00110000 ANDn,
+    A SLAr, A SLAr, B ORr,
+    PUSHA,
+;CODE

blk/634

@@ -0,0 +1,8 @@
+: _chk ( c --, check _sel range )
+    _sel C@ DUP 0x7f > IF 0x20 _sel C! THEN
+    0x20 < IF 0x7f _sel C! THEN ;
+CREATE _ '0' C, ':' C, 'A' C, '[' C, 'a' C, 0xff C,
+: _nxtcls
+    _sel @ _ BEGIN ( c a ) C@+ 2 PICK > UNTIL ( c a )
+    1- C@ SWAP DROP _sel !
+;

blk/635

@@ -0,0 +1,13 @@
+: _updsel ( -- f, has an action button been pressed? )
+    _status _prevstat C@ OVER = IF DROP 0 EXIT THEN
+    DUP _prevstat C! ( changed, update ) ( s )
+    0x01 ( UP ) OVER AND NOT IF 1 _sel +! THEN
+    0x02 ( DOWN ) OVER AND NOT IF -1 _sel +! THEN
+    0x04 ( LEFT ) OVER AND NOT IF -5 _sel +! THEN
+    0x08 ( RIGHT ) OVER AND NOT IF 5 _sel +! THEN
+    0x10 ( BUTB ) OVER AND NOT IF _nxtcls THEN
+    ( update sel in VDP )
+    _chk _sel C@ (emit) -1 XYPOS +!
+    ( return whether any of the high 3 bits is low )
+    0xe0 AND 0xe0 <
+;

blk/636

@@ -0,0 +1,9 @@
+: (key)
+    _next C@ IF _next C@ 0 _next C! EXIT THEN
+    BEGIN _updsel UNTIL
+    _prevstat C@
+    0x20 ( BUTC ) OVER AND NOT IF DROP _sel C@ EXIT THEN
+    0x40 ( BUTA ) AND NOT IF 0x8 ( BS ) EXIT THEN
+    ( If not BUTC or BUTA, it has to be START )
+    0xd _next C! _sel C@
+;

blk/637

@@ -0,0 +1,2 @@
+: PAD$
+    0xff _prevstat C! 'a' _sel C! 0 _next C! ;

recipes/sms/Makefile

@@ -7,6 +7,9 @@ all: $(TARGET)
 $(TARGET): xcomp.fs $(STAGE)
 	cat xcomp.fs | $(STAGE) > $@
 
+os.sms: $(TARGET)
+	dd if=$(TARGET) bs=32752 conv=sync | cat - sega.bin > $@
+
 $(EMUL):
 	$(MAKE) -C ${@:%/sms=%}
 

recipes/sms/xcomp.fs

@@ -3,10 +3,14 @@
 0xdd00 CONSTANT RS_ADDR
 ( Memory register at the end of RAM. Must not overwrite )
 0xddca CONSTANT PS_ADDR
+RAMSTART 0x70 + CONSTANT VDP_MEM
 0xbf   CONSTANT VDP_CTLPORT
 0xbe   CONSTANT VDP_DATAPORT
 32     CONSTANT VDP_COLS
 24     CONSTANT VDP_ROWS
+RAMSTART 0x72 + CONSTANT PAD_MEM
+0x3f   CONSTANT PAD_CTLPORT
+0xdc   CONSTANT PAD_D1PORT
 212 LOAD  ( z80 assembler )
 : ZFILL, ( u ) 0 DO 0 A, LOOP ;
 262 LOAD  ( xcomp )
@@ -22,11 +26,11 @@ CURRENT @ XCURRENT !
 393 LOAD  ( xcomp core low )
 CREATE ~FNT CPFNT7x7
 623 628 LOADR ( VDP )
-: (key) 4 ;
+632 637 LOADR ( PAD )
 420 LOAD  ( xcomp core high )
 (entry) _
 ( Update LATEST )
 PC ORG @ 8 + !
-," VDP$ " EOT,
+," VDP$ PAD$ " EOT,
 ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
 H@ 256 /MOD 2 PC! 2 PC!

recipes/ti84/Makefile

@@ -19,8 +19,7 @@ emul: $(EMUL) $(TARGET)
 	$(EMUL) $(TARGET)
 	
 os.rom: $(TARGET)
-	cp $(TARGET) $@
-	truncate -s 1M $@
+	dd if=$(TARGET) bs=1M of=$@ conv=sync
 
 os.8xu: os.rom
 	$(MKTIUPGRADE) -p -k keys/0A.key -d TI-84+ os.rom $@ 00