ti84: wip

Gave more priority to CPU in the emulator because initialization would
otherwise be horrendously slow.

blk/555

@@ -1,16 +1,15 @@
 ( Required config: TI_MEM )
-: TI_MEM+ [ TI_MEM LITN ] + ;
-: LCD_PORT_CMD 0x10 ;
-: LCD_PORT_DATA 0x11 ;
-: FNT_WIDTH 3 ;
-: FNT_HEIGHT 5 ;
-( Current Y position on the LCD, that is, where we're going to
-  spit our next glyph. )
-: LCD_CURY 0 TI_MEM+ ;
-: LCD_CURX 1 TI_MEM+ ;
-( two pixel buffers that are 8 pixels wide (1b) by FNT_HEIGHT
-  pixels high. This is where we compose our resulting pixels
-  blocks when spitting a glyph. )
-: LCD_BUF 2 TI_MEM+ ;
-
-1 2 LOADR+
+: TI_MEM+ [ TI_MEM LITN ] @ + ;
+: LCD_PORT_CMD 0x10 ; : LCD_PORT_DATA 0x11 ;
+: FNTW 3 ; : FNTH 5 ;
+( Wait until the lcd is ready to receive a command. It's a bit
+  weird to implement a waiting routine in asm, but the forth
+  version is a bit heavy and we don't want to wait longer than
+  we have to. )
+: LCDWAIT
+    BEGIN,
+        LCD_PORT_CMD INAn,
+        RLA, ( When 7th bit is clr, we can send a new cmd )
+    JRC, AGAIN,
+;CODE
+: LCD$ H@ TI_MEM ! FNTH 2 * 2+ ALLOT ;

blk/556

@@ -1,11 +1,8 @@
-: _wait ( Wait until the lcd is ready to receive a command )
-	( When 7th bit is cleared, we can send a new command )
-    BEGIN LCD_PORT_CMD PC@ 0x80 AND NOT UNTIL ;
-: _cmd LCD_PORT_CMD PC! _wait ;
-: _data! LCD_PORT_DATA PC! _wait ;
-: _data@ LCD_PORT_DATA PC@ _wait ;
-: LCDOFF 0x02 ( CMD_DISABLE ) _cmd ;
-: _col! ( col -- )
-    0x20 ( CMD_COL ) + _cmd ;
-: _row! ( row -- )
-    0x80 ( CMD_ROW ) + _cmd ;
+( Current Y position on the LCD, that is, where we're going to
+  spit our next glyph. )
+: LCD_CURY 0 TI_MEM+ ;
+: LCD_CURX 1 TI_MEM+ ;
+( two pixel buffers that are 8 pixels wide (1b) by FNT_HEIGHT
+  pixels high. This is where we compose our resulting pixels
+  blocks when spitting a glyph. )
+: LCD_BUF 2 TI_MEM+ ;

blk/557

@@ -1,3 +1,8 @@
-( Load a "glyph line" from buffer, left part being in MSB and
-  right part being in LSB. )
-: _gl@
+: _cmd LCD_PORT_CMD PC! LCDWAIT ;
+: _data! LCD_PORT_DATA PC! LCDWAIT ;
+: _data@ LCD_PORT_DATA PC@ LCDWAIT ;
+: LCDOFF 0x02 ( CMD_DISABLE ) _cmd ;
+: _col! ( col -- )
+    0x20 ( CMD_COL ) + _cmd ;
+: _row! ( row -- )
+    0x80 ( CMD_ROW ) + _cmd ;

blk/558

@@ -1,5 +1,16 @@
 : _glyph> ( a -- )
     LCD_CURY C@ _row! LCD_CURX C@ 8 /MOD _col! ( a coff )
-    0x05 ( XINC ) _cmd _data@ DROP
-    FNT_HEIGHT 0 DO LOOP
-
+    0x05 ( XINC ) _cmd _data@ DROP SWAP
+    FNTH 0 DO ( coff a )
+        C@+ 2 PICK 8 -^ LSHIFT
+        _data@ 8 LSHIFT OR
+        LCD_BUF I + 2DUP FNTH + C!
+        SWAP 8 RSHIFT DUP 42 PC! SWAP C!
+    LOOP 2DROP
+    LCD_CURY C@ _row!
+    FNTH 0 DO LCD_BUF I + C@ _data! LOOP
+    LCD_CURY C@ _row! LCD_CURX C@ 8 / 1+ _col!
+    FNTH 0 DO LCD_BUF FNTH + I + C@ _data! LOOP
+    LCD_CURX C@ FNTW + 1+
+    DUP [ 96 FNTW - LITN ] > IF DROP 0 THEN
+    LCD_CURX C! ;

emul/hw/ti/ti84.c

@@ -225,11 +225,8 @@ void draw_pixels()
 void event_loop()
 {
     while (1) {
-        emul_step();
+        emul_steps(100);
         if (lcd_changed) {
-            // To avoid overdrawing, we'll let the CPU run a bit to finish its
-            // drawing operation.
-            emul_steps(100);
             draw_pixels();
         }
         // A low tech way of checking when the window was closed. The proper way

recipes/ti84/Makefile

@@ -1,15 +1,15 @@
-TARGET = os.bin
+TARGET = stage1.bin
 BASEDIR = ../..
-ZASM = $(BASEDIR)/emul/zasm/zasm
-KERNEL = $(BASEDIR)/kernel
-APPS = $(BASEDIR)/apps
+FDIR = $(BASEDIR)/forth
+EDIR = $(BASEDIR)/emul
+STAGE2 = $(EDIR)/stage2
 EMUL = $(BASEDIR)/emul/hw/ti/ti84
 MKTIUPGRADE = mktiupgrade
 
 .PHONY: all
-all: $(TARGET)
-$(TARGET): glue.asm
-	$(ZASM) $(KERNEL) $(APPS) < glue.asm > $@
+all: $(TARGET) 
+$(TARGET): xcomp.fs $(STAGE2)
+	cat xcomp.fs | $(STAGE2) > $@
 
 $(EMUL):
 	$(MAKE) -C ${@:%/ti84=%}

recipes/ti84/xcomp.fs

@@ -0,0 +1,23 @@
+0x8000 CONSTANT RAMSTART
+0xb000 CONSTANT RS_ADDR
+RAMSTART 0x70 + CONSTANT TI_MEM
+212 LOAD  ( z80 assembler )
+262 LOAD  ( xcomp )
+: CODE XCODE ;
+: IMMEDIATE XIMM ;
+: (entry) (xentry) ;
+: : [ ' X: , ] ;
+
+CURRENT @ XCURRENT !
+
+282 LOAD  ( boot.z80 )
+555 LOAD  ( ti.z80 )
+393 LOAD  ( icore )
+(entry) _
+( Update LATEST )
+PC ORG @ 8 + !
+422 437 XPACKR ( core )
+556 558 XPACKR ( ti )
+," 42 42 PC! LCD$ 43 43 PC! BYE "
+ORG @ 256 /MOD 2 PC! 2 PC!
+H@ 256 /MOD 2 PC! 2 PC!