Implemented graceful FAILURE and PRINT

CHANGELOG.org

@@ -30,6 +30,8 @@ Added hex dump printer DUMP and support words to stage3 FORTH
 Added DOES> and supporting words, and used it to make VARIABLE, CONSTANT, and DEFER in stage3 FORTH
 Added TUCK, MIN, SPACES, :NONAME, FILL, and <> to stage3 FORTH
 Added LSHIFT and RSHIFT to stage2 FORTH
+Added PRINT to stage2 FORTH
+Added Low memory detection to stage2 FORTH and now exits gracefully
 
 ** Changed
 Minor refactor of stage3 FORTH by reepa

bootstrapping Steps.org

@@ -174,7 +174,7 @@ Then we use our M0 Line macro assembler to convert our assembly into hex2 format
 Then we need to assemble that hex into our desired program:
 ./bin/vm --rom roms/stage1_assembler-2 --tape_01 temp2 --tape_02 roms/forth --memory 48K
 
-roms/forth should with the sha256sum of 53619f77736729edc06b79d27d835ada6a4235954c467dd0514e312ec4acf3dc
+roms/forth should with the sha256sum of 3a4a15691297345ac808ce41fae26d5592cd09d759d2feef88c1ef262ddaa5b8
 
 Our forth will first attempt to evaluate any code in tape_01 and then evaluate any code that the user types in
 (Otherwise there is no way for a forth fan to have a chance against the lisp in terms of being able to bootstrap something cool)

stage2/forth.s

@@ -47,6 +47,10 @@
 	;; Loads contents of tape_01
 	;; Starts interface until Halted
 :start
+	HAL_MEM                     ; Get total amount of Memory
+	LOADR R1 @MINIMAL_MEMORY    ; Get our Minimal Value
+	CMPSKIP.GE R0 R1            ; Check if we have enough
+	JUMP @FAILED_INITIALIZATION ; If not fail gracefully
 	LOADR R15 @RETURN_BASE      ; Load Base of Return Stack
 	LOADR R14 @PARAMETER_BASE   ; Load Base of Parameter Stack
 	LOADUI R11 $NEXT            ; Get Address of Next
@@ -65,6 +69,9 @@
 :Cold_Start
 	&Quit_Code
 
+:MINIMAL_MEMORY
+'00100000'
+
 :RETURN_BASE
 '00080000'
 
@@ -74,8 +81,19 @@
 :STRING_BASE
 '000A0000'
 
-	;; The last function you'll ever need to run
+;; FAILED_INITIALIZATION
-	;; HALT
+:FAILED_INITIALIZATION
+	FALSE R1                    ; Set output to TTY
+	LOADUI R2 $FAILED_STRING    ; Prepare our Message
+	CALLI R15 @PRINT_Direct     ; Print it
+	HALT                        ; Be done
+
+:FAILED_STRING
+"Please provide 1MB or More of Memory for this FORTH to run
+"
+
+;; The last function you'll ever need to run
+;; HALT
 :HALT_Text
 "HALT"
 :HALT_Entry
@@ -1097,9 +1115,9 @@
 	&ABORT_Code                 ; Where assembly is Stored
 :ABORT_Code
 	MOVE R2 R1                  ; Protect the string pointer and set output to TTY
-	CALLI R15 @ABORT_PRINT      ; Print our unknown
+	CALLI R15 @PRINT_Direct     ; Print our unknown
 	LOADUI R2 $ABORT_String     ; Get our string
-	CALLI R15 @ABORT_PRINT      ; Print it
+	CALLI R15 @PRINT_Direct     ; Print it
 	LOADUI R0 10                ; NEWLINE
 	FPUTC                       ; Printed
 	LOADR R15 @RETURN_BASE      ; Load Base of Return Stack
@@ -1110,19 +1128,33 @@
 :ABORT_String
 " was not defined nor a valid number"
 
-:ABORT_PRINT
+;; PRINT
+:PRINT_Text
+"PRINT"
+:PRINT_Entry
+	&ABORT_Entry                ; Pointer to ABORT
+	&PRINT_Text                 ; Pointer to Name
+	NOP                         ; Flags
+	&PRINT_Code                 ; Where assembly is Stored
+:PRINT_Code
+	POPR R2 R14                 ; Load pointer to string
+	CALLI R15 @PRINT_Direct     ; Trick to allow direct calls
+	JSR_COROUTINE R11           ; NEXT
+
+:PRINT_Direct
 	LOAD8 R0 R2 0               ; Get a byte
 	ADDUI R2 R2 1               ; Increment to next byte
 	CMPSKIPI.NE R0 0            ; If NULL
 	RET R15                     ; Return to caller
 	FPUTC                       ; Write the CHAR
-	JUMP @ABORT_PRINT           ; Loop until NULL
+	JUMP @PRINT_Direct          ; Loop until NULL
+
 
 ;; strcmp
 :Strcmp_Text
 "STRCMP"
 :Strcmp_Entry
-	&ABORT_Entry                ; Pointer to ABORT
+	&PRINT_Entry                ; Pointer to PRINT
 	&Strcmp_Text                ; Pointer to Name
 	NOP                         ; Flags
 	&Strcmp_Code                ; Where assembly is Stored

test/SHA256SUMS

@@ -1,6 +1,6 @@
 8f465d3ec1cba00a7d024a1964e74bb6d241f86a73c77d95d8ceb10d09c8f7b9  roms/CAT
 59f0502748af32e3096e026a95e77216179cccfe803a05803317414643e2fcec  roms/DEHEX
-53619f77736729edc06b79d27d835ada6a4235954c467dd0514e312ec4acf3dc  roms/forth
+3a4a15691297345ac808ce41fae26d5592cd09d759d2feef88c1ef262ddaa5b8  roms/forth
 4c146297da8c672955698a82207295b28feb389c9856a2c6ea6a60ce7e84260a  roms/lisp
 2b9727381aec15a504c0898189fbc2344209d8e04451e3fa5d743e08e38f64cf  roms/M0
 24a4d74eb2eb7a82e68335643855658b27b5a6c3b13db473539f3e08d6f26ceb  roms/SET