Bring down RAMTOP to top of lower RAM

This now prepends length bytes as well as adding checksum

.gitignore

@@ -1,4 +1,5 @@
 *.tap
-*bin
-*bincs
-ac
+*.block
+body
+header
+ttttt

Makefile

@@ -1,33 +1,28 @@
-program.tap: program.asm headerbincs body.tap
-	pasmo program.asm program.tap
+program.tap: header.block body.block
+	cat header.block body.block > program.tap
 
-headerbincs: headerbin ac
-	cp headerbin headerbincs
-	./ac headerbincs
+header.block: header ttttt
+	./ttttt header header
 
-headerbin: header.tap
-	dd if=header.tap of=headerbin bs=1 count=18
+header: header.asm body.block
+	pasmo header.asm headerlong
+	dd if=headerlong of=header bs=17 count=1
+	rm -f headerlong
 
-header.tap: header.asm body.tap
-	pasmo header.asm header.tap
+body.block: body ttttt
+	./ttttt body data
 
-body.tap: body.asm bodybincs
-	pasmo body.asm body.tap
+body: remload.asm code.asm
+	pasmo remload.asm body
 
-bodybincs: bodybin ac
-	cp bodybin bodybincs
-	./ac bodybincs
-
-bodybin: remload.asm code.asm
-	pasmo remload.asm bodybin
-
-ac: append_checksum.c
-	cc append_checksum.c -o ac
+ttttt: ttttt.c
+	cc ttttt.c -o ttttt
 
 clean:
 	rm -f *.tap
-	rm -f *bin
-	rm -f *bincs
-	rm -f ac
+	rm -f *.block
+	rm -f body
+	rm -f header
+	rm -f ttttt
 
 .PHONY: clean

README.md

@@ -4,7 +4,7 @@ Sometimes it would be useful to run machine code directly from ZX BASIC without
 
 This Makefile will generate a ZX BASIC .tap file with a REM statement containing the machine code, and will automatically run it. Simply amend the code in `code.asm` and run `make`. The file `program.tap` will be created which can be loaded in an emulator or real Spectrum.
 
-The included BASIC routine will CLEAR 59999 and set BORDER and PAPER to black and INK to white. Amend the `remload.asm` routine if this is not desired.
+The included BASIC routine will CLEAR 32767 and set BORDER and PAPER to black and INK to white. Amend the `remload.asm` routine if this is not desired.
 
 ## Requirements
 

append_checksum.c

@@ -1,26 +0,0 @@
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdio.h>
-
-int main(int argc, char *argv[])
-{
-	int fd;
-	unsigned char tally = 0;
-	unsigned char next = 0;
-	if (argc!=2) return -1;
-
-	fd = open(argv[1], O_RDWR|O_APPEND);
-	if (fd<0) return -2;
-
-	while (read(fd, &next, 1)) {
-		//printf("Tally: %X, next byte: %X\n", tally, next);
-		tally ^= next;
-	};
-
-	printf("Final tally: %X\n", tally);
-
-	write(fd, &tally, 1);
-
-	close(fd);
-	return 0;
-}

body.asm

@@ -1,7 +0,0 @@
-bodylength:
-	dw bodyend - bodycontent
-
-bodycontent:
-INCBIN bodybincs
-
-bodyend:

code.asm

@@ -1,2 +1,12 @@
+; This is the main file you will edit to add your machine code to the REM statement.
+; You _must_ include the "entry_point" tag to point to the address which will called by the BASIC "PRINT USR" statement.
+; The default code below is for illustration only, and can be deleted.
+; But REMEMBER TO ADD THE entry_point TAG TO YOUR OWN CODE!
+
+
+data_start:		;if your routine starts here, move the entry_point tag here too
 	ld bc, 42
 	ret
+
+entry_point:		;move this tag to the start point of your code
+	jr data_start

header.asm

@@ -1,6 +1,3 @@
-headerflag:
-	db 0
-
 blocktype:
 	db 0		;basic program
 
@@ -20,5 +17,5 @@ checksum:
 	db 0
 
 bodytap:
-INCBIN body.tap
+INCBIN body.block
 endbodytap:

program.asm

@@ -1,5 +0,0 @@
-headlength:
-	dw 19
-
-INCBIN headerbincs
-INCBIN body.tap

remload.asm

@@ -1,7 +1,5 @@
-org #5cca
+org #5ccb
 
-bodyformat:
-	db #ff
 linenumber:
 	db #00		;MSB
 	db #00		;LSB
@@ -33,10 +31,10 @@ ink:
 	db ':'
 
 clear:
-	db #fd, "59999"	;CLEAR 59999 - presumably code will be loaded somewhere?
+	db #fd, "32767"	;CLEAR 32767 - presumably code will be loaded somewhere?
 	db #0e
 	db 0,0
-	dw 59999
+	dw 32767
 	db 0
 	db ':'
 
@@ -45,7 +43,7 @@ printusr:
 	db "0"		;don't know if actual value is important
 	db #0e
 	db 0,0
-	dw code		;actual call to REM statement code
+	dw entry_point	;actual call to REM statement code
 	db 0
 	db ':'
 

ttttt.c

@@ -0,0 +1,95 @@
+/* McPhail's Tip-Top TAP Top-Tailer
+ * Takes a raw code file as input
+ * Prepends data length and appends xor checksum
+ * Outputs to new file with .block suffix */
+
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <linux/limits.h>
+#include <string.h>
+
+int main(int argc, char *argv[])
+{
+	int fdin, fdout;
+	char outfilename[PATH_MAX];
+	unsigned int count = 0;
+	unsigned char flagopt = 0;
+	unsigned char tally = 0;
+	unsigned char next = 0;
+	if ((argc<2) || (argc>3)) {
+		printf("Please specify file to read.\n");
+		return -1;
+	}
+
+	if (3==argc) {
+		if (!strcmp(argv[2], "header")) flagopt = 1;
+		if (!strcmp(argv[2], "data")) flagopt = 2;
+		if (!flagopt) {
+			printf("Optional flags are \"header\" or \"data\"\n");
+			return -1;
+		}
+	}
+
+	if (! flagopt) {
+		printf("*** WARNING ***\n");
+		printf("*** ttttt is running in RAW mode.\n");
+		printf("*** Have you manually included the format flag as the first byte of the block?\n");
+		printf("*** If not, run again passing 'header' or 'data' as the second parameter.\n");
+		printf("*** WARNING ***\n\n");
+	}
+
+	fdin = open(argv[1], O_RDONLY);
+	if (fdin<0) {
+		printf("Couldn't open %s. for reading\n", argv[1]);
+		return -1;
+	}
+
+	snprintf(outfilename, PATH_MAX, "%s.block", argv[1]);
+	outfilename[PATH_MAX - 1] = '\0';
+	if (! strcmp(argv[1], outfilename)) {
+		printf("Filename too long - would clobber existing.\n");
+		close(fdin);
+		return -1;
+	}
+
+	fdout = open(outfilename, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH);
+	if (fdout<0) {
+		printf("Couldn't open %s for writing.\n", outfilename);
+		close(fdin);
+		return -1;
+	}
+
+	while (read(fdin, &next, 1)) {
+		tally ^= next;
+		count ++;
+	};
+	lseek(fdin, 0, SEEK_SET);
+
+	if (flagopt) count++;
+
+	char lsb = (count+1)&255;
+	char msb = ((count+1)>>8)&255;
+	write(fdout, &lsb, 1);
+	write(fdout, &msb, 1);
+	next = 0;
+	if (flagopt == 2) next = 255;
+	if (flagopt) {
+		write(fdout, &next, 1);
+		tally ^= next;
+	}
+	while (read(fdin, &next, 1)) {
+		write(fdout, &next, 1);
+	}
+	write(fdout, &tally, 1);
+
+	close(fdout);
+	close(fdin);
+
+	printf("File %s written.\n", outfilename);
+	count--;
+	printf("Code length is %d (0x%.4X).\n", count, count);
+
+	return 0;
+}