#TRS80 EMULATOR MAC CODE#
#TRS80 EMULATOR MAC TRIAL#
#TRS80 EMULATOR MAC PLUS#
#TRS80 EMULATOR MAC SERIES#

Later, you can go through each checkpoint one at a time fixing any discrepancies in that section.ДЄnd, more importantly, set the width to the same width as the Color Computer listings in Rainbow. Just provide the checkpoints to the script, and then you can type as much as you want. With this program, if you prefer to type in the whole program and then debug, you can do it. In the original RCHECK+, it was critical to verify the checksums every time you reached a checkpoint it was difficult to see previous checkpoints. Since there is no character at -1 in any string, it comes out as null, and the script thinks that the very first line is preceded by an end-of-line marker. IвЂ™m ignoring two bytes that are probably important.ДЄnd, in order to successfully report on the first line, I set the counter to -1. This is probably not completely kosher, but it works so far. So I have the script look for character zero, grab (and sum) the line number, and then skip ahead to after the line number. CoCo BASIC uses the null character, character zero, to mark the end of a line.

You may find my edit script for 42 Astounding Scripts useful for pasting this or any scripts into TextEdit or your favorite text editor.ДЄs you can see, besides requiring that decb be installed on your computer, the only tricky part of the program is detecting where BASIC lines begin. You can create a profile that will set the background and foreground colors.

print ' rcheck: use the original rcheck algorithm instead of rcheck+ '.

#TRS80 EMULATOR MAC CODE#

# finally, loop through the tokenized code and add up each character.

open $codeHandle, $tokenFile or die('Can't open $tokenFile: $!').

# character zero marks the end of a line, and thus also the beginning of a line.

print `hexdump -C $tokenFile` if $debug.

`/usr/local/bin/decb copy -b -t '$basicFile' '$tokenFile'`.

($tokenHandle, $tokenFile) = tempfile(UNLINK=>1).

help('No input file provided.') if !$basicFile.

# run the Rainbow checksum against a BASIC text file.

It certainly works on the BASIC code IвЂ™ve tested it on so far. But poking at it on the CoCo by adding, removing, and altering strings, BASIC statements, and line numbers, and watching how the checksum changes, IвЂ™m pretty sure I have it. I donвЂ™t have the listing for RCHECK+, so I canвЂ™t know for sure what the algorithm is.

#TRS80 EMULATOR MAC TRIAL#

There was a lot of trial and error getting this to work. Which makes it possible to write rcheck in Perl and run it on a text file created by decb. But then I discovered that the decb program from the ToolShed suite can take a text BASIC listing and tokenize it to a standalone file.

#TRS80 EMULATOR MAC PLUS#

3 The values that RCHECK+ uses are the tokenized values, which means that GOTO is not G plus O plus T plus O, but rather the sum of hex 81 and A5, the tokenization of GOTO. The program is so useful that, even though I would much prefer to type BASIC code on a modern computer in a modern text editor with a modern keyboard, I didnвЂ™t. All itвЂ™s doing is adding up the ASCII values of the code in RAM, cycling back to zero after a sum of 255.

It turns out that this is a very simple checksum.

#TRS80 EMULATOR MAC SERIES#

1 The listing in the magazine contains a series of checkpoints, such as this for TRENCH in the July 1986 issue of The Rainbow: checkpointДЄfter typing line 7, the checksum should be 208 after typing line 15, it should be 178 and after typing in the entire program, it should be 180. ItвЂ™s a machine-language program that you load into memory before typing the code, and when you press the down arrow, it calculates a very simple checksum from the code youвЂ™ve typed. One of the big advantages of The Rainbow over other magazines of its era is the program RCHECK+. I recently acquired a TRS-80 Color Computer 2, so IвЂ™ve been typing in old code from The Rainbow. I may be the only person who still enjoys typing in code from old books and magazines, but I do enjoy it, and enough to have written a modern version of those old books, 42 Astoundingly Useful Scripts and Automations for the Macintosh. The only text editor I could find that would wrap exactly at 32 characters was vi in the Terminal.

Trs80 emulator mac