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Your .CAS file loads and auto-runs OK on MESS, PC-Dragon and T3.

Yes, it is a very weak form of copy protection. The game auto-runs by overwriting the stack. The reason that it gives an I/O error is because the original code was saved to tape with an end address higher than the stack. You can easily defeat the auto-run by entering CLEAR10 before loading the game....

According to the information I found scattered around the web the following bits control the enhanced features of the Motorola MC6847T1 / XC80652P VDG chip . Bit 4: switch to lowercase char set Bit 5: switch to inverted screen Bit 6: switch to light border When I set bit 6 of $FF22 on my real CoCo 2...

Thing is, it happens a lot these days with my Dragon. The wave file reaches its end but the computer doesn't react to it. The files are obviously ok as they load on XRoar, and I checked the CAS file against the WAV file and all seems in place. I doubt very much that your Dragon is at fault. Somethi...

Thanks Rob!

All three chapters of this game are written in BASIC with a small machine code auto-run tagged on. I have attached a zip archive containing all three BASIC programs for anyone who has problems loading the game on a real Dragon. Just CLOAD, and RUN each chapter.

How can you help me? You can email it to me, or is it too big? I don't know how the "upload procedure" works (if that is the best way to go about it), but tell me how and where and I'll try and figure it out. You could use one of the free file hosting sites such as DivShare , Sendspace etc. http://...

This problem is caused by the machine code loading at the top of RAM ($5F60 - $7FFF) and overwriting the stack. Type in "CLEAR200,24415" before loading the machine code.

Thanks, Gareth! I have just uploaded a .cas file (created from your original wave file) to the Uploads section.

Thanks to Munkeyboy, the archive now has a perfect copy of Shaper by Shards Software.

In a case like this, I would create a cas file with a just single copy of the program. I would then put a note in the zip archive with the cas file to explain that the original tape came with three copies.

BTW, I'm looking forward to the release of your wav2cas utility.


Regards,
Steve