Sky Shield (Your Computer type-in)
Posted: Sat Jan 22, 2022 11:49 am
Hello everyone!
Pere sent me some scans of the December 1983 issue of Your Computer magazine, which were the listings of Sky Shield by Alan Richards, a Missile Command game written in basic with some machine code routines.
I took me a while to ocr the scans, correct and try them, but I couldn't make it work. So I ended up analyzing it more in deep and discovered that the machine code was missing at least 7 bytes. So I took myself to the Internet Archive and fetched the next issue of the magazine (January 1984). Lo and behold, the author published the missing bytes!
So, I checked and tested everything again, and got it mostly working, but it would crash on several occasions. This time I went again to the Internet Archive, fetched the following issue (February 1984) and guess what, the author had published more missing bytes from the machine code routines...
Finally, I got everything working and I have to say the game is nicely done and quite addictive.
Disclaimer: Typos in the text are there in the original text.
And here you have it for your gaming pleasure!
Instructions
Sky Shield does not work with a disk controller attached.
So start your Dragon 32 (or 64), type PCLEAR8, CLOADM, CLOAD and RUN.
Use the left joystick to play the game and keep the right one disconnected.
Enjoy!
Pere sent me some scans of the December 1983 issue of Your Computer magazine, which were the listings of Sky Shield by Alan Richards, a Missile Command game written in basic with some machine code routines.
I took me a while to ocr the scans, correct and try them, but I couldn't make it work. So I ended up analyzing it more in deep and discovered that the machine code was missing at least 7 bytes. So I took myself to the Internet Archive and fetched the next issue of the magazine (January 1984). Lo and behold, the author published the missing bytes!
So, I checked and tested everything again, and got it mostly working, but it would crash on several occasions. This time I went again to the Internet Archive, fetched the following issue (February 1984) and guess what, the author had published more missing bytes from the machine code routines...
Finally, I got everything working and I have to say the game is nicely done and quite addictive.
Disclaimer: Typos in the text are there in the original text.
And here you have it for your gaming pleasure!
Instructions
Sky Shield does not work with a disk controller attached.
So start your Dragon 32 (or 64), type PCLEAR8, CLOADM, CLOAD and RUN.
Use the left joystick to play the game and keep the right one disconnected.
Enjoy!
