Second Program Loader
While working on the Pac Man transcode I was feeling a little cramped for space since the CoCo 3 has 64k of addressable space for the 6809 but loading a program that wont fit in memory between $E00 to $7FFF is difficult because the CoCo 3 uses some calls from the Disk Basic and Extended Basic while loading and if your program is too big it will over write the Extended Basic and Disk Basic routines and will lock up the computer. There is some great info on specifically his. I used this info and most of his two stage loader programs to make a generic loader that you can simply add to the beginning of your program and no longer worry about loading a huge file onto the CoCo3. It as simple as assemble your program as usual, use the cat command to join the bigloader and your program into a new program and use that new program on the CoCo3.
- Phase 2 – secondary program loader The SPL must set up the memory controller and other essential parts of the system preparatory to loading the Tertiary Program.
- How Boot Loaders Work. The second stage program is loaded by the boot sector program and it does everything you expect the boot loader to do.
Easy The technique is a little hard to wrap your head around but here goes The first program is the main loader it is a small program loaded into RAM at $2000 and while it’s loaded it also overwrites the end of the close routine to make it run itself instead of writing OK on the screen. So once the program is loaded it auto starts and it copies all the data within it’s own large file into memory pages 0 to 7 (or more if you use the tricks mentioned below). The first bit of code that is loaded is actually a secondary program. Since it was loaded in RAM page 0 we know exactly where it is and when we finish copying all of our big program to RAM pages 0 to 7 we then make Block 6 use page 0 and execute the code which is now in RAM at $C000. This code then copies the rest of itself to address $FD00 and then executes it from there. This second program goes uses block 6 which is $C000-$DFFF as the place to read your program in from. While it loads the program it handles all the ORG statements from your assembly language program and all the loading locations and even handles code that would write to RAM $C000-$DFFF so that when the loading is done your code will be exactly where it should be.
Your program will be autoexecuted after it’s loaded. The loader allows you to use memory from $0000 to $FCFF for your program, that’s 64768 bytes! Since it handles ORG statements you could actually use other pages in the CoCo3’s RAM to load even more data from your program. For example if you wanted to load some picture data into RAM pages $23-$25: ORG $FFA0 FCB $23 ORG $FFA1 FCB $24 ORG $FFA2 FCB $25 ORG $0000 Your data for graphics or whatever from $0000 to $5FFF go here Just remember to put the pages back to normal before your code is written to those memory Blocks, unless you are doing something fancy ORG $FFA0 FCB $38 ORG $FFA1 FCB $39 ORG $FFA2 FCB $3A Also keep in mind that the loader uses blocks 5 & 6 so don’t use them if you are doing special loads like the above example. Other things to keep in mind: -This over writes Extended Basic, Color Basic, Disk Basic and Super Extended Basic so your program will not be able to use these ROMS once it’s loaded.The loader uses high speed mode after loading from disk/tape (yeah it should work with a 64k tape based program too) so your program will be executed in high speed mode.The Stack is set to $FE00 which is probably the best place for it, since you can’t use $FD00 to $FDFF for your code because the actual loader uses this space.
The RAM at $FD00 to FDFF is usable after your program is loaded if you want or it can become a nice space for the stack if left alone.RAM used for your code must be between $0000 and $FCFF, if it is bigger the $FCFF it will overwrite the loader code, there is no checking for this in the loader program. To use the loader you simply copy the BigLoader to the start of your program using a binary copy tool. First assemble your huge program for example we call it myprogram.bin. With OSX and Linux use (cygwin under windows or a similar program) the cat command as follows: cat bigloader.bin myprogram.bin bigprogram.bin This simply adds the loader to the start of your program. Under RSDOS all you need is load the new bigprogram.bin since it now contains the loader and your program code. Below is the source code for the loader programs if you modify the code for Part 2 it will change the position of where it thinks your program is and you will need to adjust it accordingly also it must be created as a RAW file not a regular CoCo binary.
Second Program Loader definition, categories, type and other relevant information provided by All Acronyms. SPL stands for Second Program Loader.
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