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You are answering to Sebastien who wrote:


Sorry for the delay. I had to travel for my work.
Programming the PC-E500/S is (to my humble opinion) easier than programming the old Sharp PCs. Here are several justifications:
- The SC 62015 has a better set of instructions (see info.curtin.edu.au:8080/~iwoodsa/pce500/);
- You don't have to worry about memory banks (they don't even exist!);
- Software is organized into "layers": Depending on the complexity of your application you may choose between level 0 (pure machine language), level 1 (I/O Control System) and level 2 (File Control System);
- You may add your own "device drivers" in a *portable* way, either to shadow existing ones (for instance, changing the graphical device driver) or to extend E500's capabilities (by adding a clock, a 16MB smartmedia interface...).

Now let's try to write a SEARCH program:

1) "Hacker's version": The address of the beginning of the BASIC area (I suppose you meant the "Sx:TEXT.BAS" block, a block where BASIC stores the current edited program) is given by the pointer stored at &CB, &CC and &CD (internal memory, however PEEK can access it). Then what you have to do is just reading the length information stored into the block header (sorry, I don't remember the exact location of the information!) and scan the BASIC program...

2) "Regular programmer's version": Open the file using FCS (File Control System), then access its contents using calls to the appropriate functions. The big advantage of this appoach is that your program will also work with files stored on virtual disks, tapes, etc. without any modification (provided the name of the file and the pattern are given as arguments!). And the resulting program is as fast as the first version (because most of the time is spent into the searching algorithm).

3) "BASIC programmer's version": It is perfectly possible to use BASIC for such a purpose.
30 ...
1000 CLOSE #1
1010 END

There is no difference between a SAVEd BASIC program and its edited version, so you don't have to MERGE it with your scanning program...

Unfortunately, if you don't have any document explaining how to use FCS and IOCS
it will be quite impossible to develop useful tools for your E500...



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