[Coco] FPGA 6809

[Dave Philipsen]

Good news!  After stripping linefeeds and tabs from the source files and 
after resolving which files are for Level1 and which are for Level2 and 
which are shared by both I was able to assemble Krn with the stock OS9 
assembler.  On the CoCo3 FPGA running at 25 MHz with source files on SD 
card it completes the task in 6 seconds.  Not bad!  0 errors, 30 
warnings, and $0F00 program bytes generated.

Dave Philipsen



On , Bill Pierce via Coco wrote:
> Dave, according to William Astle (lwtools author), the lwtools
> assembler IS a single pass assembler. I'm assuming it treats "asm"
> files similar to the way RMA works, by assembling an object file with
> a variable table (or temp file), to reference when functions and
> variables are referenced in other sources then linkiing the object
> files to create the executable.
> I'm not really sure this is the case, and William will probably
> correct me, but I imagine it's something similar.
> Many of the sources in the Nitros9 repo ar multi-part with different
> parts used for different configurations.
> 
> Some of the sources are in RMA format and in that respect, functions
> CAN be called from other sources without "include" or "use"
> references, similar to C and RMA in OS9, hence the need for finding
> all references to any "changed" names, or at least this is what it
> seems is going on. The makefiles is where a lot of the majic is done.
> Remember, this a PC assembler, not OS9.
> 
> I knew you said you were only assembling a few of files, but my intent
> was meant as a warning to any future attemp to include more files.
> There's a lot more there than meets the eye :-)
> 
> I have pulled many of the Nitros9 sources and "massaged" them to
> assemble in Nitros9, some were pretty easy... some were a nightmare,
> some were damned near impossible without almost rewriting them! These
> files have moved a long way from the Coco!
> 
> The Nitros9 repo builds complete disks for 9 different computers, two
> different cpus, two different levels (1 & 2), 2 clock types (NTSC &
> PAL), about 8 different HD systems, 3 or 4 different floppy systems,
> and does "most" of it from one general set of sources in 2 passes...
> one to compile for each machine, and one to create the disk images of
> several types each!
> 
> It's actually pretty amazing to watch it all build... but I would
> still rather see it scroll by on a Coco (or emulator), and as Bill
> Noble will tell you, originally when they started NitrOS9, it WAS all
> done on a Coco! :-)
> 
> 
> 
> 
> Bill Pierce
> "Charlie stole the handle, and the train it won't stop going, no way
> to slow down!" - Ian Anderson - Jethro Tull
> 
> 
> 
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