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[/] [zipcpu/] - Rev 33

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13 Finally! The beginnings of the new assembler. It's not really polished yet,
and it is quite clunky, but it works!! (Lots of bugs and features left to
fix/implement: #include, #define macro(), #line tracking through the
preprocessor, a means of finding include files (and the preprocessor!) and
more. But, as a beginning, the basics are functinoal.
dgisselq 2555d 09h /zipcpu/
12 Bunch of changes while trying to get a hello world program:
1. Right shifts by 32 or more now result in zero, or all of the top bit in the
case of ASRs.
2. zdump now properly includes addresses with dumped lines.
3. zparser now properly handles immediate values via the .DAT instruction.
dgisselq 2570d 00h /zipcpu/
11 This version works on an FPGA!!!

(Or at least the wdt.S program passes ...)
dgisselq 2570d 08h /zipcpu/
10 Here's the watchdog timer code, as well as some pictures of the register
set.
dgisselq 2570d 22h /zipcpu/
9 This checkin is the result of a watchdog timer test, and everything it took
to get the watchdog timer working. The timer function was simplified,
although it now uses a touch more resources--being able to count down 31
bits instead of 30. The parser was modified, since it couldn't handle
storing to register plus offsets like it was supposed to be able to. The
testbench, zippy_tb, was modified to accept an assembled machine code file
such as I might place on a board to test it.

Lots of work to get it working.

Looking at the files below, it looks like I'll need a second check in to check
in the watchdog timer test itself.
dgisselq 2570d 22h /zipcpu/
8 Fixed the rotate left instruction to work in the zasm parser, and to be
properly referenced in the simulator. The instruction set documentation was
also adjusted to reflect what the CPU actually does.
dgisselq 2571d 04h /zipcpu/
7 Here's the iset.html file that was at one time in the gfx directory, but
which could not be moved due to a bad gateway error ... (Grrr).
dgisselq 2571d 05h /zipcpu/
6 Trying to move iset.html from gfx directory. dgisselq 2571d 05h /zipcpu/
5 Updated colors in the graphics. dgisselq 2571d 05h /zipcpu/
4 dgisselq 2571d 05h /zipcpu/

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