F18A – FPGA Based TMS9918A

The TI-99/4A Master Title Screen on a VGA LCD monitor

Development Journal Index: The FPGA Development Board September 7, 2010 FPGA Education, Books, and Community February 1, 2011 Learn VHDL or Verilog? February 5, 2011 Making Boards July 14, 2011 F18A PRE-ORDERS Open! February 9, 2012 F18A Features July 21, 2012 Mounting the F18A […]

Integer to ASCII Conversion in Assembly

I wrote this code to demonstrate how to convert a binary number into ASCII digits for display on the screen. This is a complete program that has been tested on a real TI-99/4A computer. The code assumes VDP graphics mode I (the default) and includes the VDP routines I wrote as replacements to the ones […]