A graphics card for the RC2014; an alternative to the TMS9918A module, adds HDMI output plus some serial output
Designed by MIDI IN in United Kingdom
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What is it? This is an alternative to the TMS9918A video module with a sharp and vibrant picture via HDMI (or rather DVI) and some serial functionality. There is a growing library of demos and games …
Read More…This is an alternative to the TMS9918A video module with a sharp and vibrant picture via HDMI (or rather DVI) and some serial functionality. There is a growing library of demos and games for the RC2014 + TMS (and sometimes + AY) combo. I've designed my own mcu board because I wanted something that resembled a DIP40 chip and I needed more GPIO exposed plus the HDMI socket on-board. That mcu board (dubbed Dr.VIP - an anagram of RP DVI) is included. Dr VIP is not a drop-in replacement for a TMS chip, but this complete module is a drop-in replacement for the more traditional RC2014 TMS video module.
Fully assembled and tested. Plug and play.
For me, a video module is a game-changer for the RC2014 and compatible computers. I've done a lot of work with the TMS chip on RC2014 and my MSX2014 project. I love it, it's very powerful for its time, with 40-col text mode, tile mode, bitmap mode and full colour (lores) mode. However, the real TMS9918A chip as used in J B Langston's module has composite output which is, well, composite. I thought I could make an alternative with the same functionality plus convenient HDMI out and a nice sharp vibrant picture.
As things stand, the serial functionality is limited. I didn't really want to go down the route of full terminal functionality - the point here is that it's a graphics card. But the aim was to allow the computer to be used standalone from startup. With the standard (real TMS chip) module, you still need to use some kind of terminal to communicate with the computer and get nothing from the video card until you've started a program that makes use of it. This module uses the 40-col text mode to display the serial output from startup (the video below demonstrates this). It doesn't provide keyboard input, so you still have to use a terminal or some other keyboard solution for input. There are also some minor features of the TMS chip which aren't implemented at this stage.
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