Gigatron Hackers

Great development! Even a resolution of about 256 x 240 would enable us to mimic some Arcade classics like Moon Patrol, Frogger etc…

I wanted to keep the standard behavior of the blinkenlights and the normal audio output. Therefore I didn´t change the xoutMask but forwarded the value of the sound sample variable directly to the expansion module. However, my new audio output currently works exclusively for display mode 3 due to sp...

Thanks to the Audio Testboard from Hans61 ( https://github.com/hans61/PCB/tree/main/8Bit-audio-v2 ) and lb3361´s new RAM and IO expansion board v7 ( https://github.com/lb3361/gigatron-lb/tree/main/extension-retro ) I was able to assemble and test the 8 bit audio solution for the Gigatron. Playing mi...

This is a breadboard-tested solution for the 8 bit audio. The 7524 DAC is operated in “voltage mode”, i.e. OUT1 is connected to a fixed voltage (5V) and VREF is connected to a high impedance amplifier input. This is an allowed wiring according to the data sheet and some applications I found elsewher...

The new ROM works great with your GAL based Expansion & IO board ! Is it possible to modify the contents of the vhd file ?

Maybe something like this for the amplification / low-pass filtering. Rin = 20 kOhm, C2 = 1nF, Rg + Rf = Potentiometer 100 kOhm?

Great development! Maybe one could even use two extra LEDs connected to the MCP23S17 outputs for indicating the current Mode 0 - 3 ? Theoretically it should be possible to safe one gate by replacing the 7400 by a 7402. One could connect the enable input of the 74574 to the MCP23S17 GPB7 and the U5/2...

Changing back to E as a variable name now also works fine on my side . Thank you for the clarification!

Under cygwin>env i found COMSPEC=C:\windows\system32\cmd.exe . Using your latest approach I again got the "No rule to make target"-error. However, everything works fine when changing the main makefile to ifdef COMSPEC EX=.exe else EX= endif replacing E= to EX= and ${E} to ${EX} in this and...

This is my pull request for the Cygwin build: https://github.com/lb3361/gigatron-lcc/pulls .

It is also sufficient to change the ${B}rcc entries in these makefiles to ${B}rcc.exe without an additional rule !

Maybe the rule just changes the way how a missing extension is treated under Cygwin...