Category Archives: General
My PC boards from PCBWay have arrived and look great! Time to get soldering.
I did test the switches wired to my RetroChallenge project solderless breadboard last night, and they work fine. Today I worked on the monochrome NTSC composite video output. First I got the video counters working, and generated a frame with … Continue reading
Since my PCBs aren’t likely to be here before Tuesday evening, and I’ve abandoned the 5×7 matrix LEDs, I’ve had to throw together a second hardware prototype using the HP 5082-7340 hexadecimal LED displays. In this photo, it is running … Continue reading
Late last night I finished the schematic and PCB layout, and ordered boards. As soon as I woke up this morning I realized that I forgot to deal with the 5V CMOS output of the TIA-232-F receiver feeding the non-5V-tolerant … Continue reading
For my previous FPGA-Elf, I used actual hexadecimal displays as per the Popular Electronics construction article. The only hexadecimal LED displays still made are from Broadcom/Avago, don’t have the integral red filter, and cost around $40 each. Used or NOS … Continue reading
I added a 10 microsecond delay after loading the DAC, and adjusted R108. Now the ramps endpoints are full scale, and the positive and negative ramps are reasonably symmetric.
Many people recommended ALRECO in Henderson, Colorado (near Brighton) as a source for aluminum. I haven’t been there, but I’m sure they would have been able to satisfy my needs. However, before I found out about them, I discovered that … Continue reading
I was typing in a browser window, when all of a sudden this dialog popped up: I don’t even know what software was trying to start; I don’t think it was related to the browser. I clicked on the Details … Continue reading
In the twilight of a beautiful day, when fancy seized upon my mind, I passed by the edge of the city and tarried before the wreck of an abandoned house of which only rubble was left.Â In the rubble I … Continue reading