As Ed alluded, a crystal by itself is a 2-terminal passive device. It's like one of our small grandchildren on a swing in the park. There's a rate the system tends to go back and forth; but without someone pushing him or her, there's no swinging. The oscillator's electronics in the can do the ...

Not sure why I asked here instead of just trying it. Just put it on a loop to send the character 'a' from the 6502 to my laptop and it seems to be working. I jumpered pin 6 and pin 27. For some reason my FTDI requires hooking up TxD -> TxD and RxD -> RxD which had me thinking that the clock jumper ...

I see floobydust posted while I was typing, but I'll post anyway. The MHz rating is that maximum phase-2 clock rate it is guaranteed to run and meet the timing margins at. It can probably go quite a lot faster than that at room temperature; it's just not guaranteed. The 1.8432MHz input is separate ...

So I'm trying to hook up a Rockwell 6551 to my ben eater breadboard computer and after looking through the datasheet, I'm still a bit confused. Here is the datasheet for reference http://pdf.datasheetcatalog.com/datasheets/2300/501026_DS.pdf .

On the first page in the features section, it mentions ...

This looks really cool! Hoping I can get mine to this point one day. Where do you get that eeprom holder and does it allow you to program it without removing it from the board?

This will disable the cursor, so you shouldn't be expecting to see one. Change it to 00001110 (or 00001111 for blinking).

Just tried this and saw a blinking cursor... thank you!! I've literally been at this like an idiot for 4 nights like an idiot writing the first bit of code for this machine ...

Good catch on the wiring. I actually do have the clock connected to bit 0 on port a and MOSI connected to bit 1 on port A. That was a typo on my part. I suppose I should look closer into the delay. I'm not really sure what is the best way to delay for exactly 40ms, 1.6ms and 72 microseconds. I guess ...

Hi,

I think you are confusing some things.

When using SPI you need to know the following:
MOSI (Master Out Slave In) is the bit output from CPU to the LCD, MISO (Master IN Slave Out) is the bit input from the LCD to the CPU. CLK is the shift clock output to the display, CS is the chipselect for ...

Hey everyone. I recently built a 6502 computer using ben eater's videos. I got everything working on the breadboard with ram, rom, 6522 and 16x2 LCD so I figured I'd try to do something on my own. I bought a 128x64 LCD that uses an ST7920 chip and due to the fact that I've only got 5 pins left on ...