Denial

Hi everyone. New to the board and I know this is an old thread, but I was doing some searching and ran across it and couldn't resist replying. For sure not vaporware, as I have one. No idea if it still works as it has been sitting on a shelf for 20+ years in my basement. Great to see it exist. If I...

srowe's link gives the answer: NTSC machines have a 14.31818 MHz crystal oscillator, which gets divided by 14 to produce the 1.022727 MHz clock while on PAL machines it's a 17.734475 MHz crystal divided by 16 to give a 1.108404 MHz clock. These odd frequencies are required for the colour burst sign...

The 555 holds the reset line low for a period of time upon power up for voltages to stabilize. I figured that it wasn't the clock, it was just a wild guess. Then where is the 1Mhz clock? Thanks for the responses, it helps me a lot. I don't know how well high school students will appreciate it, but ...

I do have a C64, but no SD2IEC.
You see it came down to buying an oscilloscope or an SD2IEC. Well one is more useful, I'll let you decide. Just a matter of priorities.

These are not my motherboards I took the pictures from online. They are the same type though.

Hello everyone I don't' know if this is the right place to put this. More questions! I'm going to be teaching a short class on 1980's computers. I'm mostly showing a demonstration, but I've been asked to talk a little bit about the internals. Here's what I know so far. If I have anything wrong is wr...

I don't have a way of loading a .D64 file though.

Got a better picture

Reviving my own topic here...

I tried aligning my drive today. I got this and I'm not sure what I'm doing wrong. The probes are attached to UF4 pin 7,8. Any advice?
Sorry for the blurry pictures.

orion70 wrote:LOL
This looks much tastier thank the ZX Spectrum cake

At first I thought that it was a gingerbread house.

Why would you want to eat a computer?
Or your favorite logo?

I wonder if in 50 years my 5$ in my VIC-20 are going to pay off.

The reason why we still run NTSC television signals in the US is because it's so great we don't need to replace it.

(Just kidding where I live I don't even get internet (except dial up). Every time I travel to Europe I'm amazed at all the great stuff there is over there)

The PLA is an EPROM?

Good advice. But if for some reason you have to (like availability), I recommend using eBay because you can file a claim if there is an issue and the buyer always wins. I once got a RIOT chip for a Atari 2600 from a Chinese seller and it was the real thing. Also got a great deal on a couple authent...