By the way I just noticed that OS 2.71MP patch wasn't listed...

Is there a real way to have +64K ARC mem ? By "real" I mean durable of course

No, all of those hacks are really unstable. There really isn't any way to expand the memory. (That's a lie, there is one, but it only works on OS's <2.55 and would require a complete rewrite of the garbage collector, but I've looked into that and it's pretty ugly.)

I forgot this topic existed. Anyways, I made a clever little timer that people might find useful. It's accurate to around 2 μs (microseconds) and uses link port for input. Basically, you start with both the tip and the ring ungrounded (not connected to anything) and press go (2nd). When either the ring or the tip are grounded (connected to the base) the timer starts. When the other part is connected, the timer stops.

I made this to determine the speed of a gun I made so it has an option to set the distance between your targets. In this chronometer setup, I made two "gates" that were simply two sheets of aluminum foil separated by 1/4 in. When my projectile passed through the gate, at some point before ripping, the two layers of foil would touch each other and this would ground that pin. By knowing how long it took my object to go from one place to another, I could calculate the speed. (734 ft/s for a 3g object powered by air btw)

Anyways, this thing doesn't deserve it's own topic, so here it is. If you ever use it for something cool, be sure to reply to this topic.

Also, if you ever get trapped in the program, ON quits. And, as you might expect, it doesn't work on the 83+BE.

Sound awesome.

Quote from: thepenguin77 on June 10, 2013, 01:48:27 pm

And, as you might expect, it doesn't work on the 83+BE.

I guess you're using crystals ?
Anyway it's nice to see a coder that takes advantage of 15MHz calcs' hardware, instead of limiting for compatibility with the 83+BE.

Yes I use the crystals, but no they actually don't do the timing. Believe it or not, but the crystals weren't fast enough. The fastest crystal setting is 32768 Hz. That would get you 30 μs resolution. While that is good enough for most applications, I figured why not go all the way and get 2 μs. What actually happens is that the crystal timers measure the CPU speed and then the program counts the number of cycles that pass.

Quick question : which, if any, are limited to the old 84s with more memory than the current ones?

True and most programs which use that RAM would probably detect if the calc has it anyway, so that it works differently. Otherwise, the only non-working programs would be ones made in Early 2009, before the 2007 hardware change and the cause of non-working programs was discovered.

Running TI-Boy.

It's cool to see old utilities get some love. Thanks for your hard work.