[Staff] Vinegar: CHIP-8/SCHIP interpreter ('emulator')

Post by **benryves** » Mon 27 Feb, 2006 4:43 pm

CoBB wrote:Blasphemy! Screenshot made with TISShot!

*hides*

All the debugging work was done in Pindur! Honest!

kalan_vod · Post by **kalan_vod** » Mon 27 Feb, 2006 4:44 pm

benryves wrote:
kalan_vod wrote:Well I just meant that could you fill the screen. Like not shrinking it 50% but shrinking it 75% or so?
That's what I tried. The problem is that you lose pixels in doing so; if you look at the SCHIP "Blinky" (Pacman) you'll see the dots and walls are one pixel thick and they end up being erased.

Well I thought it would look ok if that had happened, but you say you tried it and it looks crappy so I don't mind

. It is still a great program !

Timendus · Post by **Timendus** » Mon 27 Feb, 2006 4:48 pm

benryves wrote:The best looking method was to scale the entire thing down to 50%, but add an offset of either one x or one y (so four different frames) each loop, creating a flickery greyscale view. For some games this looked OK, for others (such as Ant) it made the graphics a horrible mess.
In the end, I removed that code completely and just use the pan-and-scan method.

The former method sounds interesting. Perhaps you could make that an option in the settings?

Ben, do you still have no Internet on your own PC? I think that could explain how you can be so productive

I shouldn't be wasting time online as much as I do, and actually code stuff

Post by **benryves** » Mon 27 Feb, 2006 4:56 pm

Timendus wrote:The former method sounds interesting. Perhaps you could make that an option in the settings?

I might, but the extra "video modes" added quite a lot of code and were very ugly.

Ben, do you still have no Internet on your own PC?

Nope, no internet access. This is why I only learned about I being modified by the FX55/FX65 instructions today, as the docs I downloaded on Friday evening didn't mention it.

Post by **benryves** » Tue 28 Feb, 2006 11:17 am

Download

The reason I hadn't heard about I being incremented after copying the registers to memory was because... it's wrong.

I added scaling the LCD: here's a "before and after" shot

I also reorganised the "ROMs" folder of the zip so it should be easier to find the right files.

I haven't done anything with the sprite routines. I'll probably add more conventional wrapping, and possibly an option to change the interrupt speed, then call it a day (the interrupt is used on the timers - notice how Joust runs at roughly the same speed, whatever options you set. That's because it sensibly uses the CHIP-8 timer).

Post by **tr1p1ea** » Tue 28 Feb, 2006 11:43 am

I think that resizing effort is very acceptable. With motion, you will never even know!

Im a little bit afraid to ponder about the possibilities for your next project!

.

DJ_O · Post by **DJ_O** » Tue 28 Feb, 2006 2:13 pm

sound awesome, I am installing a few files on my calc now.

Only problem tho you might want to fix for people who can only use an USB cable: in TI connect only the emulator, IBM and UFO can be sent, all other calcs are flagged as incompatible type. Works fine with tio graph link tho

Post by **benryves** » Tue 28 Feb, 2006 2:21 pm

xlibman wrote:sound awesome, I am installing a few files on my calc now.

Only problem tho you might want to fix for people who can only use an USB cable: in TI connect only the emulator, IBM and UFO can be sent, all other calcs are flagged as incompatible type. Works fine with tio graph link tho

Argh, TI-Connect. It's because the files have lowercase characters in the name.

Come to think of it, if you send the 15puzzle file, you won't be able to delete it off your calculator without a RAM clear, as the OS won't display it (urk).

dysfunction · Post by **dysfunction** » Tue 28 Feb, 2006 5:03 pm

Amazing- at a stroke you add tons more games to enjoy!

kalan_vod · Post by **kalan_vod** » Tue 28 Feb, 2006 6:21 pm

Very nice scaling! Btw it looks like a litte gs in there?

Post by **benryves** » Tue 28 Feb, 2006 6:26 pm

kalan_vod wrote:Very nice scaling! Btw it looks like a litte gs in there?

When a black and a white pixel pair are compressed to a single pixel, it is drawn every other frame. Hence the grey, which is very noticable in SCHIP Blinky with the one-pixel wide dots/walls.

kalan_vod · Post by **kalan_vod** » Tue 28 Feb, 2006 6:27 pm

Ahh cool, nice little effect then

.

Post by **benryves** » Wed 01 Mar, 2006 11:06 am

Download

I rewrote the sprite routines to speed them up and allow for wrapping around the screen (title screen of Field, paddle in Brix).

There's a dedicated program to convert CHIP-8 programs included, and I've reconverted all the programs to work with TI-Connect. I also removed X-Mirror (calls 1802 functions) and boot (requires loading at $000 rather than $200). You can also set the speed of the interrupt timer between 0Hz and 255Hz (defaults to the normal 60Hz).

Happy, CoBB?

Post by **tr1p1ea** » Wed 01 Mar, 2006 12:10 pm

The ant game looks really good ... and changing the int timer to 0Hz aye?

.

I am also surprised at how you can pump out those informative readme's so easily

.

Post by **benryves** » Wed 01 Mar, 2006 12:39 pm

tr1p1ea wrote:The ant game looks really good ... and changing the int timer to 0Hz aye? .

0Hz is the slowest (in fact, the timer is stopped). The screenshots were taken at 60Hz, with a highish frame skip. I culled every other frame, then extended the delay, but it's still fractionally faster than the calculator... depending on which browser/GIF viewer you use