Mini demo / tech MD stuff posted by members :)

Stef · Post by **Stef** » Wed Feb 14, 2007 2:32 pm

RedAngel wrote:Hey Stef, the cube looks much better in this version! The musics sound great, good job.

Fonzie: I am very happy to see a new version of Equinoxe. Why don´t you make another "Beat it" video to compare with the old version?

Thanks

I guess you first saw the gouraud shaded cube which doesn't look very nice. Here you have the "simple" flat shaded one =)

TmEE co.(TM) · Post by **TmEE co.(TM)** » Thu Feb 15, 2007 8:52 am

Stef wrote:A test of my new Z80 driver :

cube 3D with sample play

- you can activate sample play with button B & C
- you can stop it with button A

I think the second tune (C button) can nicely sounds a demo compo

that kicks ass !!!

Fonzie · Post by **Fonzie** » Thu Feb 15, 2007 6:02 pm

Great release

I just wondered some days ago (with kaneda)... When you read on cartridge with z80, it halt the 68K...

Since z80 is slower than 68K, it may take 68k halted several cycles... And if you are reading intensively (max speed) during DAC mixing, what does happen to the dear 68K?

I mean, your demo appear very smooth... does emulators handle the 68K halt? Maybe i misunderstood something?

Thx

Stef · Post by **Stef** » Thu Feb 15, 2007 6:22 pm

Fonzie wrote:Great release

I just wondered some days ago (with kaneda)... When you read on cartridge with z80, it halt the 68K...

Since z80 is slower than 68K, it may take 68k halted several cycles... And if you are reading intensively (max speed) during DAC mixing, what does happen to the dear 68K?

I mean, your demo appear very smooth... does emulators handle the 68K halt? Maybe i misunderstood something?

Thx

thanks

You're right, when Z80 access 68000 bus it can slowdown 68000 execution... Gens doesn't emulate it nor Fusion i guess.
I tested my rom sometime ago on the real hardware (the cube wasn't displayed for some obscure reason) and the impact isn't that heavy hopefully, you loss 2/3 FPS... by the way, Gens doesn't emulated VDP latency during "no blank" period so it runs significally faster than on real hardware. However Fusion does it

8bitwizard · Post by **8bitwizard** » Sun Feb 25, 2007 12:03 am

Here's what I've been working on.

I was working on a RPG for the ColecoVision, but I was tired of the limtations of that system (not enough colors, and the impending doom of bank switching on a system with no emulator support for it). It was about 22K just for the demo with some maps, so I converted that over. It's now at the same state it was on the Coleco except that I haven't converted the sound yet. http://www.atariage.com/forums/index.ph ... opic=80281

...and I had a game that I tried to get working on the Atari 7800 until it just became too much trouble (the video chip needs its graphics in a weird layout and sucks up too many bus cycles), that I've been converting for the past few weeks: http://www.atariage.com/forums/index.ph ... pic=101645

I've been using my own assembler (which has an ancestry back to my college days back in the mid '80s) which I recently upgraded do multiple CPUs (like 68000 and Z80) in the same source file: http://xi6.com/hacks/

Mostly I'm doing my development using MacSDLMess, with my assembly batch script calling it up as a command-line program. I also have a floppy-drive Multi Game Hunter on a 1601, to which I've added the rear port and an RS-232 converter board. When needed, I can use a version of Macsbug over the serial port to help me debug stuff. And I've had a circuit board made for when I actually have something worth putting on a real cartridge. (for which I've been collecting junk cartridges at a dollar or less so that I'll have shells for the boards)

I've found that the MD/Genesis is one of the easiest systems ever to program for. It doesn't hurt that I did a lot of Z80 and 68000 assembly code back in the day, or that I'm so familiar with the Colecovision hardware.

TmEE co.(TM) · Post by **TmEE co.(TM)** » Mon Feb 26, 2007 6:41 am

37KHz Z80 playback demo available on my site

Stef · Post by **Stef** » Mon Feb 26, 2007 12:45 pm

I updated the first post

TmEE co.(TM) · Post by **TmEE co.(TM)** » Mon Feb 26, 2007 4:47 pm

Stef wrote:I updated the first post

Nice

TmEE co.(TM) · Post by **TmEE co.(TM)** » Thu Mar 01, 2007 6:38 am

Stereo sample player for MD : http://www.hot.ee/tmeeco2/SWAVPLAY.RAR

Jorge Nuno · Post by **Jorge Nuno** » Tue Feb 19, 2008 2:22 pm

My first MD program: (I couldn't die without releasing anything

, but don't get very excited as it's nothing special)

http://trapalhadas.no.sapo.pt/JORGE.BIN
10K

Source (ASM, commented in EN+PT, LOL):
http://trapalhadas.no.sapo.pt/JorgeSrc.zip
20K

"Clique AQUI para prosseguir " If this message appears, click where it says AQUI in the site.

Quick description: Nothing great, there is an Intro text screen with a cycling pallete, pressing the Trigger buttons you get:

A: a scrolling color gradient plane resembling (or not) a sky. Warning this is very BAD!
B: The main reason I'm releasing this: it's a Read/write interface to anywhere you want in the 68000 MMap (instructions on-sceeen), a little glitchy but it works...
C: This was supposed to be a rotating sprite around a movable origin, but it's not working correctly, yet...

Please test this on the machine itself

Credit goes for all of you, THANK YOU, 101% assembly built off a source at devega called ascii.asm (I got the intro text idea from there)...

TmEE co.(TM) · Post by **TmEE co.(TM)** » Tue Feb 19, 2008 5:41 pm

Its much better than my first demo. Great job !!!

Stef · Post by **Stef** » Tue Feb 19, 2008 5:46 pm

TmEE co.(TM) wrote:Stereo sample player for MD : http://www.hot.ee/tmeeco2/SWAVPLAY.RAR

Does it work on real hardware ? my first attempt worked on emulators but failed with real hardware :-/

Stef · Post by **Stef** » Tue Feb 19, 2008 5:55 pm

Jorge Nuno wrote:My first MD program: (I couldn't die without releasing anything , but don't get very excited as it's nothing special)

http://trapalhadas.no.sapo.pt/JORGE.BIN
10K

Source (ASM, commented in EN+PT, LOL):
http://trapalhadas.no.sapo.pt/JorgeSrc.zip
20K

"Clique AQUI para prosseguir " If this message appears, click where it says AQUI in the site.

Quick description: Nothing great, there is an Intro text screen with a cycling pallete, pressing the Trigger buttons you get:

A: a scrolling color gradient plane resembling (or not) a sky. Warning this is very BAD!
B: The main reason I'm releasing this: it's a Read/write interface to anywhere you want in the 68000 MMap (instructions on-sceeen), a little glitchy but it works...
C: This was supposed to be a rotating sprite around a movable origin, but it's not working correctly, yet...

Please test this on the machine itself

Credit goes for all of you, THANK YOU, 101% assembly built off a source at devega called ascii.asm (I got the intro text idea from there)...

Very nice palette rotation choice

It's a nice shot for a first demo in 100% asm

Jorge Nuno · Post by **Jorge Nuno** » Tue Feb 19, 2008 6:18 pm

Stef wrote:Very nice palette rotation choice
It's a nice shot for a first demo in 100% asm

Thanks, But I still need to fix some routines to get Screen-C working correctly, that screen is supposed to be a 2D rotation mini-demo (it just moves around and the sprite warps all over the place, OMGLOL)

TmEE co.(TM) · Post by **TmEE co.(TM)** » Wed Feb 20, 2008 9:28 am

I tried it on real HW and :

A button doesn't do anything.
B works perfectly.
C crashes the proggy and TV usually looses sync...