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Play the classic snake game. Collect the apples and bonus rodents and avoid the walls.

SnakeSMS-3.png (2.92 KB)

SnakeSMS.png (1.06 KB)

SnakeSMS-2.png (1.28 KB)

screenshot1.png (4.33 KB)

screenshot2.png (1.48 KB)

screenshot4.png (1.62 KB)

Snake-SMS-1.00.zip (11.89 KB)

Snake-SG-1.05.zip (20.05 KB)

Thank you!

Pages created:

https://www.smspower.org/Homebrew/Snakeb-SG
https://www.smspower.org/Homebrew/Snake-SMS

Btw, I don't think your games work on real hardware, I tried with the chinese everdrive and also by burning an eprom to a Super Tennis, always the same result, garbage everywhere. Tried on SMS 1 and 2.

Snake real hardware.JPG (281.97 KB)

Thanks for the feedback. I don't have any real hardware. Would you mind giving this version a try?

Snake-SMS-1.01.zip (16.11 KB)

A bit better, but still full of garbage screen.. Same for SG-1000 versions.

Hi,
I'm pretty sure its caused by writing to vdp too fast (faster than vdp can handle it).

best regards,
- dink

yes, you're accessing VDP too quickly during screen draw phase
if you test it on Emulicious with Emulate VDP Constraints turned on you'll see exactly where it breaks (in the debugger window)

Unfortunately, this is a problem I'm having. It's working perfectly fine in Emulicious with the VDP constraints turned on.

snakescreenshot.png (31.82 KB)

under4mhz wrote

Unfortunately, this is a problem I'm having. It's working perfectly fine in Emulicious with the VDP constraints turned on.

I noticed the 49hz, how does it fare when you try with 60hz/ntsc?

best regards,
- dink

Quote

I noticed the 49hz, how does it fare when you try with 60hz/ntsc?

Both speeds work correctly.

I've added a few more no-ops into my vram copy routine(s). If someone could test this on real hardware again, I'd really appreciate it.

Snake-SMS-1.02.zip (16.11 KB)

The new build works on my Japanese SMS!

There are visual glitches when passing from the under4mhz logo to the title screen, and when passing from the title screen to the game, but otherwise it works fine. I have attached an animated gif showing this.

GIFイメージ.gif (910.29 KB)

under4mhz wrote

Unfortunately, this is a problem I'm having. It's working perfectly fine in Emulicious with the VDP constraints turned on.

if you open the debugger and set "break on invalid VDP access" in breakpoints window, you'll see that there are some places where you violate the safe VDP timing

this means that it *may* break - but depends on the specific timing

raphnet wrote

The new build works on my Japanese SMS!

There are visual glitches when passing from the under4mhz logo to the title screen, and when passing from the title screen to the game, but otherwise it works fine. I have attached an animated gif showing this.

Great. Thanks for your help.

I'm not sure what could be causing the glitch. The name table should be cleared to 0.

sverx wrote

if you open the debugger and set "break on invalid VDP access" in breakpoints window, you'll see that there are some places where you violate the safe VDP timing

this means that it *may* break - but depends on the specific timing

Thanks. I had no idea that was there. It did break on the problem.

Hi under4mhz,

I just released a minor update of Emulicious that manages to replicate the issue you ran into with your original version. Sorry for the inconvenience!
New version looks fine now. :)

Snake-SMS-1.00.png (6.11 KB)

Snake-SMS-1.02.png (3.02 KB)

Awesome. Thanks.

This is probably the best version of the game I'd ever played, thank you :)

I have a suggestion for the MSX version: it would be helpful if the rom was zero-padded to 16k, romsize should always be clean power of 2 for this system.

best regards,
- dink

Thanks. I'll make sure I'll do that. I've been spoiled by ihx2sms which does the padding automatically.

I burned the game to eeprom and tried it with the Sega SC-3000. Only title screen appears and then nothing.

To my shame, I didn't implement SC-3000 keyboard support.

Find a new version attached with keyboard support.

Snake-SG-1.05.zip (20.05 KB)

Thanks, works now!

Revo wrote

A bit better, but still full of garbage screen.. Same for SG-1000 versions.

sega snake is best nostalji

Author	Message
under4mhz Joined: 17 Jan 2020 Posts: 118 Location: Brisbane, AU	Snake Posted: Fri Feb 26, 2021 5:02 am Last edited by under4mhz on Tue Apr 20, 2021 2:53 am; edited 1 time in total
	Play the classic snake game. Collect the apples and bonus rodents and avoid the walls. SnakeSMS-3.png (2.92 KB) SnakeSMS.png (1.06 KB) SnakeSMS-2.png (1.28 KB) screenshot1.png (4.33 KB) screenshot2.png (1.48 KB) screenshot4.png (1.62 KB) Snake-SMS-1.00.zip (11.89 KB) Snake-SG-1.05.zip (20.05 KB)

Revo Guest	Posted: Fri Feb 26, 2021 12:59 pm
Revo Guest	Thank you! Pages created: https://www.smspower.org/Homebrew/Snakeb-SG https://www.smspower.org/Homebrew/Snake-SMS

Revo Guest	Posted: Fri Feb 26, 2021 4:43 pm
Revo Guest	Btw, I don't think your games work on real hardware, I tried with the chinese everdrive and also by burning an eprom to a Super Tennis, always the same result, garbage everywhere. Tried on SMS 1 and 2. Snake real hardware.JPG (281.97 KB)

under4mhz Joined: 17 Jan 2020 Posts: 118 Location: Brisbane, AU	Posted: Mon Mar 01, 2021 3:26 am
	Thanks for the feedback. I don't have any real hardware. Would you mind giving this version a try? Snake-SMS-1.01.zip (16.11 KB)

Revo Guest	Posted: Mon Mar 01, 2021 11:02 am
Revo Guest	A bit better, but still full of garbage screen.. Same for SG-1000 versions.

dink Joined: 09 Dec 2013 Posts: 228 Location: detroit	Posted: Mon Mar 01, 2021 4:55 pm
dink Joined: 09 Dec 2013 Posts: 228 Location: detroit	Hi, I'm pretty sure its caused by writing to vdp too fast (faster than vdp can handle it). best regards, - dink

sverx Joined: 05 Sep 2013 Posts: 3826 Location: Stockholm, Sweden	Posted: Mon Mar 01, 2021 7:19 pm
	yes, you're accessing VDP too quickly during screen draw phase if you test it on Emulicious with Emulate VDP Constraints turned on you'll see exactly where it breaks (in the debugger window)

under4mhz Joined: 17 Jan 2020 Posts: 118 Location: Brisbane, AU	Posted: Tue Mar 02, 2021 12:00 am
	Unfortunately, this is a problem I'm having. It's working perfectly fine in Emulicious with the VDP constraints turned on. snakescreenshot.png (31.82 KB)

dink Joined: 09 Dec 2013 Posts: 228 Location: detroit	Posted: Tue Mar 02, 2021 1:06 am
dink Joined: 09 Dec 2013 Posts: 228 Location: detroit	under4mhz wrote Unfortunately, this is a problem I'm having. It's working perfectly fine in Emulicious with the VDP constraints turned on. I noticed the 49hz, how does it fare when you try with 60hz/ntsc? best regards, - dink

under4mhz Joined: 17 Jan 2020 Posts: 118 Location: Brisbane, AU	Posted: Tue Mar 02, 2021 1:54 am
	Quote I noticed the 49hz, how does it fare when you try with 60hz/ntsc? Both speeds work correctly.

under4mhz Joined: 17 Jan 2020 Posts: 118 Location: Brisbane, AU	Posted: Tue Mar 02, 2021 2:20 am
	I've added a few more no-ops into my vram copy routine(s). If someone could test this on real hardware again, I'd really appreciate it. Snake-SMS-1.02.zip (16.11 KB)

raphnet Joined: 29 Mar 2015 Posts: 67 Location: Japan	Posted: Tue Mar 02, 2021 2:40 am
raphnet Joined: 29 Mar 2015 Posts: 67 Location: Japan	The new build works on my Japanese SMS! There are visual glitches when passing from the under4mhz logo to the title screen, and when passing from the title screen to the game, but otherwise it works fine. I have attached an animated gif showing this. GIFイメージ.gif (910.29 KB)

sverx Joined: 05 Sep 2013 Posts: 3826 Location: Stockholm, Sweden	Posted: Tue Mar 02, 2021 10:32 am
	under4mhz wrote Unfortunately, this is a problem I'm having. It's working perfectly fine in Emulicious with the VDP constraints turned on. if you open the debugger and set "break on invalid VDP access" in breakpoints window, you'll see that there are some places where you violate the safe VDP timing this means that it may break - but depends on the specific timing

under4mhz Joined: 17 Jan 2020 Posts: 118 Location: Brisbane, AU	Posted: Tue Mar 02, 2021 11:14 pm Last edited by under4mhz on Tue Mar 02, 2021 11:15 pm; edited 1 time in total
	raphnet wrote The new build works on my Japanese SMS! There are visual glitches when passing from the under4mhz logo to the title screen, and when passing from the title screen to the game, but otherwise it works fine. I have attached an animated gif showing this. Great. Thanks for your help. I'm not sure what could be causing the glitch. The name table should be cleared to 0.

under4mhz Joined: 17 Jan 2020 Posts: 118 Location: Brisbane, AU	Posted: Tue Mar 02, 2021 11:15 pm
	sverx wrote if you open the debugger and set "break on invalid VDP access" in breakpoints window, you'll see that there are some places where you violate the safe VDP timing this means that it may break - but depends on the specific timing Thanks. I had no idea that was there. It did break on the problem.

Calindro Joined: 14 Apr 2013 Posts: 624	Posted: Thu Mar 04, 2021 5:53 pm
Calindro Joined: 14 Apr 2013 Posts: 624	Hi under4mhz, I just released a minor update of Emulicious that manages to replicate the issue you ran into with your original version. Sorry for the inconvenience! New version looks fine now. :) Snake-SMS-1.00.png (6.11 KB) Snake-SMS-1.02.png (3.02 KB)

under4mhz Joined: 17 Jan 2020 Posts: 118 Location: Brisbane, AU	Posted: Fri Mar 05, 2021 5:19 am
	Awesome. Thanks.

dink Joined: 09 Dec 2013 Posts: 228 Location: detroit	Posted: Sun Apr 11, 2021 12:59 am
dink Joined: 09 Dec 2013 Posts: 228 Location: detroit	This is probably the best version of the game I'd ever played, thank you :) I have a suggestion for the MSX version: it would be helpful if the rom was zero-padded to 16k, romsize should always be clean power of 2 for this system. best regards, - dink

under4mhz Joined: 17 Jan 2020 Posts: 118 Location: Brisbane, AU	Posted: Tue Apr 13, 2021 12:51 am
	Thanks. I'll make sure I'll do that. I've been spoiled by ihx2sms which does the padding automatically.

Sammy138 Joined: 23 May 2020 Posts: 7 Location: Finland	Posted: Mon Apr 19, 2021 4:26 pm
Sammy138 Joined: 23 May 2020 Posts: 7 Location: Finland	I burned the game to eeprom and tried it with the Sega SC-3000. Only title screen appears and then nothing.

under4mhz Joined: 17 Jan 2020 Posts: 118 Location: Brisbane, AU	Posted: Tue Apr 20, 2021 2:52 am
	To my shame, I didn't implement SC-3000 keyboard support. Find a new version attached with keyboard support. Snake-SG-1.05.zip (20.05 KB)

Sammy138 Joined: 23 May 2020 Posts: 7 Location: Finland	Posted: Tue Apr 20, 2021 2:40 pm
Sammy138 Joined: 23 May 2020 Posts: 7 Location: Finland	Thanks, works now!

matlabi Joined: 28 Apr 2021 Posts: 1	sega snake Posted: Wed Apr 28, 2021 8:12 pm
matlabi Joined: 28 Apr 2021 Posts: 1	Revo wrote A bit better, but still full of garbage screen.. Same for SG-1000 versions. sega snake is best nostalji

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