Search found 263 matches

by cero
Wed Oct 30, 2019 7:10 pm
Forum: SGDK
Topic: m68k at risk of being dropped from gcc 11
Replies: 0
Views: 379

m68k at risk of being dropped from gcc 11

The m68k backend is at risk of being dropped from gcc release 11. It uses some old conventions, and needs to be updated. There's a bounty open, currently 5,3k $: https://www.bountysource.com/issues/80706251-m68k-convert-the-backend-to-mode_cc-so-it-can-be-kept-in-future-releases Having a modern gcc ...
by cero
Fri Oct 11, 2019 5:17 pm
Forum: SGDK
Topic: Sprite half in front of PLAN_A and the other half behind.
Replies: 8
Views: 804

Re: Sprite half in front of PLAN_A and the other half behind.

You have another sprite covering your high-prio-bit sprite. That low-prio-bit sprite is higher in sprite priority, which means it covers your high-prio-bit sprite, but lower in the plane bit priority, which means it's below the high-prio plane. Tricks like this are commonly used back to the NES era ...
by cero
Sun Oct 06, 2019 8:12 am
Forum: SGDK
Topic: Help with crash
Replies: 5
Views: 594

Re: Help with crash

You can try addr2line with the generated .elf file and that PC address. Verify with a debugging emulator, use the memory view and see what asm is at the pc address.
by cero
Tue Oct 01, 2019 5:54 pm
Forum: SGDK
Topic: SRAM read / write
Replies: 12
Views: 929

Re: SRAM read / write

The linker script puts code first, then rodata. It's very unlikely for you to ever have 2mb of code.
by cero
Thu Sep 05, 2019 5:31 pm
Forum: Megadrive/Genesis
Topic: Megadrive was always the answer
Replies: 22
Views: 1864

Re: Megadrive was always the answer

"load ROMs quickly for development and debugging" -> both have an usb connection for that. ARM is just a detail.
by cero
Wed Sep 04, 2019 6:59 am
Forum: Megadrive/Genesis
Topic: Megadrive was always the answer
Replies: 22
Views: 1864

Re: Megadrive was always the answer

And the second UMDK and Mega Everdrive x7.
by cero
Sun Sep 01, 2019 7:12 am
Forum: Megadrive/Genesis
Topic: Megadrive was always the answer
Replies: 22
Views: 1864

Re: Megadrive was always the answer

Well yes, GOAC + output mixer + glue would be cheap to make, however the total market for any expansion is low. Even for official Sega ones.
by cero
Tue Aug 27, 2019 5:36 pm
Forum: Megadrive/Genesis
Topic: Sega Tech Docs archive
Replies: 26
Views: 5054

Re: Sega Tech Docs archive

Are the japanese disc docs in japanese?
by cero
Sat Aug 03, 2019 6:28 am
Forum: Video Display Processor
Topic: Seamless dungeon crawler effect
Replies: 11
Views: 2687

Re: Seamless dungeon crawler effect

http://nesdevcompo.nintendoage.com/contest17/
Inherent Smile was my entry for a NES compo, try it ;)
by cero
Mon Jul 29, 2019 6:24 am
Forum: Demos
Topic: Mega Man X
Replies: 16
Views: 10277

Re: Mega Man X

That happens with XGM if you forget to init that specific sfx. No idea if they use it though.
by cero
Tue Jun 18, 2019 6:44 am
Forum: Mega/SegaCD
Topic: FPGA cart of a Sega CD
Replies: 1
Views: 549

FPGA cart of a Sega CD

https://shop.terraonion.com/en/products ... ridge.html

There's now a FPGA version of the sega cd. Bit pricy though.
by cero
Fri May 31, 2019 8:27 am
Forum: Mega/SegaCD
Topic: Bike shedding a new CD-ROM format
Replies: 20
Views: 2858

Re: Bike shedding a new CD-ROM format

Plus with zlib, and using gzopen/gzread you get transparent decompression. It works for both uncompressed and gzipped files.
by cero
Fri May 24, 2019 4:54 pm
Forum: Mega/SegaCD
Topic: Questions on writing a new Mega CD emulator
Replies: 114
Views: 13234

Re: Questions on writing a new Mega CD emulator

Or maybe even an ODE that replaces the drive with a SD card? Which could also lead to MegaSG implementing it.
by cero
Fri May 17, 2019 5:20 pm
Forum: SGDK
Topic: Sega Genesis Dev Kit (SGDK)
Replies: 789
Views: 374178

Re: Sega Genesis Dev Kit (SGDK)

SLZ looks very similar to LZ4 and Stef's LZ4W. The zlib code I had posted needed 4kb, but it's possible to go as low as 765 bytes, based on the 6502 asm implementation.
by cero
Thu May 16, 2019 7:36 am
Forum: SGDK
Topic: Sega Genesis Dev Kit (SGDK)
Replies: 789
Views: 374178

Re: Sega Genesis Dev Kit (SGDK)

As posted in the thread before I sent zlib code in, aplib does not compress better: http://gendev.spritesmind.net/forum/viewtopic.php?f=19&t=2275 It may decompress faster, but as long as the compressor is closed source, it is unusable. I do have an unreleased project using zlib, but there's no need ...