Search found 463 matches
- Mon Feb 08, 2021 2:27 pm
- Forum: Super 32X
- Topic: 32X Slave SH2 BIOS disassembly
- Replies: 0
- Views: 74143
32X Slave SH2 BIOS disassembly
Yo guys. Here is a disassembly of the Slave SH2 BIOS. I went a bit further than for the master (13 years ago !!!) and I finally got the frame buffer read (it's for the Sega CD32X, stupid!). INITIAL_SP equ $0603F800 dc.l start dc.l INITIAL_SP dc.l start dc.l INITIAL_SP dc.l fail dc.l 0 dc.l fail dc.l...
Re: DMA DEI
- is DEI implemented in any emulator ? Regarding Gens 2.15.4, it looks like it is not implemented. In sh2a.asm, line 5736 : ALIGN32 ; void FASTCALL SH2_DMA0_Request(SH2_CONTEXT *sh2, UINT8 state) ; ecx = context pointer ; edx = request line for external (0 = off, !0 = on) ; ; RETURN: ; nothing ... ...
DMA DEI
Hello fellows. The Hitachi SH-7604 Hardware Manual defines the IE bit (bit #2) in CHCR register (§9.2.4) as : Interrupt Enable Bit (IE): Determines whether or not to request a CPU interrupt at the end of a DMA transfer. When the IE bit is set to 1, an interrupt (DEI) request is setnt to the CPU when...
- Sat Feb 06, 2021 11:00 am
- Forum: Super 32X
- Topic: DMA DREQ delay
- Replies: 1
- Views: 4934
DMA DREQ delay
Once upon a time, Chilly Willy said : When doing 68K to 32X DMA via the FIFO in the 32X, it has a tendency to lose data randomly. Specifically, the DREQ fails to trigger the DMA under unknown circumstances, which means the SH2 DMA stops. If you are checking the FIFO full flags, it will "stick" at fu...
- Thu Feb 04, 2021 1:48 pm
- Forum: Demos
- Topic: Release "Space flies attack" for Sega Genesis / MD
- Replies: 11
- Views: 15975
Re: InDev Space flies attack for Sega Genesis / MD
I'm a simple man.
I see more than 64 colors on screen, I thumb-up.
Good luck to you
I see more than 64 colors on screen, I thumb-up.
Good luck to you
- Mon Jan 25, 2021 8:00 am
- Forum: SGDK
- Topic: Writing multiple VSRAM values per scanline
- Replies: 3
- Views: 6348
Re: Writing multiple VSRAM values per scanline
I'm not sure that I understood everything,
but I have played a few times with HInt, and I must say this rock stable image is great.
Bravo for this piece of work.
but I have played a few times with HInt, and I must say this rock stable image is great.
Bravo for this piece of work.
- Wed Jan 20, 2021 9:52 am
- Forum: Megadrive/Genesis
- Topic: 68K Memory access
- Replies: 9
- Views: 11193
- Wed Jan 20, 2021 9:48 am
- Forum: Megadrive/Genesis
- Topic: 68K Memory access
- Replies: 9
- Views: 11193
Re: 68K Memory access
I'm not sure I correctly understood your question, but there is this block diagram that I like very much : https://gamesx.com/wiki/lib/exe/fetch.php?media=schematics:genesis_block_diagram.png (this diagram states that the address bus is 16 bits, but I'm pretty sure it is 24 bits). Here, you can see ...
- Mon Jan 18, 2021 4:42 pm
- Forum: Demos
- Topic: ELLENICA: An update on my RPGAdventure (2021)
- Replies: 2
- Views: 5206
Re: ELLENICA: An update on my RPGAdventure (2021)
Wow! Impressive AND original.
I'll keep an eye on it.
Kudos to you and good luck ^^
Olivier
I'll keep an eye on it.
Kudos to you and good luck ^^
Olivier
- Tue Nov 24, 2020 12:57 pm
- Forum: Announcement
- Topic: Spritesmind is back
- Replies: 6
- Views: 26775
Re: Spritesmind is back
Thank you so much Kaneda for ensuring this great forum is still up and running.
- Mon Nov 23, 2020 9:10 pm
- Forum: Super 32X
- Topic: 32X memory type
- Replies: 5
- Views: 10262
Re: 32X memory type
I hate to "raise topics from their grave", but I really hope you dear reader will find some resources of interest in this post. So, regarding memory type, here are the Bus State Controler settings made in BIOS : value_offset_348h: DC.L $A55A0001 ; BCR1 Bus Control Register 1 (FFFF FFE0) Master, Big-...
- Tue Dec 24, 2019 9:11 am
- Forum: Demos
- Topic: Mode 7 demo for Genesis/MD
- Replies: 63
- Views: 194261
Re: Mode 7 demo for Genesis/MD
#SlowClap
Bravo !
A hell of an update !
Bravo !
A hell of an update !
Re: Glide 32X
Great answer and lots of useful informations, as usual. Thank you very much Chilly ^^
Re: Glide 32X
OR,
I could use 32X Auto Fill and climb from 8 to 68 triangles per frame.
Still a pity, but ...
I could use 32X Auto Fill and climb from 8 to 68 triangles per frame.
Still a pity, but ...
Re: Glide 32X
I've stated fixed-decimal, but only the representation is decimal (10 bits for the integer part, 5 bits for the "fractional" part).
My implementation uses something between Digital Differential Analyzer and Bresenham's line algorithm.
PS : didn't know of GDM. Thx.
My implementation uses something between Digital Differential Analyzer and Bresenham's line algorithm.
PS : didn't know of GDM. Thx.