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The ROM pinout compatible to M27C160.
Pin 32 tied to GND, so it's byte mode.
Pin 10 connected to PLD.Pin19/74374.Clk, so this maybe the even/odd of the original ROM.
Pin 30 tied to A20.(This means if you want to replace with M27C160, the ROM data should be interleaved, as pin 30 is even/odd pin of ...

DIP-42 seems like an awfully big package for an 8-bit mask ROM. You sure all that logic isn't just for the J-Cart stuff?

The only cart I've come across with actual 8-bit mask ROM is F-22 Interceptor, but this cart used a normal 16-bit mask ROM for the part with the code and just used 8-bit accesses ...

It looks like Exodus can highlight the currently displayed area of a plane with a green translucent overlay like in the video. Not sure if that's what he used, but it at least looks sort of similar.

After reading all the DMA fill posts I can find here it appears the answer is no, you're always going to have to go back and fix the start after performing a DMA fill with increment greater than 1.


I think the one exception might be in 128KB mode. When that's enabled, one byte of the initial ...

is that seeking has two consequences for CDD status.
While doing some research on seeking, I found that the duration depend of distance (between current pos and wanted pos), perhaps it's what you call "not ready status" ?
It was already on my "warning" list because of that.
I see it's more ...

main page updated with all I know/understand, be free to fix and confirm data


By main page, you mean this one , right? One thing that I found a little confusing is that you talk a lot about the CDC, but from the description it sounds like you're talking about the MCU that's part of the CDD in ...

On the CXD2500AQ datasheet, it's written
The contents of the subcode interface can be externally read in two ways.

The Game Processor get subcodes using the first way : P-W through SBSO, EXCK based.
It make sense since MCD support CD+G and so needs more than only subcode Q.
The MCE/Game ...

so if I raise SCOR, put anything I want on the 2 first S0S1 bits of the Q subchannel, here we go ?
So S0/S1 never get output on SUBQ. Looking at the CXD2500BQ datasheet, it looks like the DSP does Q channel error detection and only outputs the 80 data bits of the Q subchannel (the other 16-bits ...

We know the 14bits version of the S0 S1 bytes are
SYNC0 ( 00100000000001 ) and SYNC1 ( 00000000010010 )
BUT, and this is my problem,
I'm absolutely unable to find the 8 bits version I need.

why ? because they are reserved patterns (data can't use them, only sync) and so you can't find them on the ...

Since I can't get interrupts from the PC side, I can't wait for Vblank (as far as I know) to do VGA register writes, so there are artifacts.
Looking at the WD90C10 documentation, it looks like you can read the vertical retrace status from bit 3 of IO port $3DA (or $3BA if $3CC/$3C2 bit 0 is 0 ...

So if there is any more information, test code, annotated disassembly etc that you guys could share, I'd be most grateful.


So I actually figured out a bit more since I originally wrote this post. Here are the registers with an updated description


1160: XXXXXXXX
Selects an 8 KiB page from ...

Hello,
I'm facing a problem, the SGDK flash-save sample doesn't work with Blastem, does it supports SRAM saves ?
I just tested Sonic 3 and it works, but it is FRAM.
I'll contact Doragasu to know more about its plugin saveman.
Cheers

Edit: ok I misunderstood, saveman.h is not FRAM save, I gonna ...

I was able to run it on my Model 2 via my MED v1, but it did crash eventually. Neat demo!

I've been working on Sega Pico and Yamaha Copera (a Pico enhanced with some additional audio hardware) emulation recently. I figured it would be good to write up my findings. I'd like to start by thanking notaz for their existing Pico document, superctr for providing an archive of some Sega Pico ...

There's some documentation of the format here. It sounds like the audio is uncompressed in the native PCM format of the Ricoh chip (sign-magnitude) so replacing it should be pretty straightforward. I don't think there are any off the shelf tools to do so though