Maybe they forgot about them? I mean the VA6.8 *still* has them and the markings of 5402:VA5 | 5433: VA6, except it says V6.8 on IC BD M5.. text
My Japanese MD1 says "IC BD M5" on the board, no VAxx.
The VAxx is near the I/O + bus arbiter chip.
Here's a picture of someone else's VA5:
http ...
Search found 53 matches
- Fri Mar 20, 2015 4:35 pm
- Forum: Hardware
- Topic: Model 1 MD PCB hacks topic
- Replies: 17
- Views: 47930
- Fri Mar 20, 2015 3:54 pm
- Forum: Hardware
- Topic: Model 1 MD PCB hacks topic
- Replies: 17
- Views: 47930
- Fri Mar 20, 2015 1:54 pm
- Forum: Hardware
- Topic: Model 1 MD PCB hacks topic
- Replies: 17
- Views: 47930
- Sat Mar 14, 2015 6:33 pm
- Forum: Hardware
- Topic: Model 1 MD PCB hacks topic
- Replies: 17
- Views: 47930
- Sat Mar 14, 2015 2:51 pm
- Forum: Hardware
- Topic: Model 1 MD PCB hacks topic
- Replies: 17
- Views: 47930
I know this post is old... But you deserve a reply.
The 220 ohm resistor on /AS at the 68000 is put when the console is using a FC1001 VDP (315-5313A) with a Motorola CPU. When the CPU is Hitachi CMOS HD68HC000, like this one:
http://www.retroisle.com/others/segamegadrive/Pictures/images_technical ...
The 220 ohm resistor on /AS at the 68000 is put when the console is using a FC1001 VDP (315-5313A) with a Motorola CPU. When the CPU is Hitachi CMOS HD68HC000, like this one:
http://www.retroisle.com/others/segamegadrive/Pictures/images_technical ...
- Mon Jan 12, 2015 1:54 pm
- Forum: Mega/SegaCD
- Topic: MegaCD2 Japan Bios on PAL MegaCD2
- Replies: 23
- Views: 51347
Apparently KRIKzz is unaware of the HINT stuff (register $A12006 and vector $000070) thus Mega Drive everdrives glitch a lot on CD stuff:
http://krikzz.com/forum/index.php?topic=1936.0
http://krikzz.com/forum/index.php?topic=1936.0
- Mon Jan 12, 2015 3:03 am
- Forum: Mega/SegaCD
- Topic: MegaCD2 Japan Bios on PAL MegaCD2
- Replies: 23
- Views: 51347
- Sun Jan 11, 2015 6:34 pm
- Forum: Mega/SegaCD
- Topic: MegaCD2 Japan Bios on PAL MegaCD2
- Replies: 23
- Views: 51347
- Sat Jan 10, 2015 3:08 am
- Forum: Mega/SegaCD
- Topic: MegaCD2 Japan Bios on PAL MegaCD2
- Replies: 23
- Views: 51347
Not really, my Mega Drive is a VA3. And I'm going to only test patches and the translation of the Japanese BIOS to English I wanted to do since forever ... lolTmEE co.(TM) wrote:Now I see how it would work, I had a brainfart.
You will have to deal with TMSS first though, otherwise it gets in the way.
- Sat Jan 10, 2015 2:16 am
- Forum: Mega/SegaCD
- Topic: MegaCD2 Japan Bios on PAL MegaCD2
- Replies: 23
- Views: 51347
- Sat Jan 10, 2015 1:35 am
- Forum: Mega/SegaCD
- Topic: MegaCD2 Japan Bios on PAL MegaCD2
- Replies: 23
- Views: 51347
- Tue Dec 30, 2014 5:56 am
- Forum: Megadrive/Genesis
- Topic: Machine Lock-up
- Replies: 5
- Views: 5732
- Sat Dec 27, 2014 11:12 pm
- Forum: Mega/SegaCD
- Topic: Custom BIOS from cart
- Replies: 4
- Views: 17673
- Sat Dec 27, 2014 7:46 pm
- Forum: Mega/SegaCD
- Topic: Testing boot from CARTRIDGE SLOT at 0x400000
- Replies: 14
- Views: 35325
- Sat Dec 27, 2014 3:03 pm
- Forum: Mega/SegaCD
- Topic: Custom BIOS from cart
- Replies: 4
- Views: 17673