Search found 31 matches

by Enforcer
Sun Jan 12, 2020 4:22 am
Forum: SGDK
Topic: INTERLACED_MODE2 example
Replies: 0
Views: 66

INTERLACED_MODE2 example

I was wondering if anyone has a working example using interlaced mode 2 with SGDK. I’ve been playing with making a text rom for the different video modes so I can capture video timings on real hardware and my code seems to lock up every time I try to switch to Mode 2. I’m sure I’m missing something ...
by Enforcer
Mon Jan 06, 2020 6:21 am
Forum: Hardware
Topic: Cartridge slot questions
Replies: 22
Views: 657

Re: Cartridge slot questions

You’re right, Sik. My bad. I was confusing the lack of IORD and IOWR on Export SMS with no IO at all. Apologies.
by Enforcer
Mon Jan 06, 2020 4:23 am
Forum: Hardware
Topic: Cartridge slot questions
Replies: 22
Views: 657

Re: Cartridge slot questions

That’s interesting as the Export SMS carts do not have IOREQ present. The Japanese SMS has an IORD and IOWR signal. Maybe they are using some logic to try to figure out when an IO request is happening?
by Enforcer
Sun Jan 05, 2020 9:14 pm
Forum: Hardware
Topic: Cartridge slot questions
Replies: 22
Views: 657

Re: Cartridge slot questions

Here are schematics I created of the PowerBase Converter and Mega Adapter just so they don't get lost to time.
by Enforcer
Wed May 15, 2019 4:51 am
Forum: Megadrive/Genesis
Topic: I'm officially building a microcode-level 68000 core
Replies: 43
Views: 9799

Re: I'm officially building a microcode-level 68000 core

Looking forward to your work, Nemesis. I’m actually going to be starting on my own 68K HDL project for a personal project. If I find anything I’ll let you know. I’ve tinkered with the idea of taking the schematic you’ve posted and the text description of it and writing an program that searches for l...
by Enforcer
Fri Apr 12, 2019 4:03 pm
Forum: Megadrive/Genesis
Topic: 8BitDo 2.4G controller
Replies: 3
Views: 1883

Re: 8BitDo 2.4G controller

And stay far away from the BT variant unless you really need BT.
by Enforcer
Sat Feb 23, 2019 7:28 am
Forum: Megadrive/Genesis
Topic: Bus Arbiter and IO Chip Access
Replies: 28
Views: 7402

Re: Bus Arbiter and IO Chip Access

You’re welcome. Your site has been immeasurably useful in my reversing efforts. I’m slowly working on the 5309 and 5308 chips as my day job has picked up. I’ve recently come into owning a high powered metallurgical microscope that I’m looking to make capable of scanning ICs. If I manage to get some ...
by Enforcer
Sat Dec 01, 2018 2:21 am
Forum: Exodus
Topic: Genesis 68K bus timing
Replies: 6
Views: 2179

Re: Genesis 68K bus timing

Me too, if it’s not to much trouble.
by Enforcer
Tue Nov 27, 2018 2:07 pm
Forum: Megadrive/Genesis
Topic: Looping access from 68K and Z80
Replies: 25
Views: 5582

Re: Looping access from 68K and Z80

Ordered last week and got them last night. https://www.questcomp.com/part/4/315-5313A-01/432898428
by Enforcer
Tue Nov 27, 2018 4:54 am
Forum: Megadrive/Genesis
Topic: Looping access from 68K and Z80
Replies: 25
Views: 5582

Re: Looping access from 68K and Z80

That’s pretty cool about reversing the 5313. How does one get involved with that? Also, I got all my chips from quest components. They all look to be in perfect shape. I was surprised at how well packaged it all came.
by Enforcer
Tue Nov 20, 2018 3:56 pm
Forum: Megadrive/Genesis
Topic: Looping access from 68K and Z80
Replies: 25
Views: 5582

Re: Looping access from 68K and Z80

https://www.questcomp.com Is who I went through since they didn’t require a quoting process. The other one I’ve seen was New York Semi.
by Enforcer
Tue Nov 20, 2018 6:41 am
Forum: Megadrive/Genesis
Topic: Looping access from 68K and Z80
Replies: 25
Views: 5582

Re: Looping access from 68K and Z80

My breakout boards cam it but sadly the pads for the pins on the chip were just a tad too short. New boards ordered but with the US holiday coming up it’ll be 10-14 days before I get them back. In the meantime, I found a semiconductor seller that had some genesis chips in stock so I picked up a coup...
by Enforcer
Sat Nov 17, 2018 4:56 am
Forum: Megadrive/Genesis
Topic: Looping access from 68K and Z80
Replies: 25
Views: 5582

Re: Looping access from 68K and Z80

I've removed the Bus Arbiter chip from my VA3. I'm waiting on a breakout board I made to show up. It got lost in the mail. I'll post any results I get once its up and running.
by Enforcer
Tue Nov 13, 2018 1:35 am
Forum: Megadrive/Genesis
Topic: Looping access from 68K and Z80
Replies: 25
Views: 5582

Re: Looping access from 68K and Z80

I believe trying that will lock up the system. I currently have some breakout boards on order and will be documenting the behavior of th IO and Bus Arbiter chips in the next few weeks.
by Enforcer
Mon Oct 15, 2018 9:04 pm
Forum: Megadrive/Genesis
Topic: Bus Arbiter and IO Chip Access
Replies: 28
Views: 7402

Re: Bus Arbiter and IO Chip Access

That makes more sense. Thanks! I’m no where near looking into VDP stuff just yet so I’m sure there will be a ton of rediscoveries.