Search found 79 matches

by themrcul
Tue Jul 16, 2019 12:51 am
Forum: Demos
Topic: MegaVid FMV codec
Replies: 3
Views: 571

Re: MegaVid FMV codec

Very clever!
by themrcul
Tue Jul 09, 2019 3:55 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

Thanks Tiido, that's a good idea.
by themrcul
Tue Jul 09, 2019 2:06 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

3D render 2 (A side):
3D A.PNG
3D A.PNG (37.08 KiB) Viewed 648 times
Doing this project has been the most fun I've had in a while!
by themrcul
Tue Jul 09, 2019 2:04 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

1.8V net highlighted:
1.8V.PNG
1.8V.PNG (168.55 KiB) Viewed 648 times
1.2V net highlighted:
1.2V.PNG
1.2V.PNG (168.46 KiB) Viewed 648 times
3D render 1 (note I couldn't find 3D models of all components, but it still gives me a good idea of what it will look like in the end):
3D B.PNG
3D B.PNG (126.66 KiB) Viewed 648 times
by themrcul
Tue Jul 09, 2019 2:02 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

Hey fellas, After hours and hours of learning, researching, reading spec sheets, etc and selecting components I believe I have a workable design on my hands. This is a debug board that has a USB port from which I aim to be able to write to the EEPROM with, without needing to unplug the cart and plug...
by themrcul
Thu Jun 20, 2019 12:17 am
Forum: Demos
Topic: Foxyland
Replies: 3
Views: 479

Re: Foxyland

I think the artwork in this game is really nice Mixail. The thoughtful use of colours and clever reuse of tiles is well done.
I also love how the trees rustle when the player runs past them.
Great work and good luck with your project!
by themrcul
Tue Jun 04, 2019 10:36 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

Thanks HardwareMan that's what I thought - I'll need the efficiency of a step-down regulator rather than a linear regulator. I'll fix up the schematic. Sadly the only parts I found that had the parameters I want is in a WFDFN package, so I'll need to use a hot air gun for the first time to get it on...
by themrcul
Tue Jun 04, 2019 4:11 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

Great, thanks for that. I have dropped the /AS line and am using /CAS2 now. I have finished the first version of the schematic now (with a linear power regulator for voltage regulation), ready for drawing a PCB layout from. You guys have been so helpful to me for this project. I am in your debt. One...
by themrcul
Mon May 27, 2019 7:00 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

Ok, so from what you guys have written at the end of this thread: Gen Cart Pinout http://gendev.spritesmind.net/forum/viewtopic.php?f=13&t=517&start=15 /AS is not asserted for DMA, so for my purposes it is useless. So I may as well connect: /CEO /CAS0 /CAS2 /WRL This should give me enough to go with...
by themrcul
Mon May 27, 2019 2:59 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

Thanks guys. Interesting idea to use /CAS2 HardWareMan. The EEPROM I am thinking of using (S29GL032N90TFI040) has a stated total access time of 110ns (this is for random access, not sequential page accesses) - do you think that 110ns is enough time for the EEPROM to be able to get the data if listen...
by themrcul
Sun May 19, 2019 5:15 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

Ok, so I will need to route the Ready/Busy line from the EEPROM through the CPLD to /DTACK, and tri-state the /DTACK line when in normal operation (ie when the PCB is being used in a Mega Drive) but when the CPLD knows it is being written to via the EEPROM writing device it can switch operation of t...
by themrcul
Fri May 17, 2019 11:59 pm
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

Thanks very much Chilly. Just so I understand what is going on electrically: The EEPROM will expect the line to drift high with a pull-up resistor. The MD expects the signal to be low to signify "ready". If the line from the EEPROM is hooked up to the MD directly *without* a pull-up resistor to 3.3V...
by themrcul
Fri May 17, 2019 2:55 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

Hey fellas, I've been progressing with the design, and I've gone back and forward about needing a CPLD or FPGA for the design to work. After a lot of thought and research I have come to the conclusion that everyone else was right from the beginning - I will need a CPLD or FPGA if I am hoping to retr...
by themrcul
Wed May 15, 2019 11:49 pm
Forum: SGDK
Topic: Sega Genesis Dev Kit (SGDK)
Replies: 789
Views: 353311

Re: Sega Genesis Dev Kit (SGDK)

Thanks for your continued and great efforts Stef. I'm looking forward to getting my code base up to date with the new version you have released!
by themrcul
Wed Oct 10, 2018 5:39 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 6758

Re: Cart Design Questions

You guys are amazing, thanks. How do you know all these things!? Anyway, so if my interface between the MD and the ARM chip is 8bit, I can just hook up the lower 8 data lines, and hook the write high/write low to an AND gate, so that 0V = WRITE, 5V = READ. The ARM chip I am looking at now is the ATS...