Search found 81 matches

by themrcul
Thu Aug 29, 2019 3:17 am
Forum: Demos
Topic: Devwill Too MD
Replies: 12
Views: 3535

Re: Devwill Too MD

Great work for you and your team Nemezes!
by themrcul
Thu Aug 29, 2019 3:16 am
Forum: Demos
Topic: WIP "Double Symbol" - release!
Replies: 9
Views: 2004

Re: WIP "Double Symbol" - release!

Great work Tim!
by themrcul
Tue Jul 16, 2019 12:51 am
Forum: Demos
Topic: MegaVid FMV codec
Replies: 3
Views: 811

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: 7775

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: 7775

Re: Cart Design Questions

3D render 2 (A side):
3D A.PNG
3D A.PNG (37.08 KiB) Viewed 938 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: 7775

Re: Cart Design Questions

1.8V net highlighted:
1.8V.PNG
1.8V.PNG (168.55 KiB) Viewed 938 times
1.2V net highlighted:
1.2V.PNG
1.2V.PNG (168.46 KiB) Viewed 938 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 938 times
by themrcul
Tue Jul 09, 2019 2:02 am
Forum: Megadrive/Genesis
Topic: Cart Design Questions
Replies: 45
Views: 7775

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: 662

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: 7775

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: 7775

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: 7775

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: 7775

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: 7775

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: 7775

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: 7775

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...