Search found 10 matches

by Alan
Mon Feb 07, 2011 10:19 pm
Forum: Hardware
Topic: Using the /TIME line for more than bank switching?
Replies: 13
Views: 9346

Thanks again to all that helped.
Regards.
by Alan
Sat Feb 05, 2011 2:18 am
Forum: Hardware
Topic: Using the /TIME line for more than bank switching?
Replies: 13
Views: 9346

Hi, please could you take a few minutes to look over the small schematic I made. The top shows a 8bit latch attached to D0..7, and by checking !LWR and !TIME via a NOR gate will latch the data bus on writes to $A130xx. Results then displayed on LEDs. The bottom shows 8 lines that are controlled via ...
by Alan
Thu Feb 03, 2011 11:14 pm
Forum: Hardware
Topic: Using the /TIME line for more than bank switching?
Replies: 13
Views: 9346

Thanks for your replies guys, much better understanding now. What about when I need to read from my 'device' I must need to somehow put that data onto the data lines. What considerations should I take? Maybe the megadrive or my game ROM is already asserting the data lines. Is there a valid sequence ...
by Alan
Wed Feb 02, 2011 11:34 pm
Forum: Hardware
Topic: Using the /TIME line for more than bank switching?
Replies: 13
Views: 9346

Using the /TIME line for more than bank switching?

Hi all, Probably a simple question. How are you guys making cartridges that take advantage of SD cards, USB ports, etc? Is it just the /TIME line or are other lines required too? I assume you are doing something along the lines of seeing what address is on the bus when the /TIME line is toggled then...
by Alan
Sat Jan 22, 2011 10:59 pm
Forum: Hardware
Topic: New devcart
Replies: 34
Views: 18518

Charles MacDonald wrote:I wouldn't mind making and selling a few more of these once I work out what to change in the next version.
Estimated price with shipping to UK?
by Alan
Fri Jan 21, 2011 5:48 pm
Forum: Hardware
Topic: New devcart
Replies: 34
Views: 18518

Very interesting cart, well done.

How does the USB interface work? Are you using a serial UART to USB or implementing some sort of 'HID' device?
Do you have any plans to release schematics and such?

Regards.
by Alan
Mon Nov 15, 2010 9:30 pm
Forum: Demos
Topic: Sonic The Hedgehog Open Source Project
Replies: 8
Views: 24839

Looks very nice, will be sure to give it a go soon.

Also should you not already be a member I recommend you also post this over at Sonic Retro.
Should easily get you the tech level membership there.

Regards.
by Alan
Wed Nov 03, 2010 12:10 pm
Forum: Blabla
Topic: Devcart wishlist?
Replies: 42
Views: 11904

2- on my PC, there was a conflict with my modem ... you could achieve full speed USB2 on ATxx and not with FTDI That shouldn't of happened if 'they' used a different VIP/PID, FTDI supply them free of charge to anyone using their chips. However Atmel only give them out to bigger projects, no guarant...
by Alan
Mon Nov 01, 2010 7:43 pm
Forum: Blabla
Topic: Devcart wishlist?
Replies: 42
Views: 11904

I have used the FTDI chip before, really like it. Never had any problems with their D2XX drivers.
Also the support is very good, couple of times I have sent them emails and got replies within matter of hours.

Regards.
by Alan
Sun Oct 31, 2010 10:42 pm
Forum: Hardware
Topic: Megadrive pins while in reset
Replies: 1
Views: 3331

Megadrive pins while in reset

Hi all,

Does anybody know the state of the address, data and control lines of the megadrive while it is being held in reset (hard and/or soft).
I'm hoping they are tri-state but would like someone to confirm.

Regards.