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#61
Re: Project VBoot
Posted on: 2010/9/27 20:50
VUE(xpert)
Joined 2010/2/14
USA
333 Posts
10+ Game RatingsLong Time User (9 Years)
Mini-update
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#62
Re: Project VBoot
Posted on: 2010/10/9 0:44
Newbie
Joined 2010/10/8
4 Posts
Long Time User (9 Years)
Lookin' good. You, my friend, are awesome.
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#63
Re: Project VBoot
Posted on: 2010/10/10 2:36
VUE(xpert)
Joined 2010/2/14
USA
333 Posts
10+ Game RatingsLong Time User (9 Years)
New update!

And pic!!!!

Open in new window
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#64
Re: Project VBoot
Posted on: 2010/10/27 9:09
VUE(xpert)
Joined 2007/7/28
Great Britain
336 Posts
Long Time User (12 Years) App Coder
How's it going ?
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#65
Re: Project VBoot
Posted on: 2010/10/28 2:56
VUE(xpert)
Joined 2010/2/14
USA
333 Posts
10+ Game RatingsLong Time User (9 Years)
This board has been pretty quiet lately so I didn't think to do an update. Basically I just had two weeks of straight midterms which took a toll on me mentally. And I had a major hard drive failure and had to spend a lot of time recovering data, but it looks like I managed to recover all of my Project VBoot stuff.

As for the boards, I started assembling and discovered one problem right away - the footprint for the bus tranceiver is too narrow, so I will have to fix that. That's what I get from using that footprint from a manufacturer instead of making it from scratch like the others. I will still be able to do board debugging, I just won't have VB connectivity on these first boards which is fine. I figured I would have to make a revision anyway, so once I finish getting all my programs re-installed I will start back in fixing the board problems and debugging the memory. All in all this is probably one of the biggest crunches of the semester for me so sorry for the lack of updates.
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#66
Re: Project VBoot
Posted on: 2011/1/28 13:06
PVB Elite
Joined 2010/1/5
Sweden
560 Posts
Long Time User (9 Years) Donator30+ Game Ratings
I just heard about this, has anything else happened, any progress, a working prototype?

Those 2mm x 2mm connectors needs to be adjusted to fit properly, I had used one of those for my homemade eprom board. If the connector parts aren't adjusted a little with a pin they loose connection very easily I also recall having to sand down the sides of it a little to fit in the slot. Furthermore the plastic part is shorter than an original connector so it won't go into the slot properly unless you have an extension on the PCB that lengthens the connector piece a little.

I had a post somewhere here... *looking*

Here:
http://www.planetvb.com/modules/newbb ... ost_id=9727#forumpost9727

Had to add 2mm or so, so that the board wouldn't stop the connector from going all the way in. It increases the chance of a good connection than if only part of the pins in the mating connector is inserted.



I noticed the other day that Richard H. had started selling microSD card Vectrex cartridges so I had hoped to see some thread about a finished "FlashBoy Plus SD" or something like that... Seems like there wasn't much point in making one if this project gets finished.
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#67
Re: Project VBoot
Posted on: 2011/1/30 0:48
VUE(xpert)
Joined 2010/2/14
USA
333 Posts
10+ Game RatingsLong Time User (9 Years)
I know people won't want to hear it but development has been more or less halted because of personal stuff. And then last week I broke my wrist and had surgery so now it takes me forever to do anything on the computer. I haven't given up on this project though.

Also, the connectors I have seem to fit snugly in the VB with no modifications. I have used other ones that I had to shave down with a dremel.
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#68
Re: Project VBoot
Posted on: 2011/1/31 15:13
VUE(xpert)
Joined 2010/2/14
USA
333 Posts
10+ Game RatingsLong Time User (9 Years)
A little more of an update... I had a hard drive crash a few months ago but I was able to recover almost all of my VB work. On my first run of boards I had a problem with some of the package sizes so I had to make a new rev of the board. The new rev needs about 4-5 hours of tweaking before I send it out. In the mean time, I've gotten a notice from digikey that one of my critical parts is going obsolete, so I haven't figured out what I'm going to do with that yet. I have a small stock of them so I'm planning to power through the prototype/debug stage and then dealing with that later once I have a proof of concept working. It's also possible my ideas won't work on the VB (it is an old design, after all) so I might have to scrap my design and redo it on an FPGA. I hope it doesn't get to that point, my FPGA skills are rusty. :P

The other problem I have is due to my broken wrist, I can't solder, or even hold the iron very well. So unless I can find someone that can match my SMT solder skills and wants to work for free, I may have to wait. Ugh, this stupid wrist is turning into a nightmare.
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#69
Re: Project VBoot
Posted on: 2011/2/18 21:27
PVB Elite
Joined 2010/1/5
Sweden
560 Posts
Long Time User (9 Years) Donator30+ Game Ratings
Perhaps you can find this soon to be obsolete part somewhere else?
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#70
Re: Project VBoot
Posted on: 2011/2/20 2:30
VUE(xpert)
Joined 2010/2/14
USA
333 Posts
10+ Game RatingsLong Time User (9 Years)
The part that I am talking about is the bus transceiver/level shifter. I couldn't find many other chips that did the same thing and could shift levels between 3 and 5V. However, I've been reading a bunch of application notes and I should be able to directly interface 3.3V and 5V logic if I use a small (150R) current limiting resistor to protect the micro. The VB will be fine because I can drive 5V logic with 3.3V. I still need a bus transceiver because I need to be able to share the bus between the VB, micro, and two SRAMs. But those parts are much more common, so a small redesign should fix this issue and make it more future-proof.

I can already tell that this board is going to have to be larger than the size of a VB cartridge, unless I go to a 4-layer board, which will cost a lot more. I would rather stay with the 2-layer design and just make it a longer board.
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