I planned to do a 3+1, like the 64 version, which would shorten the design by 3 inches.
Basically, I just need to know if there's more that needs to be considered before I run a proto.
Jim
Search found 531 matches
- Sun Apr 28, 2024 9:44 pm
- Forum: Buy, Sell, and Trade
- Topic: WTB: Cardco Cardboard 6
- Replies: 18
- Views: 7198
- Mon Apr 22, 2024 10:47 am
- Forum: Buy, Sell, and Trade
- Topic: WTB: Cardco Cardboard 6
- Replies: 18
- Views: 7198
- Sat Apr 20, 2024 11:45 pm
- Forum: Hardware and Tech
- Topic: Cart Expander connector spacing?
- Replies: 5
- Views: 2731
Re: Cart Expander connector spacing?
I still need to shift the ports to 1", but I went ahead and placed the original and new designs on github.com: https://github.com/go4retro/xpander-vic Thanks to Orangeman96 on the forum for prodding me to provide the files I've held off on shifting the ports, since the board is routed in two sp...
- Sat Apr 20, 2024 11:50 am
- Forum: Hardware and Tech
- Topic: Cart Expander connector spacing?
- Replies: 5
- Views: 2731
- Sat Apr 20, 2024 11:49 am
- Forum: Hardware and Tech
- Topic: Cart Expander connector spacing?
- Replies: 5
- Views: 2731
Re: Cart Expander connector spacing?
I'd recommend just passing [pins 20 and Y] through exactly like all other lines. There exist cartridges which misuse either pins 20 or Y on their edge connectors to simplify routing. If one cartridge connects 20 or Y to +5 V and one other cartridge connects the same pin to GND you short the power s...
- Fri Apr 19, 2024 2:12 pm
- Forum: Buy, Sell, and Trade
- Topic: WTB: Cardco Cardboard 6
- Replies: 18
- Views: 7198
Re: WTB: Cardco Cardboard 6
I wouldn't attempt to fit the largest available cartridges in it because of the extra cost involved - I have an 80 column cart that is about 2x the thickness of a standard one. People can always sacrifice one slot for something big like that. As long as the spacing is large enough to accommodate ca...
- Thu Apr 18, 2024 9:19 pm
- Forum: Hardware and Tech
- Topic: Cart Expander connector spacing?
- Replies: 5
- Views: 2731
Cart Expander connector spacing?
Revisiting my X-Pander 3 VIC design as I plan to get it up on Github and perhaps consider a re-run. It had bugs and I'd like to get them fixed before I put something into the wild. Is there a preferred port spacing? Also, as I recall, pin 20 and pin Y, though noted as N/C on many pinouts, were in ac...
- Thu Apr 18, 2024 11:56 am
- Forum: Buy, Sell, and Trade
- Topic: WTB: Cardco Cardboard 6
- Replies: 18
- Views: 7198
Re: WTB: Cardco Cardboard 6
As I remember Jim made 100 of these, but noticed the dip-switches were to close to the cartridge slots, so you could not plug in a standard cartrdige fully. You can still buy this for $22 a piece and I got one some years ago: https://store.go4retro.com/non-functional-goodies/ See the notes at the b...
- Tue May 25, 2021 10:13 pm
- Forum: Emulation and Cross Development
- Topic: libultimem for cc65 (C/asm)
- Replies: 9
- Views: 865
Re: libultimem for cc65 (C/asm)
Sorry I didn't see this earlier. It's very much appreciated!
Let me know how I can help get this working on real HW.
Jim
Let me know how I can help get this working on real HW.
Jim
- Sat Mar 27, 2021 12:06 am
- Forum: Hardware and Tech
- Topic: Question on serial port
- Replies: 2
- Views: 369
Re: Question on serial port
As the linked posting illustrates, the inverters are open collector, which is very important for the bus. You could somewhat accomplish the same thing by putting pullup resistors on all the VIA pins connected to the bus and switching the output to an input when you want to send a '1',, but the 6522 ...
- Wed Feb 24, 2021 2:01 pm
- Forum: Hardware and Tech
- Topic: My hardware project :: GCart 2011
- Replies: 154
- Views: 92534
Re: My hardware project :: GCart 2011
Does the ARM automatically connect to the DRAM and handle refresh, or do you implement your own refresh scheme?
Jim
Jim
- Mon Feb 22, 2021 11:44 am
- Forum: Hardware and Tech
- Topic: My hardware project :: GCart 2011
- Replies: 154
- Views: 92534
Re: My hardware project :: GCart 2011
Does the cart allow FLASH in any bank besides 5?
Jim
Jim
- Fri Feb 19, 2021 8:38 pm
- Forum: Hardware and Tech
- Topic: My hardware project :: GCart 2011
- Replies: 154
- Views: 92534
Re: My hardware project :: GCart 2011
I'd fix this by using an 29F040b, which only requires 12 bit unlock codes. It's still 512kB, and I believe it still available. That way, the unlock can be done from any bank.
And, I think they are less expensive that your current option.
Jim
And, I think they are less expensive that your current option.
Jim
- Sun Jan 24, 2021 1:13 am
- Forum: Hardware and Tech
- Topic: My hardware project :: GCart 2011
- Replies: 154
- Views: 92534
Re: My hardware project :: GCart 2011
Here's the repo for UltiMEM: https://github.com/go4retro/UltiMEM And, the register description is here: http://www.go4retro.com/products/ultimem/ Essentially, each of the various memory segments (RAM 1,2,3 | BLK1 | BLK2 | BLK3 | BLK5 | IO2 | IO3) can be set to read/write RAM, R/O RAM, ROM, or nothin...
- Mon Jan 18, 2021 10:53 pm
- Forum: Hardware and Tech
- Topic: My hardware project :: GCart 2011
- Replies: 154
- Views: 92534
Re: My hardware project :: GCart 2011
I'll put the UltiMEM schematics and such into github, as it sounds a lot like your current project (8MB FLASH, 1MB RAM, bankable blocks and rams and IO segments)
Jim
Jim