Open Source FPGA Expansion Card for the Apple II
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Open Source FPGA Expansion Card for the Apple II
1–10 of 18 posts
Re: Open Source FPGA Expansion Card for the Apple II
#2YouTube interview with creators: https://www.youtube.com/watch?v=gJXZZJZc5gI
Re: Open Source FPGA Expansion Card for the Apple II
#3GitHub repo here - https://github.com/a2fpga/a2fpga_core/
Re: Open Source FPGA Expansion Card for the Apple II
#4If you are as curious as I were what the card looks like, then have a look at this:
https://github.com/a2fpga/a2fpga_core/blob/main/boards/a2n20...
I always find it impressive how integrated our electronics have become and how few components are required to achieve what would have taken large, crowded PCBs in the past.
Re: Open Source FPGA Expansion Card for the Apple II
#5If you program the FPGA with an Apple ][ emulator, can we call it a HyperCard?
Re: Open Source FPGA Expansion Card for the Apple II
#6If you are as curious as I were what the card looks like, then have a look at this: https://github.com/a2fpga/a2fpga_core/blob/main/boards/a2n20... I always find it impressive how integrated our electronics have become and how few components are required to achieve what would have taken large, crowded PCBs in the past.
Project co-creator here - that's actually the V1 board, the V2 board is here https://github.com/a2fpga/a2fpga_core/blob/main/boards/a2n20... and uses a slightly larger CPLD (complex programmable logic device) which is what's used to map and level shift the 5V signals from the Apple II bus to the 3.3V pins on the FPGA module. We use the Sipeed Tang Nano 20K FPGA module for the FPGA. Using a pre-built module like this is a great accelerator in this type of project because a lot of the more complicated things to get right, like the power supplies or the length of the traces for the HDMI connector, are done for you.
Re: Open Source FPGA Expansion Card for the Apple II
#7once again i regret my decision to get an apple //c for my collection rather than the more expandable apple ][ or //e. in my defense, it just looks so cute!
Re: Open Source FPGA Expansion Card for the Apple II
#8If you are as curious as I were what the card looks like, then have a look at this: https://github.com/a2fpga/a2fpga_core/blob/main/boards/a2n20... I always find it impressive how integrated our electronics have become and how few components are required to achieve what would have taken large, crowded PCBs in the past.
Yep. I've been looking at an old arcade board's design for fun lately, and it's a lot of giant (for today's standards) DIP chips that are just flip-flops, and gates, or gates, which modern cheap FPGAs have by the tens or hundreds of thousands in them.
Re: Open Source FPGA Expansion Card for the Apple II
#9720x480 is not 720p, that's 480p (assuming progressive scan and not interlaced).
Re: Open Source FPGA Expansion Card for the Apple II
#10720x480 is not 720p, that's 480p (assuming progressive scan and not interlaced).
Good catch, that's a mistake that's now been corrected, it's definitely 480p. The Github page (https://github.com/a2fpga/a2fpga_core) had it correctly.