Search found 21 matches

by Sugarplum
19 Nov 2020, 16:57
Forum: Hardware and software hacking
Topic: List of possible Gigatron mods
Replies: 13
Views: 2528

Re: List of possible Gigatron mods

Yes, finding ways to hack older hardware is fun. The 6502 had "illegal opcodes" that many coders would use. It's neat what add-ons folks are making for the Atari machines. Someone had made a driver for running a parallel printer on an Atari 800 using the joystick ports. Someone even managed to write...
by Sugarplum
19 Nov 2020, 12:34
Forum: Kit assembly gallery
Topic: My Gigatron! It very almost works! (Help!)
Replies: 7
Views: 1647

Re: My Gigatron! It very almost works! (Help!)

I would try attaching a Famicon controller and seeing if it works as expected. If not, then you might want to check the wiring around the port and the resistors on the Gigatron side. But if that does work fine, then it could be your Pluggy or your keyboard. You might find some assistance by looking ...
by Sugarplum
19 Nov 2020, 12:10
Forum: Hardware and software hacking
Topic: List of possible Gigatron mods
Replies: 13
Views: 2528

Re: List of possible Gigatron mods

Thanks! I added to it over several days. I don't know how many I will implement once I get ready to implement it in FPGA. It seems that I'm thinking of making it more as an Asymmetric Multiprocessor (AMP as opposed to SMP) APU and mostly a SOC design. I could see someone like David Murray ("The 8-bi...
by Sugarplum
18 Nov 2020, 19:36
Forum: Hardware and software hacking
Topic: List of possible Gigatron mods
Replies: 13
Views: 2528

List of possible Gigatron mods

Here is a list of as many possible Gigatron modifications I can see. Keep in mind that this list is only to give ideas and inspire creativity. Nothing said here is to be taken as a criticism of the platform. The Gigatron is already beautiful as it is. Opcode Mods Add more memory addressing modes -- ...
by Sugarplum
17 Nov 2020, 18:53
Forum: Escape Meta Alt Control Shift
Topic: Gigatrons and Education
Replies: 1
Views: 650

Re: Gigatrons and Education

I've learned a lot by studying the Gigatron over the past year even though I haven't built one or owned one yet. As I've played with ways to mod it in my mind, I've learned more about why various decisions were made. I've asked myself many questions such as, "If I change how this is done, what would...
by Sugarplum
17 Nov 2020, 17:52
Forum: Hardware and software hacking
Topic: 10MHz, 12.5MHz and Beyond!
Replies: 33
Views: 16369

Re: 10MHz, 12.5MHz and Beyond!

Yes, the Gigatron is marvelous as it is. And I think the term for the adder mod would be a carry select adder. If one is going for an optimized 4-layer PCB and possibly SMT parts, I think the carry select design would help push for a higher clock rate or improve stability at higher frequencies. If o...
by Sugarplum
12 Nov 2020, 13:20
Forum: Escape Meta Alt Control Shift
Topic: RCA 1802
Replies: 2
Views: 674

RCA 1802

I started studying the RCA 1802 . I am pretty sure the Gigatron can outrun it, even in vCPU mode. It was a somewhat odd CPU. It uses 8 clock cycles in a machine cycle, and instructions take 2-3 machine cycles. That means it takes 16-24 clock cycles per instruction. The instruction length is 1-3 byte...
by Sugarplum
03 Nov 2020, 22:12
Forum: Escape Meta Alt Control Shift
Topic: Gigatron ASIC and the Gametron Handheld
Replies: 28
Views: 6845

Re: Gigatron ASIC?!?

Actually, ASIC costs are coming down. They now can do smaller orders by putting different products on the same wafer. I, myself have considered coming up with an advanced Gigatron (on FPGA) with hardware video and a framebuffer, maybe a hardware PSG, maybe a programmable light sequencer that can be ...
by Sugarplum
03 Nov 2020, 21:42
Forum: Hardware and software hacking
Topic: A sprite editor?
Replies: 2
Views: 727

Re: A sprite editor?

I am not sure, but I think others are using Photoshop, reducing the palette, maybe exporting as RAW, and maybe taking a hex editor or something to dump in the values.
by Sugarplum
11 Oct 2020, 06:14
Forum: Hardware and software hacking
Topic: 80 Column Mode and high speed serial?
Replies: 3
Views: 1436

Re: 80 Column Mode and high speed serial?

That sounds like a good idea for this type of implementation. It would be nice to have a way to switch modes and to remap the color signals to where you can keep the D/A converter as it is, but output it as green/amber/white. Yeah, that could be a nice setup for a DOS-like (or CPM-like) OS and be go...