Search found 28 matches

by Sugarplum
18 Sep 2021, 17:34
Forum: Hardware and software hacking
Topic: List of possible Gigatron mods
Replies: 14
Views: 3504

Re: List of possible Gigatron mods

I have more understanding of how the Gigatron works since I've started this thread. To be honest, the CPU portion doesn't need port opcodes at all. The 6502 didn't have them. More native opcodes, including shifts, registers, and memory modes, would have a higher priority to me. As for the ports, you...
by Sugarplum
31 Aug 2021, 07:09
Forum: Hardware and software hacking
Topic: Fitting a screen inside the wooden box
Replies: 11
Views: 7130

Re: Fitting a screen inside the wooden box

And if someone could make a keyboard to fit in a similar box...
by Sugarplum
31 Aug 2021, 05:03
Forum: Escape Meta Alt Control Shift
Topic: Gigatron Similar machine
Replies: 2
Views: 184

Re: Gigatron Similar machine

Thanks, Walter. I do have a project page there. I'm doing more sharing than looking for advice. I tried on AnyCPU, but I find I don't fit with that crowd. Yet, my project seems to be beyond the intended scope here. Below is the logic as to how I got to this point in what I'd like to build. The chall...
by Sugarplum
28 Aug 2021, 14:46
Forum: Escape Meta Alt Control Shift
Topic: Gigatron Similar machine
Replies: 2
Views: 184

Gigatron Similar machine

I've wondered, if I were to make my design, if I even want to copy the vCPU or memory locations. On one hand, I could do things differently and make use of special features. But then there is the other problem, of needing to create a toolchain and software environment. What does everyone think? One ...
by Sugarplum
28 Aug 2021, 07:17
Forum: Hardware and software hacking
Topic: Double your RAM:
Replies: 12
Views: 8022

Re: Double your RAM:

That's a neat way to do that.
by Sugarplum
02 Aug 2021, 22:01
Forum: Escape Meta Alt Control Shift
Topic: Suggestions/ideas for my possible Gigatron-similar machine?
Replies: 1
Views: 270

Re: Suggestions/ideas for my possible Gigatron-similar machine

Another idea comes to mind. What if there were a way to drive the ALU (and possibly the CU) at twice the main frequency? Then that could allow up to 4 native instructions (assuming multiple ALUs). That could allow hardware blitting and 16-bit ops (due to having 2 RAM cycles per ROM cycle). That woul...
by Sugarplum
25 Jul 2021, 22:38
Forum: Escape Meta Alt Control Shift
Topic: Suggestions/ideas for my possible Gigatron-similar machine?
Replies: 1
Views: 270

Suggestions/ideas for my possible Gigatron-similar machine?

I still haven't started my Verilog CPU project. I'd like to make something that can run vCPU code, but with a different architecture. I'm looking for comments on various aspects or any considerations. Separation of video/sound/keyboard using DMA -- This will use the redirection table for the video. ...
by Sugarplum
03 Jun 2021, 19:23
Forum: Hardware and software hacking
Topic: Gigatron on an FPGA
Replies: 10
Views: 5042

Re: Gigatron on an FPGA

The image above shows this bug with all the spikes in the image around all horizontal edges. I am not sure if the double-buffering is the cause since the original design was made to work with HDMI.
by Sugarplum
25 May 2021, 21:33
Forum: Hardware and software hacking
Topic: 10MHz, 12.5MHz and Beyond!
Replies: 35
Views: 19388

Re: 10MHz, 12.5MHz and Beyond!

To go beyond a little past 12 Mhz, that is where you start to rethink other things. Redesigning the ALU to use a carry-skip adder configuration would likely help because that would allow both carry possibilities to be calculated at the same time with a minor switching delay rather than calculating t...
by Sugarplum
22 May 2021, 02:07
Forum: Hardware and software hacking
Topic: Possible ways of speeding up the Gigatron
Replies: 32
Views: 3534

Re: Possible ways of speeding up the Gigatron

Going that far, if one wants to merge the repeater board and the I/O board, one might as well boost the ALU speed too. The adders are right below the repeater, and the high adder is the one I'd replace with a reduced latency adder board. You can use 2 adders and a multiplexer in place of the upper a...