Search found 40 matches

by steve
18 Jul 2020, 21:02
Forum: Hardware and software hacking
Topic: vCPU instruction frequency
Replies: 5
Views: 952

vCPU instruction frequency

For the people interested I did an evaluation of vCPU instruction frequency. Following is the output after a session on PucMon :) tic hex count vInstr % cum. description 18 1A 1770982 LD 17% 17% Load byte from zero page (vAC=[D]) 28 35 1340049 BCC 13% 30% Test vAC and branch conditionally. CC can be...
by steve
13 Jul 2020, 12:32
Forum: Hardware and software hacking
Topic: PucMon
Replies: 23
Views: 4442

Re: PucMon

Well spotted, it's probably the main difference between the original ghost AI's and my implementation, but there are many others as well :) Originally I was aiming to implement the ghost AI perfectly, (even the overflow in tracking that causes the ghost targets to offset to the left and top), but I...
by steve
11 Jul 2020, 16:29
Forum: Hardware and software hacking
Topic: Importing in Kicad 5
Replies: 6
Views: 1284

Re: Importing in Kicad 5

It worked for me, too, and passes the electrical rules check. A couple of spot checks look fine, too. I'm now in the process of adding Marcel's I/O and RAM expander to the schematics, and then to the main board layout, along with a few other minor changes (reposition the EPROM to allow enough space...
by steve
11 Jul 2020, 15:48
Forum: Hardware and software hacking
Topic: PucMon
Replies: 23
Views: 4442

Re: PucMon

Dear "at67", you really - really - did a GREAT work: I've seen the emulator, then the basic compiler and ... this application that I think is the nicest one so far on Gigatron!!! Regarding the implementation I've seen you've followed some nice guide for the AI, anyway if you didn't see there is also...
by steve
11 Jul 2020, 14:51
Forum: Escape Meta Alt Control Shift
Topic: In memoriam Marcel
Replies: 16
Views: 5105

Re: In memoriam Marcel

I add myself to all the people that are extremely sorry for this very sad news.
We lost a great person and a superb hacker.
Hope he rest in peace wherever he is or having godd time continuing hacking in another dimension.
A greeting with a lot of respect Marcel.
See you.
by steve
27 Aug 2019, 16:40
Forum: Hardware and software hacking
Topic: Simulation software
Replies: 8
Views: 2360

Re: Simulation software

Got the point even if the last sentence is a bit scary for the testing I've to perform for the new ideas... I've almost finalized the reasonings and hope to be able to publish the results in the short time. Hope then you'll find them interesting enough to support me a bit in the realization!... In t...
by steve
27 Aug 2019, 12:57
Forum: Hardware and software hacking
Topic: Simulation software
Replies: 8
Views: 2360

Re: Simulation software

Seems to me that 8x4 matrix as it is available with current lines is not suitable for direct keycode wiring, anyway this is a simple lookup of a very low frequent event. Instead I was trying to understand another thing (and sorry if the question is trivial but I'm pretty new on electronics): I red a...
by steve
11 Jul 2019, 17:06
Forum: Hardware and software hacking
Topic: Simulation software
Replies: 8
Views: 2360

Re: Simulation software

Yes, I saw, but unfortunately this is adding even more circuits, even if external... (and added also to the one in the keyboard itself!) For me to remain pure with the 70s philosophy the keyboard should be a very simple integrated old school matrix one! The solution I was thinking was routing the (4...
by steve
10 Jul 2019, 17:27
Forum: Hardware and software hacking
Topic: Simulation software
Replies: 8
Views: 2360

Re: Simulation software

Welcome to the club! Thank you!! You're really nice and let me feel feel already part of a vibrant even if niche community!! :) The Gigatron design is easy to expand, because so much was stripped away from it :D Some links to interesting earlier proposals: tocksin's: https://forum.gigatron.io/viewt...
by steve
08 Jul 2019, 22:21
Forum: Hardware and software hacking
Topic: Simulation software
Replies: 8
Views: 2360

Simulation software

Hello Marcel and all the "co" Tech aficionados! I watched by chance a youtube video about Gigatron and started get interested about homebrew CPU design! :) I analyzed the project and found very nicely designed and explained. I also proposed (on the hackaday blog) an exctension of the instruction set...