Search found 145 matches

by bmwtcu
18 Aug 2022, 05:22
Forum: Hardware and software hacking
Topic: Could a Propeller 2 make a good I/O controller for a modified Gigatron?
Replies: 7
Views: 1504

Re: Could a Propeller 2 make a good I/O controller for a modified Gigatron?

He got 64K with version 4 ROM and with 5A, he's getting 128K.
ROMv5a had a memory detection bug that would erroneously report 128K on my 64K FPGA.
by bmwtcu
13 Aug 2022, 07:12
Forum: Hardware and software hacking
Topic: Novatron
Replies: 36
Views: 6535

Re: Novatron

Nice!!! You should be able to split the PULSE and LATCH pins and use a switch to select between keyboard and controller DATA? I've never tried swapping mid-stream, so not sure if you can get away without a reset for some edge conditions. While I understand the tradeoff you made for the RAM expander ...
by bmwtcu
30 Jun 2022, 01:29
Forum: Hardware and software hacking
Topic: Gigatron Clone Ideas
Replies: 46
Views: 7302

Re: Gigatron Clone Ideas

Schweet! Fixed the FPGA code by adding if(cu_pl_n) to the PC increment. Tested on ROMv3/v4/vX0. (Love those DIP switches!)
by bmwtcu
29 Jun 2022, 02:21
Forum: Hardware and software hacking
Topic: Gigatron Clone Ideas
Replies: 46
Views: 7302

Re: Gigatron Clone Ideas

Sounds consistent with the two known failures we've been talking about.
by bmwtcu
28 Jun 2022, 15:47
Forum: Hardware and software hacking
Topic: Gigatron Clone Ideas
Replies: 46
Views: 7302

Re: Gigatron Clone Ideas

https://forum.gigatron.io/viewtopic.php?p=2301#p2301 Hmm... Looks like exactly the same thing. I haven't seen this myself, though I have had other strangeness happen specifically on ROMv3 Pictures when it showed Jupiter. Are Blinkenlights still running? I assume that you already received your Famico...
by bmwtcu
28 Jun 2022, 11:44
Forum: Hardware and software hacking
Topic: Would emulating vCPU on a Propeller 2 be feasible?
Replies: 10
Views: 2049

Re: Would emulating vCPU on a Propeller 2 be feasible?

I've been toying with that idea too. The 8 PIOs offload much of the serial data manipulation from the main dual core M0+. It's crazy when you think about how much processing power you get for $4.
by bmwtcu
28 Jun 2022, 01:05
Forum: Hardware and software hacking
Topic: Gigatron Clone Ideas
Replies: 46
Views: 7302

Re: Gigatron Clone Ideas

Congrats! I'm curious... what make/model RF modulator?
by bmwtcu
10 Jun 2022, 22:12
Forum: Hardware and software hacking
Topic: Gigatron Clone Ideas
Replies: 46
Views: 7302

Re: Gigatron Clone Ideas

The Gigatron avoids this issue by having a single OR-gate between the write enable and clock (U16A). The ~WE signal is one of the first to change from low to high and makes sure the write recovery (address change) happens after the write enable has ended. The ~WE I'm using goes through the GAL and ...
by bmwtcu
31 May 2022, 21:44
Forum: Escape Meta Alt Control Shift
Topic: Gigatron ASIC and the Gametron Handheld
Replies: 37
Views: 28295

Re: Gigatron ASIC and the Gametron Handheld

The 128Mbit Intel Strataflash between the FPGA and DIP switches stores multiple Gigatron ROM images. The board is laid out such that it can support up to a 256Mbit part that would give you 256 DIP switch selectable 64kx16 ROM images. The IDT SRAM is actually 256kx16 with high/low byte enables. I don...