Search found 145 matches

by bmwtcu
30 May 2022, 14:22
Forum: Escape Meta Alt Control Shift
Topic: Gigatron ASIC and the Gametron Handheld
Replies: 37
Views: 28083

Re: Gigatron ASIC and the Gametron Handheld

Just to document the month long effort before I disassemble it for parts. This was my initial attempt at prototyping with the Spartan 2 FPGA. (The SRAM has already been salvaged, and was probably why the proto never worked.) I only verified the proto as far as reading instructions from the OTP EPROM...
by bmwtcu
28 May 2022, 01:56
Forum: Escape Meta Alt Control Shift
Topic: Gigatron ASIC and the Gametron Handheld
Replies: 37
Views: 28083

Re: Gigatron ASIC and the Gametron Handheld

https://www.youtube.com/watch?v=G1rcSN7yz0w Gametron playlist - https://www.youtube.com/playlist?list=PLlJwE3GCs9hfzwddUltOnaqqG0CLZiLjt When life gives you component shortages, you start designing with parts you've been hoarding for the last 2 decades! Board has jumpers to select 4/6/8-bit audio DA...
by bmwtcu
17 May 2022, 16:03
Forum: Hardware and software hacking
Topic: Gigatron Clone Ideas
Replies: 46
Views: 7232

Re: Gigatron Clone Ideas

alastair wrote: 14 May 2022, 03:45 ...the only real change are the PALs. These can be reprogrammed...
Very cool! I've only used GALs (which are reprogrammable) before, but I thought that PALs were OTP?
by bmwtcu
14 May 2022, 21:35
Forum: Hardware and software hacking
Topic: Memory detection
Replies: 12
Views: 2225

Re: Memory detection

lb3361 wrote: 12 May 2022, 22:35 But it would be useful to know whether they work on all Gigatrons, including those that use nonstandard chips, etc.
Confirmed to work with Xilinx Spartan 6 LX25, which definitely qualifies as nonstandard. (Running SDROM/v5a)
WhatsApp Image 2022-05-14 at 5.32.39 PM.jpeg
WhatsApp Image 2022-05-14 at 5.32.39 PM.jpeg (387.27 KiB) Viewed 1311 times
by bmwtcu
08 May 2022, 02:12
Forum: Hardware and software hacking
Topic: my Gigatron RAM and IO expansion does not work
Replies: 37
Views: 4667

Re: my Gigatron RAM and IO expansion does not work

AFAIK, nobody has worked on a 12.5MHz compatible ROM beyond v3y.
by bmwtcu
05 May 2022, 09:18
Forum: Hardware and software hacking
Topic: my Gigatron RAM and IO expansion does not work
Replies: 37
Views: 4667

Re: my Gigatron RAM and IO expansion does not work

Maybe I'm misunderstanding your question, but you should be able to program any Babelfish version that includes Arduino Uno Loader support (which I suspect means all versions). You need python 3.x though. Marcel had updated Babelfish but didn't get the chance to update that page. Pluggy Reloaded sho...
by bmwtcu
04 May 2022, 16:13
Forum: Hardware and software hacking
Topic: Gigatron Clone Ideas
Replies: 46
Views: 7232

Re: Gigatron Clone Ideas

Is 5V x16 flash/EEPROM a viable option? I know more folks with PROM programmers than UV erasers these days:P
by bmwtcu
04 May 2022, 02:45
Forum: Hardware and software hacking
Topic: Lies, Damned Lies and Benchmarks.
Replies: 27
Views: 5853

Re: Lies, Damned Lies and Benchmarks.

Nice! Where do I read about Mode 1975?
by bmwtcu
03 May 2022, 23:33
Forum: Hardware and software hacking
Topic: my Gigatron RAM and IO expansion does not work
Replies: 37
Views: 4667

Re: my Gigatron RAM and IO expansion does not work

Any chance you might have a spare GAL to reprogram GAL2 to rule out a bad part? (Not sure if you used the same GAL2 part to test both boards.) Did you already verify soldering on pin 21 of GAL2 and pin 17 of U4? If you do a continuity test with no power applied, is pin 21 shorted to GND? Can your PR...
by bmwtcu
03 May 2022, 23:15
Forum: Hardware and software hacking
Topic: Gigatron Clone Ideas
Replies: 46
Views: 7232

Re: Gigatron Clone Ideas

https://forum.gigatron.io/viewtopic.php?p=2948#p2948 25MHz oscillator with jumper selectable /1,/2 and /4 clock options using 74LS74. If you're doing the PALs/GALs already, does it make sense to integrate the SPI/RAM Expander vs Pluggy Reloaded? https://github.com/lb3361/gigatron-lb/tree/main/extens...