Search found 17 matches

by daybyter
Sat May 26, 2018 6:43 pm
Forum: Hardware
Topic: Little Project: GAL/SPLD programmer
Replies: 9
Views: 2086

Re: Little Project: GAL/SPLD programmer

If you don't want to go the diy route, the tl866cs seems to be the most cost-effective solution?
by daybyter
Fri May 25, 2018 7:36 pm
Forum: Hardware
Topic: Little Project: GAL/SPLD programmer
Replies: 9
Views: 2086

Re: Little Project: GAL/SPLD programmer

Uh...maybe there is some misunderstanding. I do not want replace a GAL by an Arduino. I just want to program the logic chip with the Arduino. Transfer the data via USB from PC go Arduino and then let the Arduino program the logic IC.
by daybyter
Thu May 24, 2018 2:14 am
Forum: Hardware
Topic: Little Project: GAL/SPLD programmer
Replies: 9
Views: 2086

Re: Little Project: GAL/SPLD programmer

Interesting argument. I'm working on a eprom writer (struggling with too many distractions, though), and I've never thought about this problem. A 16 MHz 328 Arduino seems to be faster than a parallel connection, I thought? And if it was too slow, just use a stm32?
by daybyter
Wed May 23, 2018 7:35 pm
Forum: Hardware
Topic: Little Project: GAL/SPLD programmer
Replies: 9
Views: 2086

Re: Little Project: GAL/SPLD programmer

I do understand, that you want to minimize the number of complex IC's, but I also think that an Arduino plus step-up leads to an overall simpler design?
by daybyter
Mon May 14, 2018 4:50 am
Forum: Hardware
Topic: 28C64 in 2364 socket (28 pin to 26 pin)
Replies: 10
Views: 2624

Re: 28C64 in 2364 socket (28 pin to 26 pin)

Could you sand the black plastic spacers a bit shorter and then cut the pins by 1 or 2 millimeter? With a dremel and diamond disc maybe?
by daybyter
Sat Feb 03, 2018 3:07 am
Forum: Hardware
Topic: Improving Timex/Sinclair Tape Loading
Replies: 153
Views: 43205

Re: Improving Timex/Sinclair Tape Loading

http://www.stm32duino.com/viewtopic.php?t=107 The hantek 6022be /bl scopes are also an option. I think one of those salae clones + sigrok might also be better than your probe: https://m.ebay.com/itm/24MHz-8CH-USB-Logic-Analyzer-24MHz-8-Channel-Compatible-to-Saleae-ARM-FPGA-M100/272337085235?hash=ite...
by daybyter
Sat Oct 21, 2017 5:23 am
Forum: Hardware
Topic: What is the going price to have EPROMs burnt?
Replies: 42
Views: 8724

Re: What is the going price to have EPROMs burnt?

Just just want a cheap way to burn a 25 V eprom? I have a schematic for a Arduino based solution, although it still needs some testing.

http://www.ltspiceusers.ch/showthread.php?t=261
by daybyter
Wed Sep 27, 2017 4:51 am
Forum: Development
Topic: Explain this behavior
Replies: 14
Views: 3746

Re: Explain this behavior

Very cool! I like C and the zx81in general, so I appreciate your efforts.

First optimization, that caught my eye was this *(screen+i)= ...

Why not *screen++ = ... ?
by daybyter
Tue Sep 19, 2017 12:04 am
Forum: Hardware
Topic: Create ULA for €5?
Replies: 84
Views: 16383

Re: Create ULA for €5?

Was this board already posted? http://gnarlygrey.atspace.cc/development-platform.html#upduino It's a nice small form factor board with 5k LE and even quite some ram. It's not 5$ , but 8$ is not _that_ much more. No clue, if the IO pins are where they are needed, but an adapter socket might fix this ...
by daybyter
Fri May 12, 2017 11:43 pm
Forum: Hardware
Topic: Create ULA for €5?
Replies: 84
Views: 16383

Re: Create ULA for €5?

So who is good at eagle or KiCad?