Search found 97 matches

by Budgie
Wed Jan 29, 2020 10:21 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 533
Views: 41522

Re: Proposed: "The Ultimate Electron Upgrade"

No problem Dave. Looks like the meeting went well looking at the photos.
by Budgie
Sat Jan 25, 2020 10:44 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 533
Views: 41522

Re: Proposed: "The Ultimate Electron Upgrade"

Just spent some time looking at the kicad layout for your board and can’t believe the detail and amount of work that’s gone into it. I’m not surprised it took months of work.

Hats of to you
by Budgie
Sat Jan 25, 2020 10:39 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 533
Views: 41522

Re: Proposed: "The Ultimate Electron Upgrade"

Great thanks. All pins found now.
by Budgie
Sat Jan 25, 2020 8:06 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 533
Views: 41522

Re: Proposed: "The Ultimate Electron Upgrade"

Question for Dave H please Do you by any change have a full pin layout for the Electron ULA. I know you posted this earlier but some of the pins are missing off the image. I pretty much have them all but want to be sure all are correct. Many of the Pins on Myelin's layout are labelled 3.3V but uncon...
by Budgie
Wed Jan 22, 2020 8:44 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 533
Views: 41522

Re: Proposed: "The Ultimate Electron Upgrade"

I've PMed you about the board and would love to have a go but this would be my first go at reflow work so unlikely to end well but always happy to try. Thanks for the feedback on the buffer chips and the use of the XC95144XL as one. A shame about the TI part becoming obsolete. Always chasing our tai...
by Budgie
Sun Jan 19, 2020 4:11 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 533
Views: 41522

Re: Proposed: "The Ultimate Electron Upgrade"

I am very interested in this project and have been watching along for a good while. I'm looking to play around with this and perhaps try making a board myself. Would it be possible to use a Xilinx XC95144XL CPLD as a level shifter ? It would provide about 40 pins, so would not be enough if I wanted ...
by Budgie
Sat Nov 02, 2019 7:38 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 533
Views: 41522

Re: Proposed: "The Ultimate Electron Upgrade"

Awesome work and skill !! Well done
by Budgie
Fri Oct 04, 2019 8:28 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 877
Views: 73036

Re: ICE T65/Z80/6809

Great that we now have alternatives to the GODIL and the fact they now work with the Speccy. Will be really useful to be able to play with 5V tolerant 6502 and Z80 in FPGAs. I've produced a couple of boards for the RC2014 using a Xilinx XC95144XL and MACHXO2 FPGAs, to recreate a Speccy but these wil...
by Budgie
Wed Sep 18, 2019 9:19 pm
Forum: hardware
Topic: Beeb 1MHz Bus FPGA Adaptor
Replies: 149
Views: 8252

Re: Beeb 1MHz Bus FPGA Adaptor

Elminster wrote:
Wed Sep 18, 2019 8:49 pm
Is this the SID in the ATOM FPGA, is there some thoughts it doesn't sound like the real one?


No purely curious on how accurate it is to the original. This is the first time I have ever played anything from the BeebSID
by Budgie
Wed Sep 18, 2019 7:52 pm
Forum: hardware
Topic: Beeb 1MHz Bus FPGA Adaptor
Replies: 149
Views: 8252

Re: Beeb 1MHz Bus FPGA Adaptor

I too have finally got round to building mine. Really useful board. Thank you Dave for creating this. Great for standalone use and for interfacing to the Beeb and Master. Thanks to the Wiki and Dave's comprehensive instructions all was very easy to build ! In terms of the SID in the ATOM is this exa...
by Budgie
Tue Apr 02, 2019 9:01 pm
Forum: hardware
Topic: 5.25" Floppy drive problems
Replies: 11
Views: 810

Re: 5.25" Floppy drive problems

Pretty sure I had this exact error with a 5/4 drive connected to a Beeb. It turned out to be dirty heads. It took a lot of hard cleaning with isopropyl. Hope that helps
by Budgie
Mon Mar 04, 2019 3:47 pm
Forum: hardware
Topic: FreeFi-232 v2
Replies: 137
Views: 8618

Re: FreeFi-232 v2

Thanks. PM Sent.
by Budgie
Sun Mar 03, 2019 10:35 pm
Forum: hardware
Topic: FreeFi-232 v2
Replies: 137
Views: 8618

Re: FreeFi-232 v2

Does anybody have any of the latest version bare boards for sale by any chance ?

Thanks

Andy
by Budgie
Thu Jan 24, 2019 4:45 pm
Forum: hardware
Topic: Retro Hardware in FPGA's
Replies: 13
Views: 1103

Re: Retro Hardware in FPGA's

I’m using a few solutions 1. ULA board designed to fit the RC2014 solution. This board uses a Xilinx XC95144XL CPLD 2. The Nebula ULA board from Retroleum which I’ve reprogrammed with my version of the Zx spectrum ULA for learning purposes. Again a XC95144XL. This board replaces the ULA chip directl...
by Budgie
Tue Jan 22, 2019 12:45 pm
Forum: hardware
Topic: Retro Hardware in FPGA's
Replies: 13
Views: 1103

Re: Retro Hardware in FPGA's

Really interesting feedback Myelin. It’s the type of conclusions I have been coming to but without any 2nd opinions so really helpful

Thanks again

Andy
by Budgie
Sun Jan 20, 2019 10:35 am
Forum: hardware
Topic: Retro Hardware in FPGA's
Replies: 13
Views: 1103

Re: Retro Hardware in FPGA's

Thanks guys

Feedback greatly appreciated.
by Budgie
Sun Jan 20, 2019 10:01 am
Forum: hardware
Topic: Retro Hardware in FPGA's
Replies: 13
Views: 1103

Re: Retro Hardware in FPGA's

Many thanks for the quick replies. So is there a reason when recreating certain retro hardware where you may need to use these techniques or can they always be worked around with other techniques. If so what ? As an example I've been working on the ZX Spectrum ULA design on Opencores https://opencor...
by Budgie
Sat Jan 19, 2019 8:11 pm
Forum: hardware
Topic: Retro Hardware in FPGA's
Replies: 13
Views: 1103

Retro Hardware in FPGA's

Hi All, Hopefully its okay to post this question here. I've tried many other forums but never received a decisive answer. My question is this. When writing logic for FPGA's the best practice guides always say never:- 1. Use clock gating 2. Never use a normal combinatorial signal as a clock 3. Never ...
by Budgie
Sat Jul 21, 2018 8:46 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

Okay so here's mine. Works flawlessly so far.

The first 4 images are from the BBC micro. The last 2 are from an issue 6 Electron. The TV resolution is 1920 x 1080 50Hz

Just realised I didn't set Elk=1 in cmdline but it seems to be fine ?
by Budgie
Thu Jul 19, 2018 12:31 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

Missed mine. Stuck at the post office, will grab it tomorrow. Thanks Dave
by Budgie
Wed Jul 18, 2018 10:13 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

Looking forward to the delivery. You are a one man industry Dave. Hardware, software and documentation to a very high standard. Great product to boot !!
by Budgie
Sat Jul 14, 2018 6:44 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

Mine is also 1920x1080. I have a few though so can test a number of options possibly. I think they are all 1080p so may all be the same !
by Budgie
Thu Jul 12, 2018 4:10 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

Very efficient. You can’t beat them Hakos, I have the older analogue control one.
by Budgie
Wed Jul 11, 2018 4:59 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

I’d be interested in one please Dave.

Thanks !!
by Budgie
Wed Jun 13, 2018 5:45 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

I think its great just to have the option. Without this your into expensive bulky alternatives !
by Budgie
Wed Jun 06, 2018 9:24 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

This is awesome Dave. Thanks for finally bringing this to life !!
by Budgie
Tue May 29, 2018 5:23 pm
Forum: hardware
Topic: Acorn Master and Electron cartridge breakout
Replies: 45
Views: 3096

Re: Acorn Master and Electron cartridge breakout

I would also like a set please

Thanks

Andy
by Budgie
Sat May 12, 2018 11:36 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

See below the test pattern (bottom only) after switch on and then after a calibration (i.e. pushing the button). Not sure why it doesn't calibrate on switch on ? Is the second image after calibration? If so, then something is wrong as it has picked the worst possible sampling point! Can you grab th...
by Budgie
Fri May 11, 2018 4:42 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

Yes I've monitored the log and it does everything you say. What resistor size did you use in the clock wire ? and was this the 96Mhz clock of the SP_CLK ? The test pattern (especially the bottom half of the screen) definitely makes a difference when testing. If you just look at text it can all look ...
by Budgie
Fri May 11, 2018 2:46 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 995
Views: 57546

Re: RGB to HDMI using a Pi Zero and a small CPLD

Hi Budgie, Great that you have made some progress with this. I had quite a few problems with getting a prototype working reliably. I found the earth between the Pi and the CPLD board needs to be very good. I also needed to add a resistor into sp_clk line to prevent ringing causing unwanted clock tr...