Search found 76 matches

by Budgie
Sat Jul 14, 2018 6:44 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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: 188
Views: 7060

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: 188
Views: 7060

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: 188
Views: 7060

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: 188
Views: 7060

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: 44
Views: 1279

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: 188
Views: 7060

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: 188
Views: 7060

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: 188
Views: 7060

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...
by Budgie
Thu May 10, 2018 11:37 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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

Well I've programmed the CPLD and after some messing it works ! I've used a CPLD board I had which creates a Spectrum ULA for the RC2014 board. Just something I had which allowed me to use a XC95144XL CPLD. Well for anyone else who may be messing around with this I have found the following 1. If you...
by Budgie
Tue May 08, 2018 11:05 pm
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 168
Views: 15169

Re: BeebSCSI mini

Hi,

I’ve just ordered one.

Thanks

Andy
by Budgie
Thu May 03, 2018 10:48 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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

Think I now have the pi code compiled and working. It comes up with INFO: RGB to HDMI booted INFO: Nominal clock = 384000000 Hz That seems OK - does it hang at that point? The next thing it does it to try to do some measurements of the VSYNC frequency, and I'm not sure what happens if there is no V...
by Budgie
Thu May 03, 2018 5:56 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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

Think I now have the pi code compiled and working.

It comes up with

INFO: RGB to HDMI booted
INFO: Nominal clock = 384000000 Hz


Hope thats correct. Now onto the CPLD. I'm away this weekend so maybe sometime next week...
by Budgie
Wed May 02, 2018 8:48 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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

dp11 wrote:Under windows use the bash shell . Roughly follow the instructions here :https://github.com/hoglet67/PiTubeDirec ... pendencies
Thanks. Just looked there now after remembering PiTubeDirect was also based on a bare metal solution.

Will give this a go

Andy
by Budgie
Wed May 02, 2018 8:20 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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

Hi Dave

How do I compile the Pi source code. I’m running Windows. Do I need to download CMake and then play with the scripts. Just asking now in case I start installing all this and it’s not the correct process.

Thanks !

Andy
by Budgie
Thu Apr 26, 2018 9:55 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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

I'll have a look at this tonight. From what I can see, it should be possible to simplify it a bit by removing the 3.3V regulator (seeing as the Pi will power the 3V3 rail) and moving the JTAG header out of the way of the signals that go to the Pi. I'll report back once I've had a go at it! So that ...
by Budgie
Mon Apr 23, 2018 6:47 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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

Andy, This project probably isn't ready for prime-time yet, but if you are interested in prototyping then everything is on github. What issue is your Electron? If it's an issue 6, then you don't need the 74LS08, and prototyping becomes a bit easier. Dave Thanks Dave. It's an issue 6. I'll let you k...
by Budgie
Mon Apr 23, 2018 5:49 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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

Is there any update on the production of the pcb or making the design available ? I overpromised a bit there :) Came down with shingles in January, and that derailed my retro hardware efforts for a while. Hoglet put up his current designs here ; if you're feeling adventurous, I think the V2 PCB wou...
by Budgie
Sun Apr 22, 2018 9:08 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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

Just chiming in to confirm that I am indeed planning on helping out with the PCB (although I haven't started yet). Hoglet has actually already designed a pretty nice PCB for it, so my job is to shrink it down a little and move some stuff around to make it easier to design an enclosure for. I've bee...
by Budgie
Wed Apr 18, 2018 8:51 pm
Forum: hardware
Topic: P.R.E.S. AP5 - Original and Re-Design
Replies: 287
Views: 22003

Re: P.R.E.S. AP5 - Original and Re-Design

Hi Dave

Do you have any AP5s and cases still available please ? I’ve sent you a PM,.

Thanks

Andy
by Budgie
Thu Feb 22, 2018 9:36 am
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 637
Views: 43925

Re: ICE T65/Z80/6809

Thanks Dave :D

I’ll give that a try. This is my board
by Budgie
Thu Feb 22, 2018 12:01 am
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 637
Views: 43925

Re: ICE T65/Z80/6809

It’s MartinBs User/ROM/RAM board with one of those cheap SD modules plugged into the User port.

I’ll have to take a picture

Thanks

Andy
by Budgie
Sat Feb 17, 2018 6:08 pm
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 637
Views: 43925

Re: ICE T65/Z80/6809

Thanks. Its more stable with that change but still doesn't read from the SD card but neither does a UM6502CE

Andy
by Budgie
Thu Feb 15, 2018 10:16 pm
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 637
Views: 43925

Re: ICE T65/Z80/680

Crazy as it may seem I’ve not actually included that read code so im not reading on a clock edge. Should have at least added that but skipped it completely thinking its only second processor related. I will add that and perform some further testing and let you know the results Thanks for the info Andy
by Budgie
Wed Feb 14, 2018 11:34 pm
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 637
Views: 43925

Re: ICE T65/Z80/6809

Hi Dave I’ve just been playing around with the GODIL in an Electron. I just used the T65 core (same version you have in ICE T65) with some additions you created to create the correct timings for writes to the data bus and also clocks Phi1 and Phi2. i.e. Data <= Dout when Phi0_c = '1' and R_W_n_int =...
by Budgie
Tue Jan 30, 2018 12:00 am
Forum: hardware
Topic: Electron 6502 desolder / socket pics + Max 10 FPGA in CPU socket
Replies: 34
Views: 1881

Re: Electron 6502 desolder / socket pics

Have you seen these boards ? May not give you enough GPIOs and creating your own BGA board sounds great but just thought I’d post this just in case you may find it useful. The MAX10s are an interesting FPGA with instant on functionality etc. I’ve got one of these boards but not done anything with it...
by Budgie
Sat Jan 27, 2018 3:05 pm
Forum: hardware
Topic: Myelin's FX2 Tube/Cartridge Adapter - Development and Support
Replies: 46
Views: 2224

Re: Myelin's FX2 Tube/Cartridge Adapter - Development and Support

I've completed my FX2 Tube Cartridge . Thanks Phil

It's at least working with the Pi Tube. Still yet to test the Logic Analyser. I also need to add the 5V wire to save having to connect the Pi separately
by Budgie
Thu Jan 25, 2018 10:33 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 188
Views: 7060

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

This is awesome. I would certainly be up for one of these. Would be great to connect newer monitors.

Always amazed by the skills involved with all this.

Andy
by Budgie
Sun Jan 14, 2018 7:06 pm
Forum: hardware
Topic: Simple Electron flash cartridge with 39SF010 + 74HCT00
Replies: 61
Views: 4558

Re: Simple Electron flash cartridge with 39SF010 + 74HCT00

This is my setup that the Flash Cartridge is currently working in. I have programmed "Snapper" as you can see. I'm mainly using these boards to play around with and understand electronics and also learn VHDL. My purchase of the Electron and BBC micro has been within the last couple of years. I used ...
by Budgie
Sat Jan 13, 2018 3:55 pm
Forum: hardware
Topic: Simple Electron flash cartridge with 39SF010 + 74HCT00
Replies: 61
Views: 4558

Re: Simple Electron flash cartridge with 39SF010 + 74HCT00

Hi Myelin, I've progressed further now and have it working following your earlier feedback. Its looks like the SRAM UTILS as part of the AP6 don't work on this board. Still now quite sure why. BTW This is the first time I've even compiled any BBC code so that's what took most of the time. Realised t...