Search found 910 matches

by KenLowe
Sat Mar 28, 2020 12:47 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 106
Views: 4149

Re: New Raspberry Pi to 1MHz bus interface

Hi KenLowe, I would really like to install the RPi under the Beeb rather than on a Cable if I possibly can. I am happy to remove the Composite Video Connector ... and the Ethernet Socket which will, I believe allow it to be fitted as in the picture below: 20200321_212123.jpg This would require the ...
by KenLowe
Fri Mar 27, 2020 10:41 pm
Forum: hardware
Topic: SOLVED - Master 128 (No2) - Video Fault
Replies: 5
Views: 343

Re: Master 128 (No2) - Video Fault

Edit 3: Well, it started to misbehave again. This time the CMOS data wasn't being read. I piggy backed another RTC on top of the original, and it's all working again. I'll do a proper replacement job later. Finally got around to swapping out the RTC IC this evening. However, it appears that not all...
by KenLowe
Fri Mar 27, 2020 5:53 pm
Forum: hardware
Topic: Adding a Raspberry Pi Second Processor running PiTubeDirect using KenLowe's Level-Shifter Interface
Replies: 17
Views: 401

Re: Adding a Raspberry Pi Second Processor running PiTubeDirect using KenLowe's Level-Shifter Interface

Hoglet has beaten me to it, but here's my quick fire answers: 1) *CONFIGURE INTUBE - Does this only apply to the Master and not necessary for the Beeb? Correct. 2) How do I revert to a "Normal" Beeb without removing the Raspberry Pi? Is it *FX 151,230,14 ? Is there a *NOTUBE equivalent for the Beeb?...
by KenLowe
Fri Mar 27, 2020 3:51 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55781

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

I managed to download v2.1. The link on the Wiki page is pointing to a dead location, so I just went with the file in the Master branch. I'll pull the file from the dev branch instead, and try again. I do believe that IBOS is making changes to the 6845 registers. I'm not entirely sure why. I did sta...
by KenLowe
Fri Mar 27, 2020 1:43 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55781

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

What value did you end up needing to use for H Offset. I'm using the BBC Micro v21-v23 profile, and I set H Offset to 100 (I think it was set at 126 by default). This shouldn't really have been necessary, so it does make me wonder if the IntegraB is somehow having an effect. Is there a schematic so...
by KenLowe
Fri Mar 27, 2020 1:31 pm
Forum: hardware
Topic: Adding a Raspberry Pi Second Processor running PiTubeDirect using KenLowe's Level-Shifter Interface
Replies: 17
Views: 401

Re: Adding a Raspberry Pi Second Processor running PiTubeDirect using KenLowe's Level-Shifter Interface

I have just tested the two failing RPis by booting them in Raspbian and they seem to work perfectly well. I have a damaged Pi 3 that behaves in exactly the same way: Raspbian will boot fine, but PiTubeDirect no longer boots at all. It got damaged when I plugged it into the level shifter mis-aligned...
by KenLowe
Fri Mar 27, 2020 1:19 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55781

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

That's me updated the CPLD. In the end, I just went with the Xilinx programmer and iMPACT in a Windows 7 virtual environment, and it all worked fine.

I still needed to make an adjustment to the Horizontal Offset, but I had sufficient range to bring in the cropped edge. All good now.

Thanks
by KenLowe
Fri Mar 27, 2020 12:15 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55781

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

Any idea why my BBC Micro with IntegraB might be doing this clipping (in Mode 7 only)? Resolution is set to 1920x1080 50Hz to match TV resolution. That usually indicates a mismatch between the software profile and the CPLD version What software release are you using? What CPLD version is programmed...
by KenLowe
Fri Mar 27, 2020 9:57 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55781

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

I solved simply adjusting x and y offset in geometry setting for mode 7, and saving configuration. But mine wasn't the native resolution, and I have that cropping only with older board and sw, if I remember fine. That didn't seem to work for me. From memory, the default Horizontal Offset was set to...
by KenLowe
Fri Mar 27, 2020 7:15 am
Forum: hardware
Topic: Adding a Raspberry Pi Second Processor running PiTubeDirect using KenLowe's Level-Shifter Interface
Replies: 17
Views: 401

Re: Adding a Raspberry Pi Second Processor running PiTubeDirect using KenLowe's Level-Shifter Interface

I am happy to have a go at it but if it would be easier, I could package the two Pis and send them to any one of you by post. I am out in the sticks so fairly easy to drop in the post. I'd be happy to take a look. Dave, I'm thinking it might be appropriate for me to send you one of my tube level sh...
by KenLowe
Fri Mar 27, 2020 12:59 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 955
Views: 55781

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

Any idea why my BBC Micro with IntegraB might be doing this clipping (in Mode 7 only)?

Resolution is set to 1920x1080 50Hz to match TV resolution.
by KenLowe
Thu Mar 26, 2020 12:40 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1174
Views: 131466

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Switching back to EggEater, it's also working fine. Thanks for pointing me in the right direction again.
by KenLowe
Thu Mar 26, 2020 12:03 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1174
Views: 131466

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

My RPi 1B has the two mounting holes: 20200326_105459.jpg There's not much to go wrong with the header. Definitely no shorts. ***FFS. Note to self: Don't use a jumper to keep header pins apart*** 20200326_105515.jpg With the level shifter disconnected, here's the power up log: ▒▒▒▒▒▒▒▒`▒▒▒▒▒enable_M...
by KenLowe
Thu Mar 26, 2020 10:05 am
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1174
Views: 131466

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

I've just tried this latest release, but it isn't working either. No data on the serial link. I therefore decided to remove the level shifter altogether, and hook the serial comms directly onto the GPIO header. When I do this, I can see valid data being streamed from the RPi. Next step was to use on...
by KenLowe
Thu Mar 26, 2020 7:16 am
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1174
Views: 131466

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

To aid discussion / fault finding, I've attached a couple of photographs showing the setup on my RPi 3B and the equivalent setup on my RPi Model B. The header extension on my RPi Model B is a bit of a bodge. I'm using 2 off 1x4 header strips and 2 off 1x10 header strips as that's all I had available...
by KenLowe
Wed Mar 25, 2020 10:35 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1174
Views: 131466

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

So, I managed to hook up a serial interface, and get good data from the RPi 3B, but absolutely nothing from the RPi Model B. Could it be something to do with the fact that on the Model B, pins 3, 5 & 13 have a different assignment compared to the Model 3B? Although, I presume the PI version detectio...
by KenLowe
Wed Mar 25, 2020 10:05 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1174
Views: 131466

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Which version of PiTubeDirect are you using? The as-yet-unreleased Fer-de-Lance is probably a good one - Dave revamped the detection of various Pi models. I think you need to build from source though. See the branch here: https://github.com/hoglet67/PiTubeDirect/tree/fer-de-lance-dev I'm using EggE...
by KenLowe
Wed Mar 25, 2020 9:50 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1174
Views: 131466

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

I'm trying to get PiTubeDirect running on an old 26pin Raspberry Pi Model B (I think), but it's not working. Set up is level shifter is connected to beeb via 40 way ribbon. The other end of the level shifter is close coupled to the 26 pins of the RPi pins 27 thru 40 on the level shifter are not conn...
by KenLowe
Wed Mar 25, 2020 12:58 am
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 106
Views: 4149

Re: New Raspberry Pi to 1MHz bus interface

Folks, Firstly, I must point out that I am no expert on the Music 5000 hardware, so I'm not going to be able to offer much in the way of support here. However, I thought I would post up a SCSI disk image that was used to help with testing both the emulated SCSI drive and the Music5000 hardware, and ...
by KenLowe
Tue Mar 24, 2020 11:55 am
Forum: for sale / freebies
Topic: FS: Raspberry Pi to 1MHz bus interface
Replies: 26
Views: 883

Re: FS: Raspberry Pi to 1MHz bus interface

Folks,

I'm putting a pause on selling these, whilst there are movement restrictions in place. I've posted out to everyone who has paid me, so assuming postal service remains active, everyone who has purchased from me should receive their package shortly.

Thank you, and stay safe!

Ken.
by KenLowe
Tue Mar 24, 2020 12:30 am
Forum: stardot.org.uk
Topic: Site Icon
Replies: 6
Views: 304

Site Icon

Is it just me, or does the little icon on the tab for the web page look like a spider dangling from the top of the screen??? There's a little bit of dark grey behind the * that looks like the legs! It kinda creeps me out 8-[ 8-[ :lol: :lol:
StarDot Spider.PNG
Creepy Spider
StarDot Spider.PNG (1.55 KiB) Viewed 304 times
by KenLowe
Tue Mar 24, 2020 12:20 am
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 141
Views: 10362

Re: Raspberry Pi to 1MHz bus interface

It was brought to my attention yesterday that some people who noted interest for the original passive level shifter might have thought that they were on the wait list for the new level shifter that I am building. To be clear, I have only recorded notes of interest from individuals who have specifica...
by KenLowe
Sun Mar 22, 2020 10:58 am
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 141
Views: 10362

Re: Raspberry Pi to 1MHz bus interface

Component selection was a bit manual. To start with, component selection for the board design was based on the list of components that JLC had in stock, and even with this list I tried to select their 'basic' components to avoid paying extra to use their 'extended' parts. Once my board design was co...
by KenLowe
Sun Mar 22, 2020 9:00 am
Forum: hardware
Topic: Adding a Raspberry Pi Second Processor running PiTubeDirect using KenLowe's Level-Shifter Interface
Replies: 17
Views: 401

Re: Adding a Raspberry Pi Second Processor running PiTubeDirect using KenLowe's Level-Shifter Interface

BigEd wrote:
Sun Mar 22, 2020 8:55 am
BTW, for technical reasons, it's better to

Code: Select all

*CONFIGURE INTUBE
Ah. Okay. I'll update my Installation Notes accordingly.
by KenLowe
Sun Mar 22, 2020 1:27 am
Forum: hardware
Topic: Adding a Raspberry Pi Second Processor running PiTubeDirect using KenLowe's Level-Shifter Interface
Replies: 17
Views: 401

Re: Adding a Raspberry Pi Second Processor running PiTubeDirect using KenLowe's Level-Shifter Interface

Yup. All you need to do is copy the contents of the zip file to the root of the SD card. Pop the card into the RPi and switch on. If you're using a beeb, then the startup message should change to Acorn TUBE 6502 64K. It may take a further BREAK to get this message if the beeb boots up before the RPi...
by KenLowe
Sat Mar 21, 2020 11:53 pm
Forum: for sale / freebies
Topic: FS: Raspberry Pi to 1MHz bus interface
Replies: 26
Views: 883

Re: FS: Raspberry Pi to 1MHz bus interface

Wheel_nut wrote:
Sat Mar 21, 2020 11:48 pm
Please could you add my request for One Tube "Under" Level Shifter Board to your list.

I can pay by PayPal Friends and Family whenever you are ready.

Robin
I've added you to the list, and sent you a PM.
by KenLowe
Sat Mar 21, 2020 10:04 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 106
Views: 4149

Re: New Raspberry Pi to 1MHz bus interface

It may well work, but difficult to tell until you get all the parts and lay it out. Another point worth remembering is that you will likely need to power the RPi from an external source. You probably don't want to power up from the Tube port. Even with the desire to fit the PI under the beeb, I coul...
by KenLowe
Sat Mar 21, 2020 9:17 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 141
Views: 10362

Re: Raspberry Pi to 1MHz bus interface

I'm interested in how you get on with jlc's assembly service I've not tried it yet but might for my next project at least for the bulk of the smd parts. Thought I'd provide some feedback now that I've had a few batches of boards built. Build quality of the first batch was good, but I've been less t...
by KenLowe
Sat Mar 21, 2020 8:08 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 106
Views: 4149

Re: New Raspberry Pi to 1MHz bus interface

I think I might have a possible solution without needing to remove the composite video connector from your RPi board. I should be able to get hold of some elevated 2x13 sockets that can be soldered onto the level shifter, and allow the level shifter to sit just proud of the composite video connector...
by KenLowe
Sat Mar 21, 2020 4:33 pm
Forum: hardware
Topic: New Raspberry Pi to 1MHz bus interface
Replies: 106
Views: 4149

Re: New Raspberry Pi to 1MHz bus interface

You do need to make arrangements to connect to the 26 pin header. One approach is to desolder the composite connector, at which point a 40 pin connector will just work. But it's tricky to desolder as it's so chunky. (Another approach (in theory) would be to fit a 26 pin connector to a 40 way cable,...