Search found 1000 matches

by fordp
Sun Mar 17, 2019 7:42 pm
Forum: software & utilities for the pc, mac or unix
Topic: Matrix Brandy BASIC V for Linux with SDL: V1.21.19 released
Replies: 520
Views: 22158

Re: Matrix Brandy BASIC V for Linux with SDL: V1.21.19 released

The reason I ask is that I would like a build for the Native Raspberry Pi CoPro with hardware VFP floating point. Are the floats in Brandy compatible with the VFP on the Pi? I have to say, I don't know - I don't really know anything about the Pi's VFP instructions (last ARM programming I did was YE...
by fordp
Sun Mar 17, 2019 12:45 pm
Forum: software & utilities for the pc, mac or unix
Topic: Matrix Brandy BASIC V for Linux with SDL: V1.21.19 released
Replies: 520
Views: 22158

Re: Matrix Brandy BASIC V for Linux with SDL: V1.21.19 released

The reason I ask is that I would like a build for the Native Raspberry Pi CoPro with hardware VFP floating point. Are the floats in Brandy compatible with the VFP on the Pi?
by fordp
Sat Mar 16, 2019 6:15 pm
Forum: software & utilities for the pc, mac or unix
Topic: Matrix Brandy BASIC V for Linux with SDL: V1.21.19 released
Replies: 520
Views: 22158

Re: Matrix Brandy BASIC V for Linux with SDL: V1.21.19 released

Has anybody tried building Matrix Brandy for RiscOS on a Pi?
by fordp
Thu Mar 14, 2019 6:01 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

I will have a look for a PI connector. Maybe on the keyboard side just like where PL8 used to be. When mounted at the level shifters it might clash with an internal eurocard board in PL6/7. I agree that there should be a Pi Zero connector :) Would it not make more sense on the other side of the boa...
by fordp
Wed Mar 13, 2019 6:02 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

I have a simple request which yet again you can of course ignore without offending me. I hear you are using the extra connector. Would it be possible to put the Atom Keyboard on that connector. The thinking behind this is that the keyboard is optional so by not fitting a board to board connector for...
by fordp
Tue Mar 12, 2019 10:23 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

I mainly do software these days so pay me little head but is the 7445 a 5V device in which case will it not feed 5 V back in to the keyboard inputs?

Maybe they are open collector in which case may well be OK.
by fordp
Tue Mar 12, 2019 9:34 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

Like Dave said earlier this is an Atom first and foremost. I still think a pretty good master or Electron can be made on the same board and the challenge of that interests me. If we have a Pi interface then an onboard 6502 CoPro will not be required which should mean the memories will not need to be...
by fordp
Tue Mar 12, 2019 5:32 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

roland wrote:
Tue Mar 12, 2019 2:03 pm
hoglet wrote:
Tue Mar 12, 2019 12:51 pm
Do you mean SOJ-36 for the SRAM?
Yes, that's the one I mean. The PLCC are easier to find....


What are SOJ-36 components used for if it's so hard to find a socket for them?
They used to be used for cache RAM and Graphics RAM but cache went on chip and graphics moved to DDR and GDDR.
by fordp
Tue Mar 12, 2019 12:55 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

SOJ sockets are like hens teeth but they did manage to source some for the SpectrumNext project.
by fordp
Tue Mar 12, 2019 12:46 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

Did you mean PLCC32??? For PLCC I guess China is the answer: e.g. https://www.aliexpress.com/item/Complete-PLCC-general-adapter-set-includes-PLCC20-28-32-44-to-DIP20-24-28-32-40/32809824378.html?spm=2114.search0104.3.2.79af2a1c9uRhWj&ws_ab_test=searchweb0_0,searchweb201602_8_10065_10068_10130_10547_...
by fordp
Mon Mar 11, 2019 11:27 am
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

Just to be clear emulating a BBC Master plus 65c02 CoPro would take 128K Master RAM (Equivalent to the 4464 x 4) plus 256K Sideways Space, plus the OS ROMS plus 64K for the Copro. I think that will fit in 512K Bytes, Phew!
by fordp
Mon Mar 11, 2019 10:56 am
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

There is something to be said for not having parallel Flash as it can be much slower than RAM. A common option is to copy the ROM contents from a serial FLASH memory. It may be possible to store the ROMs on the flash chip on the FPGA board?
by fordp
Sun Mar 10, 2019 11:31 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

Do not be too hasty. The RAM is more important than the flash. This has to be an Atom first with anything else being a lucky bonus I think. I guess if it does not compromise the design 5V memories could be OK. If the address lines are always from the FPGA they may not need level shifting.
by fordp
Sun Mar 10, 2019 7:13 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

Simon, do you suggest that you actually want such a board as you are already searching for components :lol: But what on earth should we store in 1MB memory in an Atom? 640 kB ought to be enough :mrgreen: You are not thinking laterally. I am good at that. That memory may be a bit of overkill for an ...
by fordp
Sun Mar 10, 2019 11:52 am
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

I would plus 1 on the previous post and have 2 bits per colour. I think 2 extra pins would be well used on upping the RAM and Flash to 512K Bytes each Nothing to do with me having SST39SF040-70-4C-PHE and AS6C4008-55PCN in stock ;)
by fordp
Sun Mar 10, 2019 8:23 am
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

Memories will run at 3.3V. Within a few days I will post the first draft of the schematic diagram. Brilliant. Just one more idea to save lots of pins at the expense of some logic gates but I would have thought the keyboard could be multiplexed on to the address and data bus with just maybe one pin ...
by fordp
Sat Mar 09, 2019 9:57 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 170
Views: 4891

Re: Atom 2k18 ?

This looks interesting. I am not totally sure why you would run the memories at 5V however I would have thought running those at 3.3V would have saved a lot of complexity.
by fordp
Fri Mar 08, 2019 7:02 pm
Forum: hardware
Topic: Music 5000 FPGA
Replies: 69
Views: 11698

Re: Music 5000 FPGA

I wonder do you think somehow this could be hooked up to something other than a BBC micro......say a raspberry pi or something? Not directly, as the 1MHz bus is 5V TTL. You could design a similar adapter board for the Pi, but replace the level shifters and 1MHz Bus connector with Pi GPIO connector....
by fordp
Fri Mar 08, 2019 3:33 pm
Forum: hardware
Topic: Beeb 1MHz Bus FPGA Adaptor
Replies: 41
Views: 1055

Re: Beeb 1MHz Bus FPGA Adaptor

The FPGA board on ebay looks like the JTAG connector will clash with your PCB Dave. Maybe it will have to be taken out and soldered on the other side of the PCB? Are you going from the picture on eBay? That's not actually accurate. The board that is now shipped is slightly different. Look at the pi...
by fordp
Fri Mar 08, 2019 9:25 am
Forum: hardware
Topic: Beeb 1MHz Bus FPGA Adaptor
Replies: 41
Views: 1055

Re: Beeb 1MHz Bus FPGA Adaptor

The FPGA board on ebay looks like the JTAG connector will clash with your PCB Dave. Maybe it will have to be taken out and soldered on the other side of the PCB?
by fordp
Thu Mar 07, 2019 6:04 pm
Forum: hardware
Topic: Beeb 1MHz Bus FPGA Adaptor
Replies: 41
Views: 1055

Re: Beeb 1MHz Bus FPGA Adaptor

hoglet wrote:
Thu Mar 07, 2019 11:46 am
fordp wrote:
Thu Mar 07, 2019 10:04 am
I do not seems to be able to edit/open the WIki.
Try again now Ford.
Thanks Dave,
It works!
by fordp
Thu Mar 07, 2019 10:04 am
Forum: hardware
Topic: Beeb 1MHz Bus FPGA Adaptor
Replies: 41
Views: 1055

Re: Beeb 1MHz Bus FPGA Adaptor

I do not seem to be able to edit/open the WIki. I thought you could open just the Wiki to the whole of Github but I could be wrong on that!

https://help.github.com/en/articles/cha ... -for-wikis
by fordp
Thu Mar 07, 2019 8:43 am
Forum: hardware
Topic: Beeb 1MHz Bus FPGA Adaptor
Replies: 41
Views: 1055

Re: Beeb 1MHz Bus FPGA Adaptor

Do you have a github repository yet Dave?

I would like to work on the a Wiki for 1MHz bus devices and this would seem like a good place for it. I do not need access to "code" I would do all that on a fork with push requests.

I will take a board/kit if one becomes available too, ta!
by fordp
Mon Mar 04, 2019 1:04 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 25
Views: 1178

Re: Raspberry Pi to 1MHz bus interface

Sorry I just noticed this. Anything I can do to help, I have quite a few ideas for this board ;)
by fordp
Wed Feb 27, 2019 1:58 pm
Forum: hardware
Topic: BBC Master over VNC
Replies: 12
Views: 586

Re: BBC Master over VNC

If you want more of a challenge then using Hoglets Pi Adapter could be a great basis for VNC on 8 bit computers:
viewtopic.php?f=3&t=14430
This is because it should be pretty much pixel perfect.
by fordp
Tue Feb 26, 2019 12:58 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 297
Views: 19513

Re: Proposed: "The Ultimate Electron Upgrade"

I would guess that most people will use either
1) RGB Scart
or
2) VGA (Scan Doubler)

NULA support would be great.

Maybe design it for the two above, with an optional buffer chip on the MSB of the colours to drive TTL?
by fordp
Thu Feb 21, 2019 6:53 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 297
Views: 19513

Re: Proposed: "The Ultimate Electron Upgrade"

Sorry to punt out the same idea I mentioned before but creating a new motherboard to put in the Electron case would make the most sense. If you are not using the DRAM and are replacing the ULA and the 8 colour video circuit is no use then what is left. You could build in most of the expansion option...
by fordp
Sat Feb 16, 2019 11:14 pm
Forum: programming
Topic: How do you edit your BASIC programs?
Replies: 53
Views: 1408

Re: How do you edit your BASIC programs?

you could use any editor on the PC to edit basic programs. Not 'tokenised' (internal format) BASIC programs, which is what programs in an SSD are likely to be. "Any editor on the PC" is only going to be useful for plain text files, such as might be created by *SPOOL and/or loaded with *EXEC, but th...
by fordp
Thu Feb 14, 2019 1:35 pm
Forum: programming
Topic: How do you edit your BASIC programs?
Replies: 53
Views: 1408

Re: How do you edit your BASIC programs?

I am not sure how it works but Windows allows you to dig in to zips and treat them like a subdirectory. You could do the same for SSD, DSD and MMB files and then you could use any editor on the PC to edit basic programs.