Search found 227 matches

by firthmj
Thu Jun 15, 2017 12:21 pm
Forum: hardware
Topic: OS RAM module
Replies: 79
Views: 4172

Re: OS RAM module

Not adding anything technical to this beyond - WOW!

The more posts I see on this, the more options there seem to be. The latest suggestion of soft loading a custom OS ROM sounds cool!

If you do make a run of boards I'd definitely buy 1, possibly 2.
by firthmj
Thu May 25, 2017 12:27 pm
Forum: software: other
Topic: Sideways RAM Utilities
Replies: 68
Views: 3255

Re: Sideways RAM Utilities

I'm not sure if any of the Solidisk detection code is still in that ROM. At the Cambridge ABug, I had an issue with my utility ROM on flynnjs's Beeb, which has a 2M128 board in it too. My ROM was looking for a B+, and changing the banner if so. The 2M128 board and the Solidisk support ROM seemed to ...
by firthmj
Mon May 22, 2017 7:09 pm
Forum: past events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 190
Views: 12230

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

A quick note to say thank you to Jason N for organising this, I had a great time. I've also uploaded a few pictures of some of the items in the Acorn World exhibition. http://home.marutan.net/~peter/subsite/photos/20170514%20-%20ABUGCamby/ Was this one genuine? http://home.marutan.net/~peter/subsit...
by firthmj
Mon May 15, 2017 9:20 pm
Forum: acorn atom
Topic: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 1203
Views: 84330

Re: Matchbox sized 6502 / Z80 / 6809 Co Pro

Hi, I've updated my CoPro this evening, and I'm seeing the dynamic mode switching lock up quite often I've tried both the latest (LX9CoProCombined_20170514_1320_dmb) and previous stable (LX9CoProCombined_20161110_1455_dmb) designs, and both seem to behave similarly It appears to only happen (so far)...
by firthmj
Sun May 14, 2017 7:40 pm
Forum: acorn atom
Topic: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 1203
Views: 84330

Re: Matchbox sized 6502 / Z80 / 6809 Co Pro

Does that mean you would recommend this build if people are upgrading?
by firthmj
Sat May 13, 2017 10:01 pm
Forum: past events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 190
Views: 12230

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

dp11 wrote:It was me.


Hi, apologies for not making introductions earlier!
by firthmj
Sat May 13, 2017 9:08 pm
Forum: past events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 190
Views: 12230

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

Will be interesting to find out what the solution to the mystery failing CoPro was... Pray tell more... We had one of Jason's more recent green batch that wouldn't run the x86 or ARM designs properly - appeared to be an issue with the external RAM. When I left Jason and someone else (I didn't catch...
by firthmj
Sat May 13, 2017 9:00 pm
Forum: past events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 190
Views: 12230

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

Enjoyable if short visit.

Thanks to jdnbeeb and everyone else involved for organising this!

Will be interesting to find out what the solution to the mystery failing CoPro was...
by firthmj
Fri Apr 21, 2017 3:49 pm
Forum: general
Topic: "Outline specification for the BBC MICROCOMPUTER system"
Replies: 180
Views: 10903

Re: "Outline specification for the BBC MICROCOMPUTER system"

Early versions of Windows too; even Windows 95 had a significant amount of assembler code. Only with Windows NT did it transition to being mostly coded in a high-level language. Richard. One notable difference between Windows and sensible other operating systems is that Windows from 1.0 through to ...
by firthmj
Wed Apr 19, 2017 2:06 pm
Forum: general
Topic: "Outline specification for the BBC MICROCOMPUTER system"
Replies: 180
Views: 10903

Re: "Outline specification for the BBC MICROCOMPUTER system"

Hi, From the original document: The BBC is investigating the possibility of supporting a version of BASIC which is not implemented yet on any single machine but which would be as compatible as possible with existing practice and could be made available within the public domain to any manufacturer wi...
by firthmj
Wed Apr 19, 2017 2:01 pm
Forum: general
Topic: thebbclives website gone.
Replies: 30
Views: 1968

Re: thebbclives website gone.

<snip previous quote> Ahhh, thanks. I actually fixed all that lot over a year ago. Since then however, I've moved from old 32-bit hardware to brand spanking new 64-bit hardware and the application software has had quite the upgrade. The fix was to have a custom 404 error handler which could convert...
by firthmj
Fri Jul 15, 2016 10:20 am
Forum: software: other
Topic: BBC BASIC envelope player?
Replies: 5
Views: 588

Re: BBC BASIC envelope player?

If you want to add an ENVELOPE, then define that before line 50 (e.g. line 15), and then change the volume (the '-15') in line 60 into the envelope number you use. You might also want to extend the duration (the final parameter to the SOUND command) As the Electron only has a single music "voic...
by firthmj
Wed Mar 02, 2016 9:50 pm
Forum: hardware
Topic: Pi FPGA add on
Replies: 2
Views: 338

Pi FPGA add on

Just seen the following promoted on Facebook:

https://www.element14.com/community/doc ... R-LOGI-RPI

Any chance it would make a suitable stepping stone to an "all in one" Raspberry Pi Co-Pro?
by firthmj
Fri Feb 05, 2016 12:06 pm
Forum: software: other
Topic: Linux on a BBC B anyone?
Replies: 16
Views: 1209

Re: Linux on a BBC B anyone?

<snip> I still can't get a shell to run but I think that is more my lack of knowledge of the init/getty/agetty stuff than problems with the kernel as I can stick a load of stuff in the main rc file and get messages up on the screen. <snip> How familiar are you with Busybox? It often provides a good...
by firthmj
Thu Feb 04, 2016 3:21 pm
Forum: software: other
Topic: Linux on a BBC B anyone?
Replies: 16
Views: 1209

Re: Linux on a BBC B anyone?

Congratulations! It seems you've done the lion's share of what has been one of my "wouldn't it be nice" BBC related projects for a very long time! If you can create a portable "Tube Parasite" driver for Linux, then it should (in theory) mean that anything that can run a flavour o...
by firthmj
Sat Jan 30, 2016 11:16 pm
Forum: hardware
Topic: USB Econet (was: Can you tell what it is yet ?)
Replies: 53
Views: 4466

Re: USB Econet (was: Can you tell what it is yet ?)

This USB Econet device looks very interesting. I am looking to add an "Econet Module" to my Pi second processor design. The two devices together should make it easy for people who have no Econet hardware at the moment a low price way of using Econet. To me the most promising feature of US...
by firthmj
Tue Jan 19, 2016 11:10 pm
Forum: acorn atom
Topic: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 1203
Views: 84330

Re: Matchbox sized 6502 / Z80 / 6809 Co Pro

*XADFS and *YADFS are the RetroClinic way of loading two different IDE supporting ADFS images into sideways RAM. One point to note is that the ADFS 1.32 that *XADFS selects does not work well with Co-Pros - I've never worked out why, the original (non-IDE) ADFS it is derived from seems OK. Perhaps ...
by firthmj
Tue Jan 19, 2016 11:07 pm
Forum: acorn atom
Topic: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 1203
Views: 84330

Re: Matchbox sized 6502 / Z80 / 6809 Co Pro

*XADFS and *YADFS are the RetroClinic way of loading two different IDE supporting ADFS images into sideways RAM. One point to note is that the ADFS 1.32 that *XADFS selects does not work well with Co-Pros - I've never worked out why, the original (non-IDE) ADFS it is derived from seems OK. Perhaps w...
by firthmj
Sun Jan 17, 2016 2:08 pm
Forum: software: other
Topic: TurboMMC / SmartSPI, CoPro, OSWord 7F loads to wrong address
Replies: 66
Views: 3683

Re: TurboMMC / SmartSPI, CoPro, OSWord 7F loads to wrong address

Is this a correct summary of the fixes needed? J.2-TUBE .ChkIfToTube PHA -LDA &BE +LDA &A0 STA &1072 -LDA &BF +LDA &A1 STA &1073 LDA &1074 AND &1075 and J.8-COW .sk0 +INY +LDX #2 +JSR &80DA LDY #5 LDA (bptr%),Y CLC ADC #7 STA result% +LDA bptr% +PHA +LDA bptr%+1 ...
by firthmj
Thu Jan 14, 2016 1:15 am
Forum: hardware
Topic: Matchbox ARM2 Co Processor
Replies: 67
Views: 3400

Re: Matchbox ARM2 Co Processor

As Dave M's (sadly dead) ARM Eval was to hand, I couldn't resist the "30 years march of technology" picture! ARMs.JPG Yea, but that one has 4MB! :D :lol: Technically 2MB as pictured, as I took the RAM expansion board out so the interesting chips could be seen! Currently also effectively 0...
by firthmj
Wed Jan 13, 2016 8:46 pm
Forum: hardware
Topic: Matchbox ARM2 Co Processor
Replies: 67
Views: 3400

Re: Matchbox ARM2 Co Processor

And here's an updated matchbox firmware with this fix: LX9CoProCombined_20160113_1438_dmb.zip This fix obviously has the potential to impact other Co Pros, but I've tested SAVE on each and there doesn't appear to be any issues. Dave Thanks for the updated image - seems to work great now! Michael
by firthmj
Wed Jan 13, 2016 8:43 pm
Forum: hardware
Topic: Matchbox ARM2 Co Processor
Replies: 67
Views: 3400

Re: Matchbox ARM2 Co Processor

I think the best option, as Michael suggested, is to look to combine the internal and external memory versions of the 6502, Z80, and 6809. That would slow the internal memory down due the the introduction of a LUT/MUX. Couldn't it be done by extending the memory decode logic? Currently there must b...
by firthmj
Wed Jan 13, 2016 8:40 pm
Forum: hardware
Topic: Matchbox ARM2 Co Processor
Replies: 67
Views: 3400

Re: Matchbox ARM2 Co Processor

As Dave M's (sadly dead) ARM Eval was to hand, I couldn't resist the "30 years march of technology" picture!

ARMs.JPG
by firthmj
Wed Jan 13, 2016 11:41 am
Forum: hardware
Topic: Matchbox ARM2 Co Processor
Replies: 67
Views: 3400

Re: Matchbox ARM2 Co Processor

I'm not sure if all those designs would fit in the flash - I did the maths a while back (and I think it is in the generate MCS script). The FLASH ROM is 4MB (0x400000 bytes) and each design is 0x54000 bytes, meaning 12 designs can be stored. The above list has 10 designs, plus the multiboot loader ...
by firthmj
Wed Jan 13, 2016 1:53 am
Forum: hardware
Topic: Matchbox ARM2 Co Processor
Replies: 67
Views: 3400

Re: Matchbox ARM2 Co Processor

Dave, could the slow 6502 & Z80 internal RAM builds in your "multi builds" be dropped? It would be nice to put the ARM2Co and PiCo in the build for new users but I'm hesitant to replace the BIST as it's useful in checking before I send units out and I don't really want to flash each b...
by firthmj
Tue Jan 12, 2016 9:43 pm
Forum: hardware
Topic: Matchbox ARM2 Co Processor
Replies: 67
Views: 3400

Re: Matchbox ARM2 Co Processor

One other question - are other people having issues with SAVE from AB with this build?

It seemed to work, but the resulting file was garbage (or at least too corrupted to reload)

LOAD seems OK.

Thanks

Michael
by firthmj
Tue Jan 12, 2016 9:29 pm
Forum: hardware
Topic: Matchbox ARM2 Co Processor
Replies: 67
Views: 3400

Re: Matchbox ARM2 Co Processor

I've never heard of a C Compiler for the ARM Eval System. It would be cool to have one. Dave It is mentioned in one of the manuals. I will do some more digging! Hi, The overview manual on Chris's Acorns mentions it: http://chrisacorns.computinghistory.org.uk/docs/Acorn/OEM/AcornOEM_ARMSystemUG.pdf ...
by firthmj
Fri Jan 08, 2016 3:01 pm
Forum: hardware
Topic: Raspberry Pi Zero as a Second Processor anyone?
Replies: 988
Views: 47311

Re: Raspberry Pi Zero as a Second Processor anyone?

Currently only the Model B will work, as there are several hard coded BCM2835 register dependencies in the code. Hi, Does that exclude the Model A, A+, B+ and Zero, which are the same CPU as the original B, but with a different GPIO connector (more pins, possibly some moved if I've read the rest of...
by firthmj
Thu Jan 07, 2016 2:27 pm
Forum: hardware
Topic: Raspberry Pi Zero as a Second Processor anyone?
Replies: 988
Views: 47311

Re: Raspberry Pi Zero as a Second Processor anyone?

I would have thought this: while (k > 32) k -= 32; Would be better as: k &= 0x1F; There's a subtle, but important difference for k = 32, 64, 96 etc - the while will return 32, the & will return 0 Probably fixable with some checks on the initial value of k: k = ((k & 0x1f) == 0 &&...
by firthmj
Thu Jan 07, 2016 2:23 pm
Forum: hardware
Topic: Raspberry Pi Zero as a Second Processor anyone?
Replies: 988
Views: 47311

Re: Raspberry Pi Zero as a Second Processor anyone?

This all looks like fantastic progress!

Some time soon, I'll have to get my LX9 CoPro and a Raspberry Pi connected together so I can join the party!

Dave: Is there any simple instructions on how to get the hardware interconnected and right software loaded on both pieces somewhere?

Michael

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