Search found 2301 matches

by Prime
Tue Aug 29, 2017 9:49 am
Forum: acorn atom
Topic: Atoms ahoy on HACKADAY!
Replies: 9
Views: 240

Re: Atoms ahoy on HACKADAY!

If your AtoMMC code is still based on my AVR code, you could try upgrading the version of FATFS it uses, I upgraded DragonMMC to use 0.09 (I believe) and that seems to work fine with SDHC cards, must try it with a couple of SDXC cards before release (which is imminent).

Cheers.

Phill.
by Prime
Tue Aug 15, 2017 1:20 am
Forum: software: other
Topic: NIBL - an influence on Atom Basic??
Replies: 2
Views: 241

Re: NIBL - an influence on Atom Basic??

Doubt it implies any kind of heritage, but Oric BASIC (which was derived from MS BASIC) used '#' as a hex literal prefix too. Not sure if 'vanilla' MS BASIC had that. Dragon / CoCo basics which are MS basic use &H, I believe in some MS basics you could use &O for octal, but I may be fuzzy t...
by Prime
Mon Aug 07, 2017 2:03 pm
Forum: acorn atom
Topic: My new Atom greets me with nothing but P's
Replies: 20
Views: 645

Re: My new Atom greets me with nothing but P's

- is the a 60 Hz signal on pin 10 of the 8255? If not, is there a 60Hz on pin 37 of the 6847? If yes then you have a bad track between those pins, if not, is there a 3.58MHz signal on pin 33 of the 6847? As he's getting a picture I would say the clock to the 6847 is OK, as there would be nothing at...
by Prime
Mon Aug 07, 2017 10:42 am
Forum: acorn atom
Topic: My new Atom greets me with nothing but P's
Replies: 20
Views: 645

Re: My new Atom greets me with nothing but P's

Thanks for the suggestions. I will give it a clean with some isopropyl alcohol and inspect it all again. The PSU is an older AT PC type, which I'm using rather than ATX because it has the integrated power button. It measures a constant 5.17v with no load, the VCC pins of some ICs measured were appr...
by Prime
Mon Aug 07, 2017 6:22 am
Forum: acorn atom
Topic: My new Atom greets me with nothing but P's
Replies: 20
Views: 645

Re: My new Atom greets me with nothing but P's

Also just to check, what power supply are you running it on?

What is it's output voltage?

Cheers,

Phill.
by Prime
Fri Jul 28, 2017 2:54 pm
Forum: hardware
Topic: 4corn update 28/07/2017 - Circuit Diagrams
Replies: 8
Views: 291

Re: 4corn update 28/07/2017 - Circuit Diagrams

Firefox hewr won't load them just comes up with broken link icon :(, Chrome seems to display them ok.

Running on Windows 7 64 bit ff : 54.0.1 (32-bit).

Right click, save as seems to work from firefox tho.

Will try again later from home.

Cheers.

Phill.
by Prime
Wed Jul 26, 2017 8:21 am
Forum: other vintage computer hardware, software and games
Topic: 386 Restoration
Replies: 7
Views: 396

Re: 386 Restoration

I find it odd that itt will only accept 4Mb of RAM IIRC the 386sx could address up to 16mb, and the motherboard has 8 sockets, so I would have thought that it should be able to access more. Though your simms do need to be fitted in pairs. The hard disk error may be that you need to access the cmos s...
by Prime
Sun Jul 23, 2017 4:08 pm
Forum: off-topic
Topic: Resolving dos paths....
Replies: 1
Views: 150

Resolving dos paths....

Posted here on the offchance someone can help.... Does anyone out there have source (or link to source) for resolving relative paths in an environment where I can't just call an OS library function***. I ideally want to convert something like "c:\test\..\test2\file.txt" into "c:\test2...
by Prime
Thu Jul 20, 2017 5:30 pm
Forum: hardware
Topic: AtoMMC on the Beeb's 1mhz bus.
Replies: 29
Views: 563

Re: AtoMMC on the Beeb's 1mhz bus.

I think you need a ROM like the Atomic SDDOS. Just copy a disk image to the SD card en mount it with SDDOS to a drive. This way you can mount 4 diskdrives. The AtoMMC controler calculates the sectornr and load or saves a sector just like the original DOS does. I also took this approch with DragonMM...
by Prime
Tue Jul 18, 2017 3:47 pm
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 535
Views: 21986

Re: ICE T65/Z80/6809

I've found that the flood and wick method works for me : 1) Flux the pads 2) Line up the chip to the pads, magnification helps here unless you have bionic eyes..... 3) Tack opposite corners of the chip,and check alignment again (with microscope) this way you can adjust position if needed. 4) flood w...
by Prime
Mon Jul 10, 2017 12:23 pm
Forum: other vintage computer hardware, software and games
Topic: Old hardware and keeping it 'original'
Replies: 42
Views: 1238

Re: Old hardware and keeping it 'original'

Wow, what a can of worms I seem to have opened :) Personally, I'd rather have a working machine than a broken one that's 'mint'. A computer is meant to compute, run programs play games etc, if it does not do so for a reason other than technical e.g. bust Electron ULA which are not available, then it...
by Prime
Thu Jul 06, 2017 9:23 am
Forum: for sale / freebies
Topic: For free: RISC OS 3.50 ROMs
Replies: 4
Views: 319

Re: For free: slightly damaged 486DX4 PC card, RISC OS 3.50 ROMs

I'll have the 486 card if no one else wants it, I think that's the 100MHz version which is faster than the one I have. Phill, if you do get hold of it, please let us know how the repairs proceed . . . I was going to ask, but then realised I'd way too many projects on the go already :? Quite well ac...
by Prime
Thu Jul 06, 2017 9:03 am
Forum: other vintage computer hardware, software and games
Topic: Old hardware and keeping it 'original'
Replies: 42
Views: 1238

Old hardware and keeping it 'original'

Hi all, This may be a bit of a rant, inspired by the System 1 discussion on the LOLPRICE thread. But something I really can't understand is where the desire to keep something 'original' happens at the expense of getting it working. For example had it been me I would have just replaced the ribbon cab...
by Prime
Fri Jun 23, 2017 8:33 pm
Forum: acorn atom
Topic: AtomSID
Replies: 15
Views: 885

Re: AtomSID

Yeah the board I designed is a bit smaller (it's double sided which helps) but also uses a step up module to 12V, and then a 9V reg if needed, with a jumper to select 12V/9V to power the SID from, I'll post a picture when I get back from my holiday :)

Cheers.

Phill.
by Prime
Wed Jun 21, 2017 3:12 pm
Forum: acorn atom
Topic: Creating a Atomic Chess Board...
Replies: 26
Views: 708

Re: Creating a Atomic Chess Board...

As the datasheet says "all CMOS designs", since the 7445 (or LS45) isn't maybe Acorn found they needed the pullups.

Cheers.

Phill.
by Prime
Wed Jun 21, 2017 8:48 am
Forum: acorn atom
Topic: Creating a Atomic Chess Board...
Replies: 26
Views: 708

Re: Creating a Atomic Chess Board...

Being open collector, don't you also need pullups? Just checked the Atom keyboard circuit and that does indeed have pullups, unless the 6522 has them internally, I know one of the ports on the 6821 do so might be the case here too :) It's also worth noting that 74xx145 are also compatible. Cheers, P...
by Prime
Sat Jun 10, 2017 10:15 pm
Forum: acorn atom
Topic: Is there still any interest for Atom2k15 boards
Replies: 14
Views: 590

Re: Is there still any interest for Atom2k15 boards

They use the PLCC Xilinx XC95xxXL chips don't they? With a small amount of re-engineering they could be converted to use the same chips in TQFP which are still available. Though I did wonder about making an adapter board as thingls like the Atom RAMROM have the same problem.

Cheers.

Phill.
by Prime
Fri Jun 09, 2017 7:10 pm
Forum: for sale / freebies
Topic: For free: RISC OS 3.50 ROMs
Replies: 4
Views: 319

Re: For free: slightly damaged 486DX4 PC card, RISC OS 3.50 ROMs

I'll have the 486 card if no one else wants it, I think that's the 100MHz version which is faster than the one I have.

Cheers.

Phill.
by Prime
Wed Jun 07, 2017 3:06 pm
Forum: hardware
Topic: PSU question.
Replies: 11
Views: 484

Re: PSU question.

It should run without a load, but I think the auxiliary supply voltages will be out of spec. So use a load. I use a 6V 4W lamp. Mark Might fire it up first, check the 5V, and if that's ok put a load on the 5V and check the others (+12 and -12 in this case). Also any idea how long the HT caps take t...
by Prime
Wed Jun 07, 2017 12:13 pm
Forum: hardware
Topic: PSU question.
Replies: 11
Views: 484

Re: PSU question.

Right Having sourced replacement 100µf 250V Caps, and a replacement bridge rectifier I'm ready to try swapping them. So can the beeb PSU be run un-loaded or as is common for most switch mode PSUs do I need to put a load on the +5V line to get the PSU to "switch on". Also I notice the repla...
by Prime
Fri Jun 02, 2017 10:04 am
Forum: hardware
Topic: part list bbc psu ?
Replies: 17
Views: 782

Re: part list bbc psu ?

1024MAK wrote:Yes, the secondary side windings of T2 and T3 are not correct. But the primary windings should be okay.

Mark out of intrest did you ever finish doing the schematic of the secondary side? Would be intrested if so in the PCB files please.

Cheers.

Phill.
by Prime
Thu Jun 01, 2017 6:11 pm
Forum: hardware
Topic: PSU question.
Replies: 11
Views: 484

PSU question.

Hi all, I have an ASTEC model AA12570 PSU that has a fault that I'd like to get fixed if I can. This uint is basically the same as a Beeb PSU except that instead of -5V it outputs -12V. This is from the Dragon Alpha prototype machine. Anyway apart from the normal change the X2 (and possibly startup)...
by Prime
Sun May 28, 2017 9:59 am
Forum: acorn atom
Topic: Prime's ROM/RAM board
Replies: 14
Views: 895

Re: Prime's ROM/RAM board

Hi Prime, I've recently acquired a lovely Atom - great condition and working fine. I've had it modified slightly to run off of steady 5volts. It's completely unexpanded so I'm thinking one of your boards along with the AtoMMC would be the go? Are you able to provide one for me and post to Australia...
by Prime
Fri May 26, 2017 11:18 pm
Forum: hardware
Topic: Length of 1MHz bus cable.
Replies: 3
Views: 232

Length of 1MHz bus cable.

Hi all, I'm about to mount my internal datacentre in one of my masters, but also want it to have the ability to have an external interface such as BeebSID or BeebOPL plugged in at the same time. So what I had thought about doing was to either : 1) Loop the lead either to a socket out the back of the...
by Prime
Fri May 26, 2017 7:56 pm
Forum: off-topic
Topic: CJ Micros
Replies: 5
Views: 380

Re: CJ Micros

danielj wrote:Concur. You will get substantially more bang for your buck if you go to retroclinic...

d.

And won't get your PSU going bang after a few minutes because Mark will have serviced it properly.

Cheers

Phill.
by Prime
Fri May 26, 2017 9:01 am
Forum: software: other
Topic: VT100/ANSI terminal emulation via OSWRCH
Replies: 131
Views: 3722

Re: VT100/ANSI terminal emulation via OSWRCH

That's execllent work, would have been useful a couple of years back when I was trying to get some of the slogger files off an Acorn CP/M disk, It's really useful to be able to write code to handle them on the source platform, and I'm probably more familliar with Turbo Pascal (In that I still use it...
by Prime
Thu May 25, 2017 11:37 pm
Forum: off-topic
Topic: bizzare substitution in private message!
Replies: 18
Views: 598

Re: bizzare substitution in private message!

Perhaps expand to cover all football teams. So as not to be teamist. That could be a long list without further selection...all teams in the world, europe, UK, above a certain division. Since a lot of them contain the name of the town or city they are based in it could make discussing meetup locatio...
by Prime
Thu May 25, 2017 11:05 pm
Forum: hardware
Topic: MaxRAM - New Open Hardware BBC RAM/ROM Board
Replies: 97
Views: 4003

Re: MaxRAM - New Open Hardware BBC RAM/ROM Board

Not used WinCUPL with those perticular chips but I have used it to compile the PALs on the Master Ram board and Plus3 ramrom boards for the Electron, and it is a bug ridden PoS :( I really wish Atmel would release the source code for it if they are not interested in fixing it so someone else could :...
by Prime
Thu May 25, 2017 10:31 am
Forum: off-topic
Topic: bizzare substitution in private message!
Replies: 18
Views: 598

Re: bizzare substitution in private message!

danielj wrote:I suggest you take it up with Arcadian ;) :D

That strikes me as being just a little childish.

Cheers.

Phill.
by Prime
Thu May 25, 2017 9:09 am
Forum: for sale / freebies
Topic: New TEAC floppy drives
Replies: 32
Views: 1137

Re: New TEAC floppy drives

Likewise I'd take a couple, if for no other reason than I can get them now I may not be able to in the future :)

Cheers.

Phill.

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