Search found 733 matches

by sirmorris
Fri May 11, 2018 8:22 pm
Forum: for sale / freebies
Topic: AtomMMC 2.0
Replies: 101
Views: 13600

Re: AtomMMC 2.0

I have boards available. They are built on demand and are usually customised according to the demands of the Atom that they are destined to fit. Feel free to email me at charlie_robson@hotmail.com.

C
by sirmorris
Wed Apr 18, 2018 11:15 am
Forum: for sale / freebies
Topic: Beeb SD card interfaces for sale
Replies: 43
Views: 6105

Re: Beeb SD card interfaces for sale

See first post regarding email address, thanks.
by sirmorris
Mon Jan 22, 2018 10:42 pm
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 63
Views: 2879

Re: My New Acorn Atom :)

// start the clocks CLOCKINIT(); // ensure all ADC channels, comparators are off ADCON1 = 0b00001111; CMCON = 0x07; TRISA = 0b11011111; // enable pullups on port B INTCON2bits.RBPU=0; // Make Port B an input. TRISB = 0xFF; // lights out REDLEDOFF(); GREENLEDOFF(); LEDPINSOUT(); // read config byte ...
by sirmorris
Mon Jan 22, 2018 12:48 pm
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 63
Views: 2879

Re: My New Acorn Atom :)

The green LED indicates an SD card access. If there's no card in the interface it won't initialise, so no irq. IIRC.
by sirmorris
Sun Jan 21, 2018 10:09 pm
Forum: for sale / freebies
Topic: AtomMMC 2.0
Replies: 101
Views: 13600

Re: AtomMMC 2.0

jdavis6809 wrote:Any change of a copy of the source so I can try with the oric / atmos


Sounds like a fun project. Is this for personal enlightenment and education?
by sirmorris
Sun Jan 21, 2018 9:50 pm
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 63
Views: 2879

Re: My New Acorn Atom :)

one thing i noticed is that when the ATOMMC2 is unplugged, the ACORN ATOM + ATOMMC2 never comes up. i will try pulsing the irq line and see if the heading changes to the ATOMMC2 ... :) The interface generates an IRQ at power-on. No interface, no IRQ. No AtoMMC. As you might expect. When the OS ROM ...
by sirmorris
Sun Jan 21, 2018 9:37 pm
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 63
Views: 2879

Re: My New Acorn Atom :)

This is as designed. An error in the PCB means that I need to re-route a pin. It is perfectly normal and nothing to worry about. The chip in question here is an address decoder and it has nothing to do with SD card initialisation, that is handled by the PIC processor. MMC and SD cards are tricky bea...
by sirmorris
Mon Dec 18, 2017 8:16 am
Forum: for sale / freebies
Topic: Beeb SD card interfaces for sale
Replies: 43
Views: 6105

Re: Beeb SD card interfaces for sale

The cable is now integral to the board. It's s tiny bit trickier to put together but it makes more sense.
by sirmorris
Fri Dec 01, 2017 3:16 pm
Forum: acorn atom
Topic: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)
Replies: 23
Views: 1389

Re: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)

Manual linking's no fun though, is it? ;)
by sirmorris
Fri Dec 01, 2017 2:23 pm
Forum: acorn atom
Topic: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)
Replies: 23
Views: 1389

Re: I've got an Acorn Atom... Woot Woot :) (changed title (again) :)

E000 AtoMMC requires a patched FP ROM.
by sirmorris
Thu Nov 30, 2017 9:02 am
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

Flux. Problems at home? Flux. Car won't start? Flux. Toast burned? Flux. Donald Trump? Flux. I could go on.
by sirmorris
Thu Nov 30, 2017 8:02 am
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

Too much solder perhaps? You need only the tiiiiiiiinyiest touch for a tqfp. A bit more for a sodip. And flux. Lots of it. The more toxic the better :lol: Moar colons. I don't tack any more, i just flux up, hold the chip in the right place, touch a tiny bit of solder on the tip. With a wet the tip t...
by sirmorris
Wed Nov 29, 2017 12:47 pm
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

"Mr.Yokoo: Soldering irons will not disappear as long as there are people like you interested in electronic handicrafts.
Hikaru : Yes, indeed. We cannot install a reflow machine in our home.
Mr.Yokoo: That's right. Ha-ha-ha-ha (Laughing)"

=D>
by sirmorris
Tue Nov 28, 2017 2:11 pm
Forum: other vintage computer hardware, software and games
Topic: Lynx Computer
Replies: 11
Views: 1118

Re: Lynx Computer

All I remember about it is that you can have floating point line numbers in basic..

10.1 GO TO 22.3
by sirmorris
Tue Nov 28, 2017 6:47 am
Forum: acorn atom
Topic: Need an AtoMMC board
Replies: 13
Views: 830

Re: Need an AtoMMC board

Yes, still available. Pre-built only though. Disk image support is possible and also the ability to use individual files on the card. There is an (old but still relevant) manual online here. I should really update it :oops:
by sirmorris
Mon Nov 27, 2017 10:11 pm
Forum: acorn atom
Topic: Need an AtoMMC board
Replies: 13
Views: 830

Re: Need an AtoMMC board

waltermixxx wrote:are there two versions of the ATOMMC?

No.

The first prototypes attached to PL7, and were bit-banged using the VIA. There have been no boards made like this for many years. All AtoMMCs are pic-powered.

C
by sirmorris
Thu Nov 23, 2017 3:12 pm
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

Haha actually it's disgusting stuff but I have a good fan ;) Colophony == Rosin.
by sirmorris
Thu Nov 23, 2017 2:55 pm
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

Prime wrote:
sirmorris wrote:I now use a Weller liquid flux


You have a link for that Charlie?


Indeed I do.
by sirmorris
Thu Nov 23, 2017 9:17 am
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

vanpeebles wrote:Erk, I just ordered a flux pen too. A Kester 951?


/me clears throat

I'm sure it'll be fine, they're just not for me and the kind of work I do.
by sirmorris
Thu Nov 23, 2017 9:14 am
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

A couple of you have now mentioned drag soldering, and it's something I've previously watched a video tutorial for. I'm wondering how easy it is, really, for someone who's practiced at soldering and neither ridiculously dextrous nor a klutz? I'm guessing I should pick up a few cheap components to t...
by sirmorris
Thu Nov 23, 2017 9:06 am
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

Re: No-clean flux. It's a misleading name. All flux needs cleaning off if you're interested in how your board looks. The no clean should really be called 'won't damage your board if you leave it on' flux, or 'it's not going to leave an amber residue but you can still see it as a glassy pool on your ...
by sirmorris
Wed Nov 22, 2017 4:01 pm
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

For drag soldering (in fact all soldering these days) I find a nice ellipsoid tip works a charm. Hakko T18-C3 is my go-to choice. The flat area allows you to create some surface tension which pulls the bead of solder along behind it. (Antex #50 ;))
by sirmorris
Wed Nov 22, 2017 12:58 pm
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

I have ordered an XS25. Yaay! With the silicone lead I hope! It is suitable for lead solder? [-o< Hahaha is there any other sort??! :D You probably won't regret buying something like this if you haven't already got one. This one isn't necessarily a recommendation, just the first one that popped up.
by sirmorris
Wed Nov 22, 2017 7:21 am
Forum: off-topic
Topic: Which soldering iron?
Replies: 66
Views: 2729

Re: Which soldering iron?

+1 for Dancap! Before Hakko I always bought Antex. The XS25 is a cracker , and you can get them with ultra-flexible (and heatproof!!) silicone cable for a few quid more. Loads of heat in the tip because of the design where the tip surrounds the element. Nice to hold. Worth every penny. Sits nicely w...
by sirmorris
Tue Nov 21, 2017 2:40 pm
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 631
Views: 41675

Re: ICE T65/Z80/6809

You're a star, Phill!
=D>
by sirmorris
Mon Nov 13, 2017 1:20 pm
Forum: other vintage computer hardware, software and games
Topic: Apple II problem.....
Replies: 6
Views: 498

Re: Apple II problem.....

Is the flag held high too long? Is it being recognised a second time? I think some logic analysing might be called for! To the logic analyser!
by sirmorris
Mon Nov 13, 2017 10:36 am
Forum: other vintage computer hardware, software and games
Topic: Apple II problem.....
Replies: 6
Views: 498

Re: Apple II problem.....

Remind me - are AVR interrupts edge or level triggered?
by sirmorris
Sun Nov 12, 2017 6:31 pm
Forum: acorn atom
Topic: Need an AtoMMC board
Replies: 13
Views: 830

Re: Need an AtoMMC board

8)
by sirmorris
Fri Nov 10, 2017 11:13 pm
Forum: for sale / freebies
Topic: Beeb SD card interfaces for sale
Replies: 43
Views: 6105

Re: Beeb SD card interfaces for sale

This is a pretty decent place to start. https://github.com/hoglet67/MMFS/wiki Most problems are SD card related, try a different one if all looks miserable. Smaller is generally better. Full size is generally better than micro in my experience. FAT16 is a better format than FAT32, anecdotally speaki...
by sirmorris
Fri Nov 10, 2017 9:14 am
Forum: off-topic
Topic: MiniPro TL866 Eprom Programmer
Replies: 11
Views: 728

Re: MiniPro TL866 Eprom Programmer

Another benefit of this little beauty is that there is open source software available for Mac & Linux. It's not GUI, and certainly not fully featured but it works for the most part.

https://github.com/vdudouyt/minipro