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by MartinB
Thu Dec 13, 2018 2:03 pm
Forum: archive requests
Topic: 6502 development system
Replies: 27
Views: 6889

Re: 6502 development system

As I mentioned early in the thread, I've always done all my Beeb (and Elk etc.) software development using the Lancs Assembler, even back in the day. Now, for development cycle speed, I use the PC-based DFS Explorer together with the Lancs Assembler running under BeebEm at x100 speed and employing U...
by MartinB
Wed Dec 12, 2018 10:00 am
Forum: other vintage computer hardware, software and games
Topic: Oric 1 power supply output
Replies: 5
Views: 250

Re: Oric 1 power supply output

It certainly wouldn't hurt though to complete your power integrity checks by running the machine with the covers off and measuring an arbitrary +5v at a point on the board farthest from the PSU input and the 7905 regulator where you should find something very close to 5v, maybe +-0.1v
by MartinB
Tue Dec 11, 2018 9:11 pm
Forum: other vintage computer hardware, software and games
Topic: Oric 1 power supply output
Replies: 5
Views: 250

Re: Oric 1 power supply output

The standard Oric 1 PSU is unregulated and so off-load, yes, I’d expect you to measure much more than 9v and circa 12v isn’t excessive. The Oric itself has an internal solid-state regulator for the unregulated ‘9v’ input which provide the required stable 5v supply.
by MartinB
Tue Dec 11, 2018 8:52 pm
Forum: hardware
Topic: NEC FD1055 jumper settings
Replies: 11
Views: 328

Re: NEC FD1055 jumper settings

Could you post the annotations of the two sets of five jumpers (or perhaps a photo) because there is lots of drive jumper info around and we might be able to figure some of yours using read-across from other models. What is it that you want to do exactly? Are you just wanting to fix the speed at the...
by MartinB
Sat Dec 08, 2018 1:36 pm
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

I’ve just noticed that someone else has downloaded v3.1k from a couple of posts above and I need to stress that this is a special bespoke version for Ken Lowe’s Integra B project and is not my mainstream I2C rom! This version will not work as per the Beeb I2C rom manual! For the mainstream Model B &...
by MartinB
Sat Dec 08, 2018 10:58 am
Forum: hardware
Topic: Strange Pegasus DFS fault
Replies: 33
Views: 606

Re: Strange Pegasus DFS fault

Did you have one of the original boards from me John? (I can't remember!)

Anyway, if so, below is a reminder of where the worst of the tacking problems were.....

Peg track faults (1).jpg

Peg tracking gap issues.jpg
by MartinB
Sat Dec 08, 2018 9:35 am
Forum: hardware
Topic: Strange Pegasus DFS fault
Replies: 33
Views: 606

Re: Strange Pegasus DFS fault

What I can't figure out is how any kind of disk system fault would lead to spurious data getting plastered across the screen though. Any rom or software given authority to write to memory can get it hopelessly wrong if things go awry, even to the point of targeting the screen ram - I only suggested...
by MartinB
Fri Dec 07, 2018 11:33 pm
Forum: hardware
Topic: Strange Pegasus DFS fault
Replies: 33
Views: 606

Re: Strange Pegasus DFS fault

I assume you have UPURS on eprom and on an EUP or an AP5? If so, you can use UPXROM to image the DFS direct to the PC where you can confirm that the rom isn’t corrupt through an image binary compare or checksum. Also, if you put the 6264 ram chip into a writable rom socket (in a cart or whatever), y...
by MartinB
Fri Dec 07, 2018 5:27 pm
Forum: hardware
Topic: Strange Pegasus DFS fault
Replies: 33
Views: 606

Re: Strange Pegasus DFS fault

Col wrote:Never had any problems with mine, but it never sees ADFS as it's utter sh!te :lol
I recognise that Peg, right down to it’s little blue foot! :wink:

You and I appear to agree Col - ADFS = Absolutely Dreadful Filing System :lol:
by MartinB
Fri Dec 07, 2018 11:32 am
Forum: software & utilities for the pc, mac or unix
Topic: Wires? Pah.....
Replies: 866
Views: 114158

Re: Wires? Pah.....

On another thread, John (jms2) mentioned using UPURS on the Electron with his Peg which has reminded me that I need to port the recent Beeb 5.1 updates into the equivalent Elk version. I think that’ll become Elk 1.1E then so just in the off chance that anyone has noticed any additional quirks on the...
by MartinB
Thu Dec 06, 2018 11:40 pm
Forum: general
Topic: Beeb Spotting
Replies: 40
Views: 3914

Re: Beeb Spotting

The ‘Museum of Childhood’ on The Royal Mile, Edinburgh.....


E00DB4E3-143F-4632-94D7-01203C1848FC.jpeg


484F1DF1-DAB7-4294-8B27-392EA4968503.jpeg
by MartinB
Mon Dec 03, 2018 9:57 pm
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

Nice one :D Delete the first image then so it can't ever escape to the wild and I'll remove it from the earlier post. One last point - *NOW $ (but not *NOW) and OSWORD 14 Type 4 (new) will always still produce a 25 character string where the last two digits are temperature but you can just ignore th...
by MartinB
Mon Dec 03, 2018 9:36 pm
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

Here you go Ken - it's only two bytes different from the previous image and one of those is the date going from 02 to 03 :lol:

Let me know when tested, no rush....... 8)


EDIT : 3.1k attachment removed to avoid confusion with mainstream product!


.
by MartinB
Mon Dec 03, 2018 9:07 pm
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

Oh well, it was nearly a full house! :lol: I’ll have a look now, I’m not busy for an hour or so.... :) EDIT : (minutes later) I can see why already! I modified *TBRK to make sure it only toggles bit 0 and doesn't affect the new bit 1 TEMPinh flag but forgot to move the re-write of the new value to t...
by MartinB
Mon Dec 03, 2018 8:41 pm
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

That all seems to be working just fine! Good news! 👍 :D Yes, the two flags are opposites in that bit 0 : ToB is an enable whilst bit 1 : TEMPinh is an inhibit. So, for you, the ‘normal’ state is 0x03 as you have noted which gives time & date on reset with temperature occulted. The three commands I ...
by MartinB
Mon Dec 03, 2018 8:39 am
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

No worries Ken, whenever you have time. Note that since last night I have edited the attachment to be a proper compressed zip file so don't rename it, just unzip as normal.
by MartinB
Mon Dec 03, 2018 12:04 am
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

Here we go Ken, version 3.1K for you to try on your setup. I haven’t been able to test the changes because I don’t have one of your module types and whilst I wrote some DS3231 emulation for BeebEm to test the mainstream versions of the rom, I don’t have time (and it wouldn’t be worth the effort tbh)...
by MartinB
Sun Dec 02, 2018 6:38 pm
Forum: hardware
Topic: Sharing a Disk Drive
Replies: 21
Views: 1539

Re: Sharing a Disk Drive

:shock: :-k

7463AB83-8C03-4920-BCE3-12B741F56223.jpeg
by MartinB
Sat Dec 01, 2018 11:07 pm
Forum: hardware
Topic: Elk ADFS niggles, questions and thoughts.
Replies: 19
Views: 441

Re: Elk ADFS niggles, questions and thoughts.

Daniel wrote:I quite like the feel of an UPURS cable despite having multiple solid-state systems. Reassuringly ribbony.
:-k


:idea:


UPURS.jpg
UPURS.jpg (13.13 KiB) Viewed 126 times


\:D/
by MartinB
Sat Dec 01, 2018 8:41 pm
Forum: hardware
Topic: Elk ADFS niggles, questions and thoughts.
Replies: 19
Views: 441

Re: Elk ADFS niggles, questions and thoughts.

The AP5 has slightly confused things due it’s dedicated UPURS header which, whilst incorporating the necessary passive signal conditioning components, doesn’t have a ‘natural’ COTS cable choice with which to utilise said UPURS header. So, the way to go in all cases is to first buy one of the Troniso...
by MartinB
Fri Nov 30, 2018 2:51 pm
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

Ok Ken, what I think I'll do is use SRAM address $40 as a multi-purpose bit-level control register making say bit 0 the ToB flag and adding bit 1 as a Temperature-Display-Inhibit flag. I won't though add any new star command to access the temperature inhibit flag because it could be easily be set fr...
by MartinB
Thu Nov 29, 2018 1:22 pm
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

Hi Ken It looks as if the changes needed to support the MCP79412 wouldn't be too great as we thought. One thing I notice is that your chip doesn't have an embedded temperature sensor so whilst you could just ignore the *TEMP command, I presume you'd want the ToB display to have that element occulted...
by MartinB
Thu Nov 29, 2018 7:34 am
Forum: introduce yourself
Topic: Hi im new
Replies: 28
Views: 1404

Re: Hi im new

Ah, ok, I'll shut up then.... :lol:
by MartinB
Thu Nov 29, 2018 7:20 am
Forum: introduce yourself
Topic: Hi im new
Replies: 28
Views: 1404

Re: Hi im new

yet one remains in that while you are playing after so many turns it crashes with a too many FORs at line 290 #-o In Program 2 at line 340, the code conditionally jumps out of a FOR-NEXT loop which will always eventually lead to the "Too many FORs" error. Without changing the construct to something...
by MartinB
Wed Nov 28, 2018 11:53 pm
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

Hi Ken and thanks as ever for the encouragement 8) I shouldn’t imagine it would be too difficult at all, I’ll have a study of your datasheet and report back. I have one question - you previously mentioned that you have a special focus on alarm functionality I think? The DS3231 has two alarms but I h...
by MartinB
Tue Nov 27, 2018 8:18 pm
Forum: general
Topic: Today I received.....
Replies: 4928
Views: 349739

Re: Today I received.....

Ah, sorry - my bad. You just need to get each Farnell Order Number and paste it into the CPC site search and you're away! :)

e.g here's the first for example.....



Capture.JPG

(I'm assuming of course that the CPC variant will be ok......?)
by MartinB
Tue Nov 27, 2018 3:33 pm
Forum: hardware
Topic: Elk ADFS niggles, questions and thoughts.
Replies: 19
Views: 441

Re: Elk ADFS niggles, questions and thoughts.

Impressive :D Well, I certainly think so but then I am a little biased to be fair.... O:) Like everything in life, there are a couple of downsides to UPCFS - the first being that not all titles will work accross the system (I think it achieves about 80-90% compatibility on the Beeb and about 70% on...
by MartinB
Mon Nov 26, 2018 10:36 pm
Forum: hardware
Topic: Elk ADFS niggles, questions and thoughts.
Replies: 19
Views: 441

Re: Elk ADFS niggles, questions and thoughts.

But hang on, there's UPURS. I have a modern AP5, I'll need a cable and ROM, hopefully not to difficult to find. Next weekend fun job (hopefully) to explore how this works. Here you go Richard, pictures speak louder etc...... :wink: (Hopefully this is the one you mean, I'm not much of a gamer!) http...
by MartinB
Mon Nov 26, 2018 7:06 pm
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

Who is Peter Griffin... I use a couple of aliases in the internet world - it can be an unpleasant place and sometimes a spot of anonymity can be useful. (Actually, there are occasions when I wish I had an alias on here.... :shock: :roll: :lol:) For Peter Griffin btw, you need to watch Family Guy on...
by MartinB
Sun Nov 25, 2018 9:51 pm
Forum: hardware
Topic: I2C 4 U
Replies: 296
Views: 18461

Re: I2C 4 U

Right folks, it's time to equip yer Beebs and Elks with a clock... :D Here's the 3.1 'RTC' version of the I2C rom attached as a single zip containing : * Beeb (B+) v3.1B 16k rom image (Checksum-32 =$00091906) * Electron v3.1E 16k rom image (Checksum-32 = $0009C486) * A text file showng the above two...