Search found 5327 matches

by MartinB
Tue Sep 22, 2020 8:18 pm
Forum: programming
Topic: Loading files at &400
Replies: 2
Views: 74

Re: Loading files at &400

That should be fine as long as BASIC is ‘off’ and not being used. Can you temporarily load the data somewhere else, say &0900-&0AFF or higher up in memory (but below screen mem) to see if it is a location problem?
by MartinB
Wed Sep 16, 2020 6:58 am
Forum: wanted
Topic: (Found) Wanted - EdWord ROM
Replies: 5
Views: 151

Re: Wanted - EdWord ROM

Dave wrote:Can you work out what the C (and also the E) stand for now ... boyo? ;)

Chinese and Emakhuwa ? :-k


(I can’t believe how difficult it is to find a language other than English that begins with ‘E’...... :lol: )
by MartinB
Tue Sep 15, 2020 10:20 pm
Forum: wanted
Topic: (Found) Wanted - EdWord ROM
Replies: 5
Views: 151

Re: Wanted - EdWord ROM

For eprom blowing - no idea of the differences between the versions.

Just added more, maybe the ‘E’ versions are Electron?

.
by MartinB
Tue Sep 15, 2020 5:38 pm
Forum: 8-bit acorn hardware
Topic: Following in the footsteps...
Replies: 4
Views: 297

Re: Following in the footsteps...

Sounds fascinating Stephen, keep us posted! :) One minor point, I have subsequently discovered that because the MOS obviously shares the same system 6522 lines as I have used for my I2C, if you mess with keyboard during certain I2C accesses, you can corrupt a transfer. I can’t ‘break’ anything as su...
by MartinB
Mon Sep 14, 2020 11:20 pm
Forum: for sale / freebies
Topic: Ribbon Cables
Replies: 12
Views: 444

Re: Ribbon Cables

I guessed so because I’ve had that particular feature forever - back in the day and now, it’s still an essential on all my floppy drive pairs. It’s particularly useful for 35/525 combo units because I tend to use 35s for everyday stuff due to their robustness but still have lots of bootable 525s kno...
by MartinB
Sun Sep 13, 2020 9:18 pm
Forum: for sale / freebies
Topic: Ribbon Cables
Replies: 12
Views: 444

Re: Ribbon Cables

And for an extra twist, could you break out the line which selects which one would be drive 0 and which one would be drive 1 ? I could be wrong, but I took that as a metaphorical ‘twist’ and that 8271 just wants those wires broken-out to facilitate the fitting of an id changeover switch to allow ei...
by MartinB
Sat Sep 12, 2020 7:23 pm
Forum: 8-bit acorn hardware
Topic: loading UEF images into the Elk with UPCFS on EUP
Replies: 58
Views: 6377

Re: loading UEF images into the Elk with UPCFS on EUP

Well done Roland (and Dave)! That tweak could well have fixed other games - Dave mentioned Freefall for example (did you try that too btw Roland?), but unless one individually and ‘scientifically’ failure-analyses every non-working game, extending the ‘working’ list of games can just amount to a bul...
by MartinB
Fri Sep 11, 2020 9:58 am
Forum: 8-bit acorn hardware
Topic: loading UEF images into the Elk with UPCFS on EUP
Replies: 58
Views: 6377

Re: loading UEF images into the Elk with UPCFS on EUP

Looks fine to me Roland but I’ll let Dave (Hoglet) comment and have the say because he’s offered to do some more testing and tweaking so I’m best not to interfere! :)
by MartinB
Thu Sep 10, 2020 10:27 pm
Forum: 8-bit acorn hardware
Topic: loading UEF images into the Elk with UPCFS on EUP
Replies: 58
Views: 6377

Re: loading UEF images into the Elk with UPCFS on EUP

Dave wrote:BTW, I'm happy to investigate other cases of specific games not working with UPCFS.
That’s perfect Dave! =D>

I’ll just sit back and watch then if that’s ok unless you have any questions but the code is well-commented and, being me, there’s nothing fancy :)
by MartinB
Thu Sep 10, 2020 10:21 pm
Forum: 8-bit acorn hardware
Topic: loading UEF images into the Elk with UPCFS on EUP
Replies: 58
Views: 6377

Re: loading UEF images into the Elk with UPCFS on EUP

Anyway, assuming it was to be unconditional, in the routine ‘ starload ’ as attached, prior to the highlighted line where the Block Flag Byte is being tested for last block, the bottom bit of this same byte ($03CA) should be tested and if set, i.e. file ‘Locked’, make $0258 = 3 as Dave suggests. 032...
by MartinB
Thu Sep 10, 2020 9:50 pm
Forum: 8-bit acorn hardware
Topic: loading UEF images into the Elk with UPCFS on EUP
Replies: 58
Views: 6377

Re: loading UEF images into the Elk with UPCFS on EUP

So, the incompatibility here should be easy to fix in UPCFS - it just needs to test the locked block flag, and set &0258 to &03 accordingly. I can see how/where to do it in the code - unless a lengthy test was carried out to specifically detect Arcadians being loaded, this change would set the <Bre...
by MartinB
Thu Sep 10, 2020 5:56 pm
Forum: 8-bit acorn software: other
Topic: Torch Z80 disc Set - Contents and Format?
Replies: 15
Views: 619

Re: Torch Z80 disc Set - Contents and Format?

You are very kind sir but as you know, your engagement with the project was one of my great motivators for seeing it to the finish and, with your own protection tweaks, you’ve achieved some incredible results =D> It’s still all I’ve ever used - real floppies and UPURS, what else could a person stuck...
by MartinB
Thu Sep 10, 2020 5:49 pm
Forum: 8-bit acorn hardware
Topic: loading UEF images into the Elk with UPCFS on EUP
Replies: 58
Views: 6377

Re: loading UEF images into the Elk with UPCFS on EUP

Thanks Dave, good work! =D> You’re more than welcome to play with UPCFS, the source is posted further up. I kind of ran out of steam and wanted to switch to a full FS rom so that it’s compatibility wasn’t limited by all the sneaky vector stealing but as is often the case, I guess I just ran out of h...
by MartinB
Wed Sep 09, 2020 9:13 pm
Forum: 8-bit acorn software: other
Topic: Torch Z80 disc Set - Contents and Format?
Replies: 15
Views: 619

Re: Torch Z80 disc Set - Contents and Format?

No worries Dave, you are most welcome! 8) You should bob down to Obscurity one day Dave, I’ll show you around the place. It’s fairly quiet and you’ll be completely ignored but if you can draw energy from your inner smug, you’ll be just fine. The main advantage though, because there’s nobody else her...
by MartinB
Tue Sep 08, 2020 12:04 pm
Forum: 8-bit acorn hardware
Topic: Recommended BBC Model B upgrades
Replies: 50
Views: 1108

Re: Recommended BBC Model B upgrades

Martin B is selling some kit for this.
He is? :shock:
by MartinB
Sat Sep 05, 2020 6:33 pm
Forum: programming
Topic: Programming a delay in assembly language
Replies: 12
Views: 397

Re: Programming a delay in assembly language

Stewie small.gif
Stewie small.gif (16.57 KiB) Viewed 151 times
by MartinB
Sat Sep 05, 2020 3:33 pm
Forum: programming
Topic: Programming a delay in assembly language
Replies: 12
Views: 397

Re: Programming a delay in assembly language

No worries Roland, it's my own fault - I decided many years ago not to post code on here anymore because its always too stressful but, a simple delay sounded seductively easy so I dropped my guard.... #-o :lol: (That's also the reason why you have to ask to see any of my project sources Roland, I'll...
by MartinB
Fri Sep 04, 2020 11:28 pm
Forum: programming
Topic: Programming a delay in assembly language
Replies: 12
Views: 397

Re: Programming a delay in assembly language

A pause between messages in a text adventure doesn’t require millisecond accuracy and as I specifically said in my post, I was suggesting code that was hardware agnostic other than an assumtption of CPU clock speed. I also explicitly pointed out that for different processor clock speeds, you can var...
by MartinB
Fri Sep 04, 2020 7:32 pm
Forum: programming
Topic: Programming a delay in assembly language
Replies: 12
Views: 397

Re: Programming a delay in assembly language

No worries - you could also add a vdelay label at the STA wcount [/i] and then for variable delays, just perform LDA #nn , JSR vdelay in your main code to get variable delays. So if 6 is about right for 1 second, doing LDA #60 , JSR vdelay for example would give you a 10s delay if you wanted such fl...
by MartinB
Fri Sep 04, 2020 6:57 pm
Forum: programming
Topic: Programming a delay in assembly language
Replies: 12
Views: 397

Re: Programming a delay in assembly language

From some of my code, I /think/ the lower delay routine of 256 X by 256 Y is about 0.16s at 2MHz so at bigwait , setting wcount to 6 as shown would give about a second but you can easily have a play with that specific number and see what you get. Note that as it stands, it trashes all the registers ...
by MartinB
Thu Sep 03, 2020 9:03 pm
Forum: off-topic
Topic: Pin connector layout for original Gotek LED 7-segment?
Replies: 11
Views: 323

Re: Pin connector layout for original Gotek LED 7-segment?

Found this Stephen, see bottom left.....

9CAA87E5-2FC4-4470-A216-04B894AF4A57.jpeg
by MartinB
Thu Sep 03, 2020 6:45 pm
Forum: 8-bit acorn hardware
Topic: Wobbly Clock
Replies: 9
Views: 385

Re: Wobbly Clock

Looks perhaps more like a scope threshold triggering issue? I would have expected a simple varying frequency trace to be stable and fixed at the left but slightly 'stretching' and 'contracting' on the right?
by MartinB
Thu Sep 03, 2020 12:02 pm
Forum: off-topic
Topic: Pin connector layout for original Gotek LED 7-segment?
Replies: 11
Views: 323

Re: Pin connector layout for original Gotek LED 7-segment?

I realise you were hoping for the quick answer but I was thinking perhaps you could buzz out the pin connections knowing the interface chip and Ian has posted the pinout. If no answer is forthcoming, you can perhaps do that.
by MartinB
Thu Sep 03, 2020 11:20 am
Forum: off-topic
Topic: Pin connector layout for original Gotek LED 7-segment?
Replies: 11
Views: 323

Re: Pin connector layout for original Gotek LED 7-segment?

Ah, ok Stephen. Is there another chip on there besides the 3-digit display? The latter modules don’t normally have I2C built-in.
by MartinB
Thu Sep 03, 2020 9:42 am
Forum: off-topic
Topic: Pin connector layout for original Gotek LED 7-segment?
Replies: 11
Views: 323

Re: Pin connector layout for original Gotek LED 7-segment?

Hi Stephen - I don’t know if the Micro-Gotek that I have uses the same bits and pieces but in the picture below, Blue is SDA, Green is SCL, Yellow is Vcc and Orange is GND and those are top to bottom on the display module. 497A84C5-C78F-4949-97FF-77C62B8B7928.jpeg By the way Stephen, if you’re messi...
by MartinB
Sat Aug 29, 2020 9:33 pm
Forum: 8-bit acorn software: other
Topic: Torch Z80 disc Set - Contents and Format?
Replies: 15
Views: 619

Re: Torch Z80 disc Set - Contents and Format?

Dave wrote:Getting UPURS working (again) is a background task....
No worries at all Dave 8) - I’ve watched a lot of floppy disc dramas unfold over the years and mostly, I just keep quiet but just thought I’d mention it in case you’re struggling :)
by MartinB
Fri Aug 28, 2020 9:09 pm
Forum: 8-bit acorn software: other
Topic: Torch Z80 disc Set - Contents and Format?
Replies: 15
Views: 619

Re: Torch Z80 disc Set - Contents and Format?

With UPURS, you can make (or duplicate) the Torch CPN discs in a matter of minutes...... :-
by MartinB
Thu Aug 27, 2020 1:48 pm
Forum: 8-bit acorn hardware
Topic: 3.5 inch drives problem
Replies: 22
Views: 591

Re: 3.5 inch drives problem

If you haven't already done so, are you able to try just one of the 3.5" drives connected to the Beeb with no other drive on the cable? I'm just wondering about possible termination issues. (You will need to stay with DFS 1.22 though.)
by MartinB
Wed Aug 26, 2020 7:34 pm
Forum: 8-bit acorn hardware
Topic: 3.5 inch drives problem
Replies: 22
Views: 591

Re: 3.5 inch drives problem

flaxcottage wrote:In order to get 3.5" disks working you could try a modified DFS with the 8271; it may or may not work.
DFS 1.22 that he's tried is the 3.5" patched version.
by MartinB
Wed Aug 26, 2020 9:50 am
Forum: 8-bit acorn hardware
Topic: ! ! 3 1/2" PC Drive/s on a beeb ! !
Replies: 165
Views: 91632

Re: ! ! 3 1/2" PC Drive/s on a beeb ! !

Presumably you’re talking Elk and this style of AP3? E03A860F-CF7E-4834-99B6-E97CBF6F5F3B.jpeg Assuming yes, Pin 1 is nearest the outer edge of the cartridge module, so under the ‘ACP’ of the yellow label on mine in the photo. On yours, you should just be able to make out a small arrow (triangle) mo...

Go to advanced search