Search found 5358 matches

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: 100884

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...
by MartinB
Tue Aug 25, 2020 7:59 pm
Forum: 8-bit acorn software: classic games
Topic: Acornsoft Maze random maze generation
Replies: 4
Views: 453

Re: Acornsoft Maze random maze generation

This webpage has maze generators in various (most in fact) languages. Specifically, there’s a version for BBC Basic for Windows and one for Qbasic so I’m pretty sure you’ll get what you want here.
by MartinB
Mon Aug 24, 2020 4:48 pm
Forum: 8-bit acorn hardware
Topic: 3.5 inch drives problem
Replies: 22
Views: 1079

Re: 3.5 inch drives problem

Apparently formatting but failing to verify at Track 0 smacks very much of PC (MS-DOS) pre-formatted HD discs. If they are the latter, to have any chance at all, the discs would require bulk erasing but even then, you have an incompatible media anyway for DD use. (There is though a Beeb mod to allow...
by MartinB
Mon Aug 24, 2020 1:07 pm
Forum: 8-bit acorn hardware
Topic: Using an Electron with E2P and User Ports as a sequencer
Replies: 35
Views: 2570

Re: Using an Electron with E2P and User Ports as a sequencer

Fine by me Derek, you go for it my friend 8)
by MartinB
Sun Aug 23, 2020 8:31 am
Forum: 8-bit acorn hardware
Topic: Clock Failure
Replies: 24
Views: 1467

Re: Clock Failure

.....searching around this topic led me back to this very forum and Martin B's I2C ROM! He very kindly sent me the discontinued user port version, but sadly it wouldn't communicate with the dongle. I haven't got onto trying to set the clock, I may have to pull out the setting-the-time code from the...
by MartinB
Sat Aug 22, 2020 9:11 am
Forum: 8-bit acorn hardware
Topic: Master case screws
Replies: 5
Views: 328

Re: Master case screws

You should be able to figure the specs from these, not identical but perfectly fit-for-purpose.... Front : https://cpc.farnell.com/duratool/stpp110zp/screws-self-tapping-pozi-1x10/dp/FN01802?ost=FN01802 Rear : https://cpc.farnell.com/duratool/stpp28zp/screws-self-tapping-pozi-2x8/dp/FN01799?ost=FN01...
by MartinB
Sat Aug 22, 2020 8:52 am
Forum: 8-bit acorn hardware
Topic: Master case screws
Replies: 5
Views: 328

Re: Master case screws

Dave - I think he was asking for the spec such as 'M' number, length etc. so he can buy them locally but without any to start with, he doesn't know what to look for.
by MartinB
Mon Aug 17, 2020 8:38 pm
Forum: 8-bit acorn software: classic games
Topic: Treasures hidden on sloppily mastered discs? (UIM again)
Replies: 14
Views: 1316

Re: Treasures hidden on sloppily mastered discs? (UIM again)

Ooh, if you still have any originals, is it possible you could image them using discbeast in case you have software (or variants) that aren't currently in the archive that Chris is assembling? Hi Dave - highly unlikely in the foreseeable I’m afraid, I just don’t have the bandwidth at the moment. I ...
by MartinB
Sat Aug 15, 2020 10:49 pm
Forum: 8-bit acorn software: classic games
Topic: Treasures hidden on sloppily mastered discs? (UIM again)
Replies: 14
Views: 1316

Re: Treasures hidden on sloppily mastered discs? (UIM again)

This is actually incredibly common - I have imaged countless retail discs over the years using UPURS and the latter has an option to ignore the DFS file structure and unconditionally image all tracks and sectors on a given surface. Indeed, the UPURS manual recommends the use of this option by defaul...
by MartinB
Sat Aug 08, 2020 9:08 pm
Forum: 8-bit acorn hardware
Topic: Clearing EPROMS/EEPROMS
Replies: 57
Views: 2168

Re: Clearing EPROMS/EEPROMS

.
by MartinB
Tue Jul 14, 2020 5:54 pm
Forum: 8-bit acorn hardware
Topic: Marconi RB2 wiring details
Replies: 20
Views: 1152

Re: Marconi RB2 wiring details

What’s that art package you’re using it with Derek?
by MartinB
Tue Jul 14, 2020 2:16 pm
Forum: 8-bit acorn hardware
Topic: Marconi RB2 wiring details
Replies: 20
Views: 1152

Re: Marconi RB2 wiring details

Just photographed the User Port plug on mine and from that and I see....

Red:1 , Orange:2 , Blue:4 , Grey :5 , Black:6 , Brown:8 , White:10 , Yellow:12 , Green:14

rb2 plug.png
by MartinB
Sat Jul 04, 2020 11:13 pm
Forum: introduce yourself
Topic: Hi from BeebControl and Riscy Robots
Replies: 8
Views: 764

Re: Hi from BeebControl and Riscy Robots

Have you seen this project ? With just a few wires and a rom, a Beeb can harness the power of I2C and, as you will doubtless know, this is quite a popular protocol in the robot and control world. Someone recently loaned me an I2C robot arm that he usually controls with some pretty complex and expens...
by MartinB
Sat Jun 20, 2020 12:29 am
Forum: software & utilities for the pc, mac or unix
Topic: Wiring diagram for BBC B RS232 to 25-pin serial?
Replies: 5
Views: 1033

Re: Wiring diagram for BBC B RS232 to 25-pin serial?

The snips below are from the KAM manual and you can determine from these that with reference to the KAM 25-way connector, it receives data into pin 2, transmits data out from pin 3, expects an RTS input into pin 4 and pushes out a CTS signal from pin 5. With that info, it’s a breeze! On the Beeb, Da...
by MartinB
Thu May 28, 2020 11:31 pm
Forum: programming
Topic: Incrementing a 2-byte number
Replies: 14
Views: 1080

Re: Incrementing a 2-byte number

You should see the work MartinB originally did for UPURS and then Dave (hoglet)'s updates. To bit-bang the User Port at 115,200 baud you only have 8.68us per bit, on average! And part of that is spent at 1Mhz 'cos of slow-bus access.... Thank-you Stephen, you are very kind sir! 8) I’m certainly no ...
by MartinB
Sat May 23, 2020 9:58 pm
Forum: stardot FORUM
Topic: New promo/intro video for Stardot!
Replies: 48
Views: 3323

Re: New promo/intro video for Stardot!

I actually first did that animation back when we were looking for a new design but then realised that you only wanted a static logo. I re-animated it the other day when I saw your promo video coz you know me, very old school and like to keep my retro stuff as simple as the innocent time it represent...
by MartinB
Fri May 22, 2020 8:02 pm
Forum: stardot FORUM
Topic: Stardot logo
Replies: 111
Views: 16418

Re: Stardot logo

Happy days Dave.... :D =D>
by MartinB
Fri May 22, 2020 8:00 pm
Forum: stardot FORUM
Topic: New promo/intro video for Stardot!
Replies: 48
Views: 3323

Re: New promo/intro video for Stardot!

Great stuff Dave =D>

However, if it were me, I'd have done this......





Just sayin'..... :-


O:)
by MartinB
Mon May 18, 2020 6:51 pm
Forum: programming
Topic: Real resolution of Mode 7
Replies: 14
Views: 1148

Re: Real resolution of Mode 7

There were many Mode 7 games that used intelligent interleaving of the array of SAA5050 TT chequerboard graphics characters to produce pseudo pixel-resolution games and they were pretty good IMHO. (Unless I'm misunderstanding the discussion....?)

e.g. Arcade Invaders by Acornsoft.....


TTinv.PNG
by MartinB
Fri May 08, 2020 7:04 pm
Forum: 8-bit acorn hardware
Topic: I2C 4 U
Replies: 409
Views: 44996

Re: I2C 4 U

It's not a stupid question by any means and I understand your thinking perfectly 8) However..... whilst it is entirely possible, I wrote the whole package as a rom from the outset and as such, it would be no small job to extract the core protocol routines and re-wrap them in a memory-based program -...
by MartinB
Fri May 01, 2020 6:51 pm
Forum: programming
Topic: Poking to screen memory
Replies: 6
Views: 717

Re: Poking to screen memory

I'm guessing after a cursory look but in line 333, you've got double brackets.... 333bts%=?pltsc%+((offx%*8)) ...which don't do anything above single brackets. So, bts% becomes equal to the contents of pltsc% with offx% x 8 subsequently added to those contents. Did you actually want.... 333bts%=?(pl...
by MartinB
Fri May 01, 2020 6:56 am
Forum: 8-bit acorn hardware
Topic: Help with my first Beeb!
Replies: 17
Views: 1405

Re: Help with my first Beeb!

I've run an early version of MartinB's test code and.... Any reason for using an 'early version' ? If you use the latest one from the post here , it will actually tell you which ram chip (by Beeb IC number) was at fault at the time of the test failure. It's occurred to me that the &55/'U' patte...
by MartinB
Mon Apr 20, 2020 10:07 pm
Forum: 8-bit acorn hardware
Topic: A cool BEEB
Replies: 18
Views: 1666

Re: A cool BEEB

On Beeb temperatures, have a read of this short thread. 🙂
by MartinB
Sun Apr 19, 2020 9:18 am
Forum: off-topic
Topic: Printing on Thingiverse
Replies: 19
Views: 1703

Re: Printing on Thingiverse

Duncan wrote:Now I have the bug....
:shock: 😬 😷
by MartinB
Sun Apr 19, 2020 12:38 am
Forum: 8-bit acorn hardware
Topic: What printer are you still using?
Replies: 14
Views: 957

Re: What printer are you still using?

For everyday transient use during all manner of Acorn tinkering, I use a Casio FP-40 thermal re-chargeable mini-printer with the optional parallel interface module and for longer ‘keeps’ stuff, I use a HP Thinkjet 2225D which has a serial interface. My Casio is shown below with some example printing...
by MartinB
Mon Apr 13, 2020 5:09 pm
Forum: 8-bit acorn hardware
Topic: Random glitch when switching on...
Replies: 24
Views: 1431

Re: Random glitch when switching on...

If you do still have problems, you might like to try hard-wiring the write-enable pin of the AT28C256 to read-only because I have had issues with these chips where, in certain Beebs, at switch-on they can momentarily enter a noise-induced write state where no permanent corruption occurs but the chip...
by MartinB
Tue Mar 24, 2020 11:01 am
Forum: stardot FORUM
Topic: Site Icon
Replies: 6
Views: 1004

Re: Site Icon

Nurse!! Ken’s out of bed again....! :shock: 8-[
by MartinB
Mon Mar 16, 2020 12:38 pm
Forum: 8-bit acorn software: other
Topic: Pascal Roms
Replies: 51
Views: 7135

Re: Pascal Roms

Wow, I didn't expect this to be so hard :( It isn't normally :) Quite simply, all your difficulty is down to your top3000 not being fit for purpose in the context of progamming legacy devices and as I alluded to previously, you are clearly not alone. I can program these and similar devices in a mat...
by MartinB
Sat Mar 14, 2020 1:11 pm
Forum: 8-bit acorn software: other
Topic: Pascal Roms
Replies: 51
Views: 7135

Re: Pascal Roms

You say you "...put the delay down..." but if it is a delay issue, then it will actually need to be going up. Try a much bigger figure, this will slow down the burn but maybe give us a clue.... :-k
by MartinB
Sat Mar 14, 2020 12:11 am
Forum: 8-bit acorn software: other
Topic: Pascal Roms
Replies: 51
Views: 7135

Re: Pascal Roms

In the top3000 installation area of the PC, can you find a text file that has content similar to the below.....? #EPROM-AMD EPR AMD Am2716-12.7V,P27 1 EPR AMD Am2716-21V ,P27 2 EPR AMD Am2716-25V ,P27 3 EPR AMD Am2732-12.7V,P27 4 EPR AMD Am2732-21V ,P27 5 EPR AMD Am2732-25V ,P27 6 EPR AMD Am2764-21V...

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