Search found 5272 matches

by MartinB
Tue Mar 24, 2020 11:01 am
Forum: stardot.org.uk
Topic: Site Icon
Replies: 6
Views: 453

Re: Site Icon

Nurse!! Ken’s out of bed again....! :shock: 8-[
by MartinB
Mon Mar 16, 2020 12:38 pm
Forum: software: other
Topic: Pascal Roms
Replies: 51
Views: 4918

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: software: other
Topic: Pascal Roms
Replies: 51
Views: 4918

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: software: other
Topic: Pascal Roms
Replies: 51
Views: 4918

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...
by MartinB
Fri Mar 13, 2020 4:50 pm
Forum: software: other
Topic: Pascal Roms
Replies: 51
Views: 4918

Re: Pascal Roms

Just done some Googling and it seems that your experience is not uncommon with that unit when programming older devices. It sounds perhaps as if the delay allocated to the burning of each cell is too short in the software and then, due to a cumulative algorithmic reduction, by location $251 the time...
by MartinB
Thu Mar 12, 2020 11:44 pm
Forum: hardware
Topic: I2C 4 U
Replies: 405
Views: 31682

Re: I2C 4 U

8) 👍
by MartinB
Thu Mar 12, 2020 8:56 pm
Forum: hardware
Topic: I2C 4 U
Replies: 405
Views: 31682

Re: I2C 4 U

No worries Darren 8) While we're about it, this reminds me that the I2C rom isn't technically compatible with a 2P because, for the BASIC % integer variable parameter-passing, the rom directly accesses BASIC's variable storage area at $0400 so that wouldn't work with a second processor. This is actu...
by MartinB
Thu Mar 12, 2020 7:45 pm
Forum: hardware
Topic: I2C 4 U
Replies: 405
Views: 31682

Re: I2C 4 U

It's probably my fault, these things usually are.... :lol: Is that a Model B with a 2P? It looks as if my I2C rom is being initialised twice but I don't know why, possibly something to do with the 2P..... :-k Could you try it without the 2P on and if that doesn't help, without the RamFs (Datacentre?...
by MartinB
Wed Mar 11, 2020 6:45 am
Forum: hardware
Topic: What ports are you using (and how)?
Replies: 18
Views: 588

Re: What ports are you using (and how)?

Tube (External) - Random Co-Pro project use 1MHz Bus - Opus Challenger or BeebSID User Port - UPURS Printer Port - HP Thinkjet Disk Drive Port - Watford Disc Drive Sharer to various 5.25" & 3.5" drives RS423 - NC Cassette Port - Acorn Cassette Deck Econet Port - NC Analogue Port - I2C cable Interna...
by MartinB
Fri Mar 06, 2020 6:30 pm
Forum: software: other
Topic: Pascal Roms
Replies: 51
Views: 4918

Re: Pascal Roms

Any 27128 devices should be fine to be honest, I'm still not sure what's gone awry with yours but somehow you've been unlucky, assuming it isn't yet down to a curious artefact of your programmer. Something like these reclaimed ones are always good value (note often a 12v/21v Vpp mix) - I can't see a...
by MartinB
Fri Mar 06, 2020 12:09 am
Forum: software: other
Topic: Pascal Roms
Replies: 51
Views: 4918

Re: Pascal Roms

Then I’d say that one can only reasonably conclude that your roms are faulty (or at least sub-standard) since the zeroes image check isolates us from any Beeb-related influence.
by MartinB
Thu Mar 05, 2020 11:08 pm
Forum: software: other
Topic: Pascal Roms
Replies: 51
Views: 4918

Re: Pascal Roms

Have you ever used your programmer for ‘retro’ devices before? You say the settings are correct but apart from ‘Enable Beep’, I personally don’t recognise any... :) (I principally use a Dataman S4) Sometimes, older devices need more programming current than modern USB programmers can supply and I no...
by MartinB
Thu Mar 05, 2020 10:04 pm
Forum: software: other
Topic: Pascal Roms
Replies: 51
Views: 4918

Re: Pascal Roms

Erase an eprom to blank, i.e. 16k of FF's, and then try programming the attached 16k zeroes image. 16kzeroes.rom ( btw - 27128's are fine for a Beeb etc. and as long as the physical devices are as you say and do use a 12.5v Vpp then they should program. I have seen folk experience intermittent issue...
by MartinB
Thu Mar 05, 2020 8:36 pm
Forum: software: other
Topic: Pascal Roms
Replies: 51
Views: 4918

Re: Pascal Roms

Can you make an all-zeroes 16k image and see if you can blow that? EPROMs erase to $FF so at the blank stage, they can report as ‘good blanks’ but could actually have faulty stuck bits that cannot be driven to zero by programming. If this is the case, they are broken and cannot be used reliably.
by MartinB
Fri Feb 28, 2020 12:39 am
Forum: off-topic
Topic: info: is there a 8 bit pwm generator chip?
Replies: 2
Views: 176

Re: info: is there a 8 bit pwm generator chip?

Do you want to use a Beeb or just a Pi and Beeb Basic? If the former, search the I2C 4 U thread for ‘PWM’ and you’ll see what goodness can be achieved.... :wink:
by MartinB
Mon Feb 24, 2020 5:07 pm
Forum: hardware
Topic: I2C 4 U
Replies: 405
Views: 31682

Re: I2C 4 U

As Mark suggests, very little hardware resource is required and nothing really that is 'I2C' bespoke as such. On the I/O, I think you [ Mark ] are perhaps mixing up I2C and UPURS because my I2C implementation requires both of the two lines (SDA & SCL) to be bi-directional input-output with both need...
by MartinB
Sat Feb 22, 2020 7:06 pm
Forum: software & utilities for the pc, mac or unix
Topic: Wires? Pah.....
Replies: 908
Views: 137704

Re: Wires? Pah.....

Thanks Stephen, I do remember now and tbh, I never did think it had much value because why on earth would you want simultaneous help info from every rom with it all just scrolling past...? :roll: So Ant, the reason UPURS doesn't respond to *HELP . is because UPURS thinks that command switch is silly...
by MartinB
Sat Feb 22, 2020 2:05 pm
Forum: software & utilities for the pc, mac or unix
Topic: Wires? Pah.....
Replies: 908
Views: 137704

Re: Wires? Pah.....

Hello and thank-you for the feedback, always appreciated! 8) When using a *HELP . command no output is produced by the UPURS v5.1R ROM. *HELP UPURS works as expected. What is *HELP . supposed to do? I must have forgotten over the decades! :-k If no active serial port is connected by a UPURS cable to...
by MartinB
Thu Jan 23, 2020 11:16 pm
Forum: hardware
Topic: Interface robot arm with bbc b
Replies: 7
Views: 318

Re: Interface robot arm with bbc b

Another neat way would be to get an I2C-based DC motor driver module and then control the motors using the Beeb I2C rom package There are lots of such modules available, the price tends to reflect the capabilities of the specific board - this is an example of a straightforward two-motor module.... 7...
by MartinB
Wed Dec 25, 2019 12:58 am
Forum: stardot.org.uk
Topic: Happy Xmas Stardot to you and yours
Replies: 11
Views: 792

Happy Xmas Stardot to you and yours

Merry Xmas and a Happy New Year to everyone! 🎄 🎅 🎁 🎉

Martin 😊
by MartinB
Wed Dec 18, 2019 7:17 pm
Forum: projects
Topic: The well known Bad Apple demo on the Acorn Electron
Replies: 19
Views: 1091

Re: The well known Bad Apple demo on the Acorn Electron

:shock:

Every shade of awesome.... =D>
by MartinB
Mon Dec 09, 2019 6:52 pm
Forum: archive requests
Topic: Pipeline - Superior 51/4" disc V my demo?
Replies: 9
Views: 497

Re: Pipeline - Superior 51/4" disc V my demo?

.....due to the disc image having &FA on some of the tracks / sectors :( As you well know, if UPURS can’t figure what to do with bum sectors and/or tracks when reading a source disc, it defaults to writing bytes of $FA to the image because, given I had to pick some value, I went with FA as an acron...
by MartinB
Wed Dec 04, 2019 3:41 pm
Forum: hardware
Topic: 6502 Assembly on BBC B, what do I need?
Replies: 21
Views: 951

Re: 6502 Assembly on BBC B, what do I need?

If your Beeb has a 177x FDC and you're handy with a soldering iron, you can build a little two chip project which will allow you to use HD 3.5" floppies which are still abundant and freely available.... :)
by MartinB
Sun Nov 17, 2019 1:14 pm
Forum: wanted
Topic: UPURS wanted
Replies: 7
Views: 466

Re: UPURS wanted

Hi - thinking about it, you can probably receive and read PMs so I’ve sent you one with my email address... :)
by MartinB
Sun Nov 17, 2019 12:20 pm
Forum: wanted
Topic: UPURS wanted
Replies: 7
Views: 466

Re: UPURS wanted

Hello again - no problem on a rom and of course I can make a cable (I haven’t any ready in stock) but due to personal bandwidth, it won’t be until one evening this week so you probably wouldn’t see it until the weekend. Could a friendly admin type please enable PMs for Trevor (I assume Trevor? :) ) ...
by MartinB
Sat Nov 16, 2019 11:49 pm
Forum: stardot.org.uk
Topic: Post Edits
Replies: 43
Views: 4081

Re: Post Edits

Etid tied diet deit teid etdi.......EDIT

Just because I can :D

@LOOK@ Rare! No ‘last edited by....’ \:D/

EDIT : And for the 8th time..... :lol:
by MartinB
Sat Nov 16, 2019 11:44 pm
Forum: wanted
Topic: UPURS wanted
Replies: 7
Views: 466

Re: UPURS wanted

I have tried to contact MartinB to purchase either a UPURS utilities 5.25 floppy disc or ROM, as I have no way to create one. He has not replied, so would someone on the forum be able to help me please? :shock: I have received no such contact my friend - I don’t know what comms route(s) you’ve trie...
by MartinB
Mon Oct 28, 2019 6:14 pm
Forum: hardware
Topic: Loading a ROM into SW Ram - basics
Replies: 39
Views: 1266

Re: Loading a ROM into SW Ram - basics

That BASICED 'rom image' isn't a rom image - it looks like its the source code or something, possibly from github or somewhere? I can't tell how you've arrived at the file but it's just wrong! Have you selected the wrong file to download perhaps? For example here's the first few bytes..... <!DOCTYPE...
by MartinB
Mon Oct 28, 2019 9:55 am
Forum: hardware
Topic: Loading a ROM into SW Ram - basics
Replies: 39
Views: 1266

Re: Loading a ROM into SW Ram - basics

If you try both ssd's with the EELOAD utility that Ken Lowe recommended earlier in the thread (and I think you tried?), you will get a checksum after loading a given rom image and this will tell you definitively if there are differences between the alternatively sourced versions of the images.