Search found 5356 matches

by MartinB
Thu Mar 12, 2020 8:56 pm
Forum: 8-bit acorn hardware
Topic: I2C 4 U
Replies: 409
Views: 44618

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: 8-bit acorn hardware
Topic: I2C 4 U
Replies: 409
Views: 44618

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: 8-bit acorn hardware
Topic: What ports are you using (and how)?
Replies: 18
Views: 1345

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: 8-bit acorn software: other
Topic: Pascal Roms
Replies: 51
Views: 7057

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: 8-bit acorn software: other
Topic: Pascal Roms
Replies: 51
Views: 7057

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: 8-bit acorn software: other
Topic: Pascal Roms
Replies: 51
Views: 7057

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: 8-bit acorn software: other
Topic: Pascal Roms
Replies: 51
Views: 7057

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: 8-bit acorn software: other
Topic: Pascal Roms
Replies: 51
Views: 7057

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: 505

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: 8-bit acorn hardware
Topic: I2C 4 U
Replies: 409
Views: 44618

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: 165009

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: 165009

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: 8-bit acorn hardware
Topic: Interface robot arm with bbc b
Replies: 7
Views: 732

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 FORUM
Topic: Happy Xmas Stardot to you and yours
Replies: 11
Views: 1522

Happy Xmas Stardot to you and yours

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

Martin 😊
by MartinB
Mon Dec 09, 2019 6:52 pm
Forum: archive requests
Topic: Pipeline - Superior 51/4" disc V my demo?
Replies: 9
Views: 1257

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: 8-bit acorn hardware
Topic: 6502 Assembly on BBC B, what do I need?
Replies: 29
Views: 2236

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: 919

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: 919

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 FORUM
Topic: Post Edits
Replies: 43
Views: 6036

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: 919

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: 8-bit acorn hardware
Topic: Loading a ROM into SW Ram - basics
Replies: 40
Views: 2925

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: 8-bit acorn hardware
Topic: Loading a ROM into SW Ram - basics
Replies: 40
Views: 2925

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.
by MartinB
Sun Oct 27, 2019 7:56 am
Forum: 8-bit acorn hardware
Topic: Master 128 Speaker noise
Replies: 6
Views: 840

Re: Master 128 Speaker noise

Mark wrote:Try using the search box to find other posts / threads about this.

Or look at the post just above Mark's.... :shock: :lol:
by MartinB
Sat Oct 26, 2019 10:24 pm
Forum: 8-bit acorn hardware
Topic: Master 128 Speaker noise
Replies: 6
Views: 840

Re: Master 128 Speaker noise

Have a look at this thread :)
by MartinB
Sun Oct 20, 2019 11:31 am
Forum: 8-bit acorn hardware
Topic: Master thinks a Joystick is plugged in and active
Replies: 17
Views: 1128

Re: Master thinks a Joystick is plugged in and active

tricky was asking for the ADVAL(0)AND3 test because that returns the state of the fire buttons and your value of 1 means that the player one fire button is permanently indicating pressed which will indeed cause games to assume this has been intentionally selected by the user. If this is occurring w...
by MartinB
Thu Oct 17, 2019 6:44 am
Forum: for sale / freebies
Topic: Hampshire/South ABUG Giveway
Replies: 16
Views: 1908

Re: Hampshire/South ABUG Giveway

That's very kind of you Dave 8) and if it suits Duncan better then its fine by me, I'm in no rush whatsoever. We shall let Duncan comment..... :)
by MartinB
Wed Oct 16, 2019 10:11 pm
Forum: for sale / freebies
Topic: Hampshire/South ABUG Giveway
Replies: 16
Views: 1908

Re: Hampshire/South ABUG Giveway

Thank-you and yes, those are the ones I can use. Sincerely though, if you don’t want to post (because I do recognise that it amounts to significant hassle) then no worries at all, I will happily leave them for another taker. However, if you feel that you can take an anti-histamine and bear to confro...
by MartinB
Wed Oct 16, 2019 7:13 pm
Forum: for sale / freebies
Topic: Hampshire/South ABUG Giveway
Replies: 16
Views: 1908

Re: Hampshire/South ABUG Giveway

I try it on a regular basis but despite greasing up, I keep getting stuck in the large letter test slot.

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