Search found 4794 matches

by MartinB
Thu Jul 19, 2018 10:12 pm
Forum: general
Topic: Today I received.....
Replies: 4688
Views: 316659

Re: Today I received.....

A brand new still sealed in box typewriter 'thing' Just realised what you have there Col - the Silent 700 and it’s derivatives were used extensively in the defence industry (myself included) throughout the 80’s and well into the 90’s as serial terminals for a variety of computer-based equipment. Wh...
by MartinB
Tue Jul 17, 2018 11:03 pm
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

No worries Darren.... 8) edit: that post above, near the end, links back to a blog post which is pretty interesting as well. Just read it and yes, as you say, a fascinating read and very relevant to our own RTC antics! :D I dont think you mentioned how you intend to attach the RTC to the machine wit...
by MartinB
Tue Jul 17, 2018 9:21 pm
Forum: hardware
Topic: EUPURS and AP5 Cable(s)
Replies: 57
Views: 592

Re: EUPURS and AP5 Cable(s)

Duncan wrote:Handshaking did seem to be working, as far as I could tell.

That’s where I was in the early days with my non-FTDI adaptors until I looked more closely with a scope.....
by MartinB
Tue Jul 17, 2018 9:09 pm
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

To be fair, I did follow the guidelines for the Tube, just not for the relationship between languages and a 2P. However, because my % variable trick massively increases the accessibility of the I2C fun, I bowed down to my pathological need to be a rule-breaker....🤪 Yes, I looked at SPI but preferred...
by MartinB
Tue Jul 17, 2018 9:00 pm
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

Shame it can't work with a second processor though. Actually, I think the I2C rom does effectively work with a 2P (for example *I2CQUERY is fine) but what won’t (can’t) work is my trick of writing I2C parameters directly to BASIC’s integer variables. This is because, perhaps obviously, BASIC itself...
by MartinB
Tue Jul 17, 2018 6:58 pm
Forum: hardware
Topic: EUPURS and AP5 Cable(s)
Replies: 57
Views: 592

Re: EUPURS and AP5 Cable(s)

...but upurs was/is (afaik) particularly persnickety about genuine FTDI cables... UPURS' pernickityness about genuine FTDI devices is only in relation to whether or not RTS/CTS handshaking is correctly driven. My experience during development of the bit-banging engine showed that many non-FTDI USB-...
by MartinB
Tue Jul 17, 2018 12:44 pm
Forum: hardware
Topic: EUPURS and AP5 Cable(s)
Replies: 57
Views: 592

Re: EUPURS and AP5 Cable(s)

Being in mind that the max3232 can do 120kbps if a custom cable for UPURS was created using the max3237 could you increase the rate or is the bottle neck the Electron/Beeb? UPURS constructs RS232 through software bit-banging and so creates one's and nought's on the wires through 6502 instructions p...
by MartinB
Mon Jul 16, 2018 10:25 pm
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

Hello. Firstly, in the clock test program, immediately after each of the three lines with an I2C star command, can you insert another line as follows.... IF ?&67<>0 THEN PRINT”I2C COMMS ERROR” This will tell us if the I2C device is supposedly acknowledging the commands as understood and executed. Th...
by MartinB
Mon Jul 16, 2018 2:31 pm
Forum: hardware
Topic: 2nd User port for Beeb?
Replies: 96
Views: 6198

Re: 2nd User port for Beeb?

I did indeed design BeebSID to fit in to an already very congested and contested page $FC but it significantly pre-dates the second user port and the latter technically conflicts with existing legacy usage but there always has to be pragmatic thinking and compromise with these things.


.
by MartinB
Mon Jul 16, 2018 1:46 pm
Forum: hardware
Topic: 2nd User port for Beeb?
Replies: 96
Views: 6198

Re: 2nd User port for Beeb?

Stephen wrote:Not sure what addresses BeebSID are used at. As long as they don't conflict then they can both be used at the same time.
BeebSID occupies $FC20 - $FC3C
by MartinB
Mon Jul 16, 2018 11:03 am
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

Wow! You are certainly very attentive Duncan :) To be honest, dependant on space in the I2C rom, I’d probably aim to port nearly everything because even on the disc transfer front, the RAMagic! *DOSDFS function requires zero cables or hardware, only a PC with a floppy drive (which can even be a port...
by MartinB
Mon Jul 16, 2018 7:53 am
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

The last one is the type I use in this thread and you'll find all the details in the manual. The second, the DS1307, is the most common one on eBay etc. and is fully compatible with the DS3231 in terms of RTC access so if my thoughts for an internal RTC materialise, any recommendation I make will be...
by MartinB
Sun Jul 15, 2018 8:34 pm
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

I'll be doing the RAMagic! re-work btw - just need an easily accessible RTC (in the software sense) and a good 20K+ of E 2 (which was SRAM with the original RAMagic!). I wanted the (Beeb internal) I2C RTC to need minimal connections to make it more friendly to the masses so I would next have experim...
by MartinB
Sun Jul 15, 2018 8:03 pm
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

Hey, not at all! - if you have a solution underway then by all means take the lead and I'll stand easy! :D What I'd like to do is, assuming an RTC is present with some E 2 , is move many of the RAMagic! features across to the I2C rom. So, be my guest - I'll watch and wait with interest.... 8) (RAMag...
by MartinB
Sun Jul 15, 2018 7:15 pm
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

Nice one Ken, sounds really good =D> - that would presumably be bespoke to a Beeb with the IntegraB present? Interestingly, you can actually have a powered but inactive I2C device sitting transparently on a couple of lines of the User Port because since the I2C device protocol is mandatory open-drai...
by MartinB
Sun Jul 15, 2018 9:08 am
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

Thanks Ken 👍 I’d tried searching but kept drowning in nearly-but-not-quite answers.

Anyway, I2C RTC plan B then.... :-k :wink:
by MartinB
Sat Jul 14, 2018 9:57 pm
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

I have an MMC question - this is the User Port pinout for the I2C interface....

img_0061.png
img_0061.png (71.69 KiB) Viewed 131 times

....but what is the pinout for MMC interface and more specifically, does it use Pin 4, CB2?

(I don’t have MMC before anyone asks!)

Thanks in advance 8)
by MartinB
Sat Jul 14, 2018 4:16 pm
Forum: hardware
Topic: Electron overheating video
Replies: 24
Views: 413

Re: Electron overheating video

Whilst she’s tiddly, negotiate an increase in the household budget for essential Beeb equipment.
by MartinB
Sat Jul 14, 2018 1:03 pm
Forum: hardware
Topic: Electron overheating video
Replies: 24
Views: 413

Re: Electron overheating video

I have often used an ice cube in the finger of a latex glove. Very directable and surprisingly effective.
by MartinB
Sat Jul 14, 2018 11:33 am
Forum: hardware
Topic: Electron overheating video
Replies: 24
Views: 413

Re: Electron overheating video

Understood. You can also use an ice cube in a plastic bag to cool a single chip fairly well. (Use one of the ice cubes from your vodka...😜)
by MartinB
Sat Jul 14, 2018 10:39 am
Forum: software: classic games
Topic: Mega Games Cartridge for the Electron MGC
Replies: 450
Views: 42301

Re: Mega Games Cartridge for the Electron MGC

Ok Dave, let me know when you’ve sent it in case we have problems 👍
by MartinB
Sat Jul 14, 2018 9:40 am
Forum: hardware
Topic: Electron overheating video
Replies: 24
Views: 413

Re: Electron overheating video

Look at the CPC site - I’m pretty sure you will see simply no-frills freezer spray.... :)
by MartinB
Sat Jul 14, 2018 7:12 am
Forum: software: classic games
Topic: Mega Games Cartridge for the Electron MGC
Replies: 450
Views: 42301

Re: Mega Games Cartridge for the Electron MGC

No :shock: :-k

I've just checked through and I've not had an email from you in a goodly while. I'd just assumed Mrs H was still keeping you prisoner in Barnard Castle.... :lol:
by MartinB
Fri Jul 13, 2018 9:15 pm
Forum: software: classic games
Topic: Mega Games Cartridge for the Electron MGC
Replies: 450
Views: 42301

Re: Mega Games Cartridge for the Electron MGC

Did you do anything with the naughty one yet Dave? Is it still heading my way?
by MartinB
Fri Jul 13, 2018 8:19 am
Forum: hardware
Topic: Electron overheating video
Replies: 24
Views: 413

Re: Electron overheating video

...if you have a can of air, aka 'air duster', turn the can upside down and spay this on the chip you suspect. Failing that, put the whole naked board in the air path of a powerful fan. If you have some IPA or another alcohol-based cleaner (or even vodka), put a drop or two on one chip at a time an...
by MartinB
Wed Jul 11, 2018 6:28 am
Forum: general
Topic: Today I received.....
Replies: 4688
Views: 316659

Re: Today I received.....

Slightly off topic, but a new thing to turn into a raspberry pi case. Interesting... it's an inertial nav system display & control head (familiarly INCDU) with that particular Litton example probably being very similar in age to the Beeb. It was a reasonably popular unit and was used in many larger...
by MartinB
Mon Jul 09, 2018 2:35 pm
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

Yeah, I keep looking at the various I2C OLED gadgets around too with a view to having a play but then it would probably just derail all my current project thought trains so by all means, you go for it =D> Remember though that you aren’t going to be wet-nursed with a driver library like the Pi and Ar...
by MartinB
Mon Jul 09, 2018 12:14 pm
Forum: hardware
Topic: I2C 4 U
Replies: 169
Views: 12166

Re: I2C 4 U

Just for Martin's pleassure. Why thank-you Duncan, your feedback is most welcome....😊 (For anyone looking-in, the little ditty Duncan is running is just a fag-packet test/demo from the I2C manual and not my attempt at serious clock exploitation software :wink: ) On this subject, I’ve been experimen...
by MartinB
Sat Jul 07, 2018 3:47 pm
Forum: hardware
Topic: Need help figuring out how to fix a couple of Beeb PSUs
Replies: 21
Views: 396

Re: Need help figuring out how to fix a couple of Beeb PSUs

Assuming it’s not the fuse (you’ve checked?), when these PSU’s were re-capped, did you also change the start-up capacitor, C9? If it’s not the fuse and C9 is ok, it /might/ then be the main switching transistor, Q2 (a vertically-mounted TO3 case) but this is a little more of a job to test and then t...