Search found 479 matches

by geraldholdsworth
Sat Jun 22, 2019 1:44 pm
Forum: programming
Topic: RNDX and Master
Replies: 8
Views: 138

Re: RNDX and Master

roganjosh wrote:
Sat Jun 22, 2019 1:12 pm
For completeness, after looking at the disassembly, it looks to me as though RNDX on Basic07 is at $aab0. So the full list is therefore:
And if you read the version string from the ROM you can then compensate for different versions using the same program (i.e. make it multi-platform)

Gerald.
by geraldholdsworth
Tue Jun 11, 2019 4:11 pm
Forum: off-topic
Topic: Trying to wire an RS-422 cable
Replies: 2
Views: 101

Re: Trying to wire an RS-422 cable

So I found this online: 4wire_rs422_fig1.gif Which agrees with what I reckon it should be: AMX DB9 Fostex DB9 RX- 1 RED -> 2 RED !TX TX+ 4 GREEN -> 3 GREEN RX GND 5 BLACK -> 9 BLACK GND RX+ 6 BLUE -> 7 BLUE TX TX- 9 WHITE -> 8 WHITE !RX Should I just take the existing wiring as a red herring and car...
by geraldholdsworth
Tue Jun 11, 2019 3:30 pm
Forum: off-topic
Topic: Trying to wire an RS-422 cable
Replies: 2
Views: 101

Trying to wire an RS-422 cable

Hi all, I have a little quandry, which is nothing to do with Acorns. But I'm asking here because this is full of clever chaps and chapesses, and my brain is turning to mush trying to work this out. I'm trying to wire, for a client, an RS-422 serial cable with DB9 and each end. One end is a Fostex, o...
by geraldholdsworth
Fri May 31, 2019 2:19 pm
Forum: hardware
Topic: Composite video from the BBC
Replies: 23
Views: 442

Re: Composite video from the BBC

EDIT... Now I do know a bit about the differing types of BNC's > https://en.wikipedia.org/wiki/BNC_connector Video (particularly HD video signals) and DS3 Telco central office applications primarily use 75 ohm BNC connectors, whereas 50 ohm connectors are used for data and RF. Many VHF receivers us...
by geraldholdsworth
Fri May 31, 2019 2:17 pm
Forum: hardware
Topic: Composite video from the BBC
Replies: 23
Views: 442

Re: Composite video from the BBC

Was not aware of the different BNC's, I used to have a box of those BNC > Phono adaptors and each machine that appeared would have one attached regardless of if I wanted to use composite or not :lol: simply just as I found a phono cable easier! :oops: We were warned to look out for them, as both ty...
by geraldholdsworth
Fri May 31, 2019 2:00 pm
Forum: hardware
Topic: Composite video from the BBC
Replies: 23
Views: 442

Re: Composite video from the BBC

I'd also like to chip in to say that there are, at least, two different variants of BNCs. There are 75ohm and 50ohm variants, which have different sized centre pins. The 75ohm ones are used for video, and the 50ohm are used for...well, actually, I can't remember - it's been 10 years since I worked o...
by geraldholdsworth
Sat May 25, 2019 10:09 am
Forum: hardware
Topic: Interfacing to AMX Control box
Replies: 0
Views: 82

Interfacing to AMX Control box

NOTE: Nothing to do with the AMX mouse or associated software. Since I bought my AMX NI-4100 master controller (really intended for being a master controller in an Audio/Visual environment), and the few other AMX bits I've since purchased for not much money off Ebay (and the AMX programming course a...
by geraldholdsworth
Fri May 24, 2019 11:16 am
Forum: software
Topic: Disassembler for RISCOS 3.x
Replies: 5
Views: 193

Re: Disassembler for RISCOS 3.x

If you can find it, !ARMalyser. Although, I can't remember if I've used it in RISC OS 3.1 - I've certainly disassembled 3.1 code with it.
by geraldholdsworth
Wed May 22, 2019 8:23 pm
Forum: archive submissions
Topic: Midwich MWFS
Replies: 4
Views: 126

Re: Midwich MWFS

Yep, from their website: Midwich Computer Company Limited formed by David and Ruth Watson. Principal activity was the design and distribution of microprocessors and systems, with particular focus on disk drives for the BBC and Acorn range of home and school computers. Based at Rickinghall, Suffolk....
by geraldholdsworth
Wed May 22, 2019 6:26 pm
Forum: archive submissions
Topic: Midwich MWFS
Replies: 4
Views: 126

Re: Midwich MWFS

Is that the same Midwich as these folk:
https://www.midwich.com
by geraldholdsworth
Tue May 07, 2019 8:18 pm
Forum: hardware
Topic: RiscOS Hard disk formats
Replies: 15
Views: 484

Re: RiscOS Hard disk formats

PS: I've been reading your Delphi disk class I understood the disk layout better by reading code than reading the PDF (Although the PDF did help) The two were written together, so whichever is easier to understand. PPS: I hope you don't mind, but to help me understand better, I converted the ADFS p...
by geraldholdsworth
Tue May 07, 2019 7:37 pm
Forum: hardware
Topic: RiscOS Hard disk formats
Replies: 15
Views: 484

Re: RiscOS Hard disk formats

According to filecore, it's a 60mb version of the same drive. I don't have anything that small, that I know of. The likeliest candidates are: Fujitsu MPD3108AT (10.8GB) Fujitsu MPE3064AT (6.48GB) Seagate ST340015A (16383CYL/16HDS/63SECT - 8GB?) Western Digital WD400 (40GB) Fujitsu MPG3102AT (10.24G...
by geraldholdsworth
Tue May 07, 2019 2:49 pm
Forum: hardware
Topic: RiscOS Hard disk formats
Replies: 15
Views: 484

Re: RiscOS Hard disk formats

Yup, Iv'e had a look, one of my first thoughts when I created the image was "could I do this", but alas I cannot find a compatible drive for sale anywhere. I have a small (well, not so small) collection of hard drives, so might have something you need. What are the specs of the drive you need, and ...
by geraldholdsworth
Mon May 06, 2019 9:10 pm
Forum: hardware
Topic: RiscOS Hard disk formats
Replies: 15
Views: 484

Re: RiscOS Hard disk formats

I wrote a document after I deciphered all the information on ADFS and, hopefully, presented it in a form that was understandable. Mainly so I could remind myself in years to come, but also for others - Here
by geraldholdsworth
Mon May 06, 2019 5:09 pm
Forum: off-topic
Topic: What has happened to Firefox add-ons?
Replies: 24
Views: 559

Re: What has happened to Firefox add-ons?

Why not just download and install Waterfox?
by geraldholdsworth
Mon May 06, 2019 2:29 pm
Forum: emulators
Topic: RPCEmu 0.9.0 and Macs - beta testers wanted
Replies: 74
Views: 4953

Re: RPCEmu 0.9.0 and Macs - beta testers wanted

The only issue I’ve found is that it seems to get stuck thinking you have the mouse down sometimes, possibly if you drag something out of the RPCEmu window. Doing a two finger (adjust?) tap seems to reset it though. I've noticed some issues with the mouse - when I narrow it down (so you can, hopefu...
by geraldholdsworth
Sun May 05, 2019 7:08 pm
Forum: emulators
Topic: RPCEmu 0.9.0 and Macs - beta testers wanted
Replies: 74
Views: 4953

Re: RPCEmu 0.9.0 and Macs - beta testers wanted

OK, got it working now. Thank you.

I'll have a play with it over the next few days and report any issues.

Gerald.
by geraldholdsworth
Sun May 05, 2019 6:56 pm
Forum: emulators
Topic: RPCEmu 0.9.0 and Macs - beta testers wanted
Replies: 74
Views: 4953

Re: RPCEmu 0.9.0 and Macs - beta testers wanted

Can you try this at the command line? This gives one line of debug output when I run it (and then opens the main window and works), so with any luck it'll give you an error message, probably something mentioning /usr/local/opt/qt/lib or /usr/local/Cellar/qt/5.12.1. DYLD_PRINT_LIBRARIES=1 DYLD_PRINT...
by geraldholdsworth
Sun May 05, 2019 5:18 pm
Forum: emulators
Topic: RPCEmu 0.9.0 and Macs - beta testers wanted
Replies: 74
Views: 4953

Re: RPCEmu 0.9.0 and Macs - beta testers wanted

I tried it, but crashed as soon as it opened. I haven't installed QT yet...in fact, what is QT? Where do I get it?

Oh, this is on High Sierra.

Gerald.
by geraldholdsworth
Sun May 05, 2019 10:41 am
Forum: hardware
Topic: Help Needed with 6502 Second Processor
Replies: 18
Views: 602

Re: Help Needed with 6502 Second Processor

My first instinct would be to take the top off the co-pro box and make sure everything is seated OK.
by geraldholdsworth
Thu May 02, 2019 6:39 pm
Forum: acorn atom and system
Topic: Acorn Atom Books
Replies: 76
Views: 11797

Re: Acorn Atom Books

I had two copies of these, so I put one on Ebay a few years back. Was rather surprised when it fetched over 60 quid!!
by geraldholdsworth
Wed Apr 24, 2019 2:47 pm
Forum: programming
Topic: Resident Integer Variables Memory/Address Location
Replies: 4
Views: 161

Re: Resident Integer Variables Memory/Address Location

Second, is there a way to iterate the contents of each resident integer variable in a BASIC loop, without peeking at the memory address? I guess if each resident variable does have a fixed memory address then this would be pretty easy. Something like: 10 FOR i=ASC"A" TO ASC"Z" 20 PRINT CHR$i"%=";EV...
by geraldholdsworth
Mon Apr 22, 2019 5:33 pm
Forum: software
Topic: ADFS Explorer - for Archimedes?
Replies: 4
Views: 260

Re: ADFS Explorer - for Archimedes?

What? Like this?

It is actually a demo, but does open and display any type of adf files (including Amiga ones), and can extract files. Can't put them back onto the image just yet though.
by geraldholdsworth
Sun Apr 21, 2019 11:06 am
Forum: software: other
Topic: Drawing a circle in BBC BASIC
Replies: 50
Views: 2002

Re: Drawing a circle in BBC BASIC

MOVE, DRAW, PLOT and GCOL are easy, as they are just VDU commands.
RAD, COS and SIN are BASIC functions inside the BASIC ROM. You might find it easier to convert one of those listed above that doesn't use these...or use a lookup table created by a BASIC program.
by geraldholdsworth
Sun Apr 14, 2019 8:22 am
Forum: off-topic
Topic: What a waste
Replies: 5
Views: 333

Re: What a waste

In my job, I install new kit. Sometimes, this means taking out the old kit which is no longer required by the client. It is then up to me to dispose of said kit. I'm not allowed to sell the stuff, nor am I allowed to just put it in the bin (due to WEEE regs). I can't dispose of this stuff in our loc...
by geraldholdsworth
Sun Apr 07, 2019 2:00 pm
Forum: hardware
Topic: BBC Master PSU caps, replace?
Replies: 4
Views: 183

Re: BBC Master PSU caps, replace?

EdVoncken wrote:
Sun Apr 07, 2019 1:50 pm
Next up is installing the RetroClinic MultiOS; current year is 19A0 so I need a Y2k fix :D
The RetroClinic MultiOS has the Y2K fix.
by geraldholdsworth
Thu Mar 28, 2019 10:48 pm
Forum: general
Topic: Today I received.....
Replies: 5243
Views: 390880

Re: Today I received.....

With that many inputs and outputs, and the ability to program it, the possibilities are almost endless. After all, the BBC has a serial port and a user port, both of which can communicate with the NI4100. Just needs imagination. For example (and I just thought of this) - I found out today that it ca...
by geraldholdsworth
Wed Mar 27, 2019 9:06 pm
Forum: general
Topic: Today I received.....
Replies: 5243
Views: 390880

Re: Today I received.....

An AMX NI4100 NetLinx controller...OK, nothing to do with Acorn, but a little toy for me to play with and learn to program. Theoretically, it can be programmed to talk to an Acorn machine, via RS232, RS422, RS485 or TCP/UDP over IP. s-l1600.jpg s-l1600 (2).jpg Comes with four, very hard to get hold ...
by geraldholdsworth
Wed Mar 20, 2019 7:48 am
Forum: for sale / freebies
Topic: Want: BBC Master 128 motherboard
Replies: 5
Views: 339

Re: Want: BBC Master 128 motherboard

Or you could post onto 8 bit hardware with the symptoms as there are some damn good experts around here happy to help you out.
by geraldholdsworth
Fri Mar 15, 2019 6:19 pm
Forum: hardware
Topic: Should i get an A3000 or a RISCPC ?
Replies: 36
Views: 1096

Re: Should i get an A3000 or a RISCPC ?

soviet wrote:
Fri Mar 15, 2019 5:49 pm
Seem that all that run on the RISCPC should run fine on the Raspberry PI ?.
Not quite...depending on the OS version. RISC OS 4.39, and previous, is 26 bit but RISC OS 5 is 32 bit so some stuff won't run.