Search found 157 matches

by IanB
Fri Aug 11, 2017 7:13 pm
Forum: other vintage computer hardware, software and games
Topic: UK101 Hardware Modifications Archive
Replies: 12
Views: 409

Re: UK101 Hardware Modifications Archive

I did try this 'no snow' mod a while ago and it did not work at 2 MHz on my UK101 so abandoned it. I couldn't get my UK101 to run at 2Mhz so never tried it but I'm not surprised it doesn't work as it relies on both the character clock of the video system and the CPU running at 1Mhz so they can both...
by IanB
Fri Aug 11, 2017 4:58 pm
Forum: other vintage computer hardware, software and games
Topic: UK101 Hardware Modifications Archive
Replies: 12
Views: 409

Re: UK101 Hardware Modifications Archive

I previously posted this in another thread but as you are collecting mods in one place, here's my "no snow" modification which was published in the December 1981 issue of PC World:

PCWpage147.jpg

This mod might not work when running the CPU at 2Mhz
by IanB
Thu Sep 29, 2016 6:45 pm
Forum: software: other
Topic: The Artist by Wigmore House
Replies: 27
Views: 1415

Re: The Artist by Wigmore House

Has anyone got a manual for 'The Artist' by Wigmore House please. It's not online anywhere....only the rom. I didn't write 'The Artist' but I converted it for the Commodore 64. As a result I still have all the original source files for the BBC version including the draft manual in Wordwise format. ...
by IanB
Wed Sep 21, 2016 4:41 pm
Forum: hardware
Topic: Utterly weird Model B vs Master 128 timing issue
Replies: 23
Views: 959

Re: Utterly weird Model B vs Master 128 timing issue

On my Master 128, the timing is almost (but not entirely OK). However, on my Model B, I noticed that it was running rather slow. At first, I wondered whether it was something to do with the hardware in my Model B (which has been having a variety of issues). However, my Master 128 has a multi OS ROM...
by IanB
Tue Sep 20, 2016 6:28 pm
Forum: hardware
Topic: Finding a genuine Sandisk 512MB card
Replies: 21
Views: 1212

Re: Finding a genuine Sandisk 512MB card

steve3000 wrote:Ian, did you get those converters working using the Wizzo ROM?


Yes that type of converter does work in an A5000 with the Wizzo ROM but not using the native RISCOS drivers (I got broken directory all the time)
However I stopped using the Wizzo ROM because of the command line path bug.
by IanB
Tue Sep 20, 2016 9:59 am
Forum: hardware
Topic: Finding a genuine Sandisk 512MB card
Replies: 21
Views: 1212

Re: Finding a genuine Sandisk 512MB card

DutchAcorn wrote:
topcat96 wrote:@DutchAcorn
Ever considered using an adaptor?

Thanks Topcat, I'll try that.


I've tried those adapters but they don't work on my A5000. They do work well on my two RISC PCs.
by IanB
Tue Aug 09, 2016 5:20 pm
Forum: hardware
Topic: Acorn System FPGA
Replies: 6
Views: 711

Re: Acorn System FPGA

I'm wonder what, if any, other software exists that might run on this? The only System software I have is the level 2 econet file server: system5.jpg Here's the ROM image and file server software. Sys5RomFS.zip Edit: Forgot to mention the ROM image is 8K and the first 4K is the Econet driver (E000-...
by IanB
Sat Jul 30, 2016 10:13 pm
Forum: general
Topic: [VIDEO] What were your worst tape loading issues?
Replies: 9
Views: 557

Re: [VIDEO] What were your worst tape loading issues?

About 10 years ago I bought a couple of old untested ZX80 game tapes off ebay which were for flicker free games. These weren't available online anywhere and quite rare at the time. Unfortunately although they sounded OK they were completely unreadable by the ZX80 and adjusting the azimuth didn't hel...
by IanB
Sat Jul 23, 2016 10:03 pm
Forum: hardware
Topic: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor
Replies: 29
Views: 2259

Re: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor

Wonder if it works with an amstrad CPC. It would need some interface circuitry which I am working on at the moment. As mentioned above, the RGB signals on the VGA input require some filtering to get rid of aliasing effects and I'm experimenting with that. Also the VGA input needs TTL level sync sig...
by IanB
Sat Jul 23, 2016 9:26 pm
Forum: hardware
Topic: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor
Replies: 29
Views: 2259

Re: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor

Any chance these can be made to work on an ARM250 machine? I've always wanted to overclock the VIDC core :D I've already used paulv's boad with the adafruit module on my A4000 which is ARM250 based so that should work on other ARM250 machines. see these posts above: http://stardot.org.uk/forums/vie...
by IanB
Thu Jul 07, 2016 6:38 pm
Forum: hardware
Topic: Fettling an A3000 and now it's overly fast...
Replies: 15
Views: 838

Re: Fettling an A3000 and now it's overly fast...

I'm actually coming to the conclusion that the 24MHz oscillator is running a little bit fast That shouldn't make much difference as the memory/cpu cycles and the timer used to measure that are all derived from the same 24 Mhz crystal so if it's running 10% fast, the cpu will be 10% faster but the t...
by IanB
Wed Jul 06, 2016 5:16 pm
Forum: hardware
Topic: Fettling an A3000 and now it's overly fast...
Replies: 15
Views: 838

Re: Fettling an A3000 and now it's overly fast...

I notice that DRAM refresh is set to "None". The MEMC datasheet indicates it can be set to none for high resolution modes but on my machines it shows as "During Video Flyback only (4uS)" in all modes unless I use the option to disable the video during the test in which case it sh...
by IanB
Mon Jul 04, 2016 7:11 pm
Forum: hardware
Topic: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!
Replies: 56
Views: 2578

Re: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...!) and CF/SD adaptors

someone posted on here a while back about a similar issue with the ICS podule. I found that thread: http://www.stardot.org.uk/forums/viewtopic.php?f=16&t=8007 which leads here: https://groups.google.com/forum/#!topic/comp.sys.acorn.hardware/lumceUFWkXY And that indicates it can be caused by mis...
by IanB
Sun Jul 03, 2016 4:06 pm
Forum: hardware
Topic: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!
Replies: 56
Views: 2578

Re: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...!) and CF/SD adaptors

Great to hear it's also been successful for you Ian! It seems to work fine with apps but I'm having a wierd problem with changing folders from the command prompt. e.g. if I hit f12 and type *dir $.modes.new (which is a valid path) and then *. the folder I get no files found and it looks like the pa...
by IanB
Thu Jun 30, 2016 11:15 pm
Forum: other vintage computer hardware, software and games
Topic: UK101 Premier Publications BASIC 6
Replies: 20
Views: 1230

Re: UK101 Premier Publications BASIC 6

This is definitely MIA and would be much appreciated. Here is WEMON + manual WEMON.zip It has a PET-like full screen editor and saves programs to tape with filenames among it's features but it isn't very compatible with existing software. I ended up making it switchable on my UK101 so I could rever...
by IanB
Wed Jun 29, 2016 11:28 pm
Forum: other vintage computer hardware, software and games
Topic: UK101 Premier Publications BASIC 6
Replies: 20
Views: 1230

Re: UK101 Premier Publications BASIC 6

As far as I know I haven't anything that can read a 2K EPROM so that I can post the code. You could connect the tape output of the UK101 to the line input of a PC and save the memory area of the eprom and post the audio file. I expect there is software out there to decode that back to the original ...
by IanB
Wed Jun 22, 2016 9:00 pm
Forum: hardware
Topic: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor
Replies: 29
Views: 2259

Re: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor

I just discovered the Benq monitor will work with composite sync on the VGA input and as a result works with a BBC micro as well: bbcbenq.jpg It has the same sample rate issue as the Archimedes and unfortunately that can't be fixed with the adafruit board because the beeb's dot clock has to be a mul...
by IanB
Mon Jun 20, 2016 10:11 pm
Forum: hardware
Topic: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor
Replies: 29
Views: 2259

Re: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor

*TUNING may fix it. It won't correct hardcoded trackers that replace the Channel Handler, but will adjust Voices okay - assuming they're using the pitch value passed by SoundChannels. It does look like *TUNING would fix voices but not soundtracker type players. I also tried writing directly to the ...
by IanB
Sun Jun 19, 2016 9:51 pm
Forum: hardware
Topic: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor
Replies: 29
Views: 2259

Re: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor

I've now converted the last of my machines, an original A440 with RISC OS 2. I did consider upgrading this machine to RISC OS 3 but there seemed little point as I already have 3 other machines with that so I think it's more interesting to keep it with the original OS. As RISCOS 2 doesn't have any na...
by IanB
Sat Jun 18, 2016 1:55 pm
Forum: hardware
Topic: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!
Replies: 56
Views: 2578

Re: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...!) and CF/SD adaptors

I wonder if this ICS Wizzo ROM may actually result in better compatibility with SD->IDE interfaces on the A5000/A4 - since IDEFS has no problems with newer SD->IDE interfaces, where ADFS fails. I just programmed the Wizzo image into a 27512 EPROM and fitted it to the 5th column ROM socket on my A50...
by IanB
Fri Jun 17, 2016 8:04 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 963
Views: 68477

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10?

That's really nice =D> Finally, note that Dave is pushing ahead even now with another feature of the same hardware: using the Pi, and even the Pi's GPU, to provide a cheap and convenient VGA output for an Atom. Would it be possible to emulate a 1 Mhz bus device in a similar way? If so it might be po...
by IanB
Fri Jun 17, 2016 7:46 pm
Forum: hardware
Topic: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!
Replies: 56
Views: 2578

Re: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...!) and SD->IDE adaptors

Have you managed to burn RO 3.11 roms for ARM250 machines like the A3010 that have the large 42-pin roms? I had hoped to use M27C160 but they don't seem to work :( I haven't tried it yet but will be doing so in the future. M27C160 EPROMs are double the required size and are suitable for RISC PC, I ...
by IanB
Thu Jun 16, 2016 7:16 pm
Forum: hardware
Topic: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!
Replies: 56
Views: 2578

Re: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...!) and SD->IDE adaptors

This is a rather good idea. -> I've never really looked into "roll your own" ROMs for RiscOS - is there there any documentation about how they're laid out? I have rolled my own RISCOS ROMs on a RISCPC for versions 3.71 and 4.0 when I was working on the Econet podule. It was a couple of ye...
by IanB
Thu Jun 16, 2016 6:30 pm
Forum: other vintage computer hardware, software and games
Topic: TRS80 Model 1 PSU.....
Replies: 13
Views: 872

Re: TRS80 Model 1 PSU.....

You need 1x Acorn Electron PSU to provide the 18V AC input. 1x Laptop DC supply to provide 15 to 19 Volts DC.. Simply wire these to the appropriate pins on the 5 pin Din Plug and then most importantly tie the laptop supplies ground to one side of the 18V AC output from the Elk supply, without this ...
by IanB
Wed Jun 15, 2016 7:22 pm
Forum: other vintage computer hardware, software and games
Topic: TRS80 Model 1 PSU.....
Replies: 13
Views: 872

Re: TRS80 Model 1 PSU.....

Looking at the schematic it seems that the 14VAC is straight away rectified and then regulated to generate the +5V and -5V lines. So I am wondering could I get away with supplying DC on both inputs. In this scenario obviously one set of diodes in the bridge would always be on and the other always o...
by IanB
Tue Jun 14, 2016 5:09 pm
Forum: hardware
Topic: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor
Replies: 29
Views: 2259

Re: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor

is your 440/1 a later model motherboard that doesn't require the SoG fix or have you just cut the pin on the 7438 on the motherboard? I originally cut the leg on the 7438 but it now uses the link on your board to control SoG I'm a bit confused regarding the Sync signals though. In the photo's I don...
by IanB
Tue Jun 14, 2016 12:03 am
Forum: hardware
Topic: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor
Replies: 29
Views: 2259

Re: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor

I've now got this working on my A440/1: Previously this had a Watford Electronics VIDC enhancer which I had modified to work natively with RISCOS 3.1 by adding in the VIDC crystal selection and Sync polarity latch used by later machines like the A5000. As it was somewhat difficult to add the adafrui...
by IanB
Sun Jun 12, 2016 7:39 pm
Forum: software: other
Topic: Art Software
Replies: 24
Views: 1650

Re: Art Software

Firstly (this is pretty random) - can anyone recall seeing a review about 'The Artist' from Wigmore House The Artist was written by a friend of mine and I converted it to work on the Commodore 64 (the '64 version was also published by Wigmore House). It was a mode 2 paint program and was mouse driv...
by IanB
Fri Jun 03, 2016 10:56 pm
Forum: hardware
Topic: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor
Replies: 29
Views: 2259

Re: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor

I finalised the A4000 version of the clock generator and it has the following differences compared to the original A5000 version: I changed R3 to 470ohms (Although I used 1K initially, I thought that was a bit too high so I replaced it with a 1K pot and adjusted it for the lowest value to eliminate ...
by IanB
Thu Jun 02, 2016 7:25 pm
Forum: hardware
Topic: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor
Replies: 29
Views: 2259

Re: 1024x768 and 15KHz TV modes on an A5000 with BenQ BL912 monitor

Obviously, having the VIDC board as close as possible to the genlock header is desirable. The board could be mounted in a similar way to the Watford VIDC enhancer if needed to shorten the connections to the minimum but I've not seen significant issues on the older Arcs with clock connectors that ar...

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