Search found 543 matches

by dominicbeesley
Sun May 20, 2018 4:55 pm
Forum: hardware
Topic: Screaming CUB monitors
Replies: 8
Views: 283

Re: Screaming CUB monitors

You should try collecting 405 TV's they run at 10Khz which more people can hear. My missus complains if one is on two floors away. 15kHz doesn't seem to bother my 3 year old daughter who watches Peppa pig on my old Decca Bradford TV. Most people became desensitized/used to 15kHz at a young age in th...
by dominicbeesley
Thu May 17, 2018 9:26 am
Forum: hardware
Topic: SASI HDD
Replies: 19
Views: 2175

Re: SASI HDD

I'm afraid I've not done much with SCSI disks. Are you a programmer? Maybe a BASIC program using http://beebwiki.mdfs.net/OSWORD_%2672 and sending the results over the serial port to a PC might be worth a try? I don't know if Phil (Myelin) has any of his serial port cards available - one of these ma...
by dominicbeesley
Wed May 09, 2018 11:07 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 59
Views: 4223

Re: A blitter for the beeb?

Yay FLEX! 20180509_202739-s.jpg This took a bit of work to get going: A 64K linear RAM mode which allows the CPU to address a straight 64K of RAM (switching in 0-8000 from the system when writing to the screen) and a hacked together "mini-MOS" built out of hacked together bits of the 6809 ...
by dominicbeesley
Mon Apr 23, 2018 3:00 pm
Forum: hardware
Topic: SWRAM protection at power down
Replies: 8
Views: 550

Re: SWRAM protection at power down

Yes, I was being over optimistic / stupid, I should have checked it out really. I'd always just assumed that reset _surely must_ get asserted to stop the CPU going daft at switch off and writing to RAM or worse hardware and setting off an erroneous disk write or nuclear war...

D
by dominicbeesley
Mon Apr 23, 2018 10:17 am
Forum: hardware
Topic: SWRAM protection at power down
Replies: 8
Views: 550

Re: SWRAM protection at power down

Thanks Mark, That's kind of what I'd done but I'd assumed that nRESET would go low quickly enough and could use that to then control the chip select signal. [I say kind of what I'd done, I then for some idiotic reason, just before sending the boards off, put in a second inverter that defeated the ob...
by dominicbeesley
Mon Apr 23, 2018 9:54 am
Forum: hardware
Topic: Soldering and Hotair station options
Replies: 31
Views: 1308

Re: Soldering and Hotair station options

This one looks the business https://www.pcb-soldering.co.uk/aoyue-2 ... ation.html

Even looks to have a fume extractor for the soldering iron. I did a lot of soldering this past couple of weeks and the fumes are pretty horrible!

D
by dominicbeesley
Fri Apr 20, 2018 10:52 am
Forum: hardware
Topic: SWRAM protection at power down
Replies: 8
Views: 550

Re: SWRAM protection at power down

Thanks all, This confirms my suspicions. Initially I'd assumed such protection unnecessary - the only SWRAMs I used much were some little Aries(?) plug in single-slot jobbies with no protection and I don't recall them getting corrupted often, if ever. Then again, I probably wouldn't have used them f...
by dominicbeesley
Thu Apr 19, 2018 3:05 pm
Forum: hardware
Topic: SWRAM protection at power down
Replies: 8
Views: 550

SWRAM protection at power down

Hello, I'm having some problems with the SWRAM on the cpu/blit/ram/rom board I'm developing. All works ok until a power-down happens. The processor tends to go a crazy as the power slowly falls off, if a battery backed sideways RAM bank is paged in it can get trampled. The motherboard clock seems to...
by dominicbeesley
Fri Apr 13, 2018 1:03 pm
Forum: hardware
Topic: speaker replacement
Replies: 1
Views: 195

speaker replacement

Hello, To assist developing my soundcard/blitter I've been using an external speaker : 2x4" taken from an old telly in a custom built baffle - well shoved in a cardboard box, connected straight to the beeb's speaker connector. This has served quite well but I decided to try something a bit neat...
by dominicbeesley
Fri Apr 13, 2018 12:44 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 59
Views: 4223

Re: A blitter for the beeb?

Although after watching the video, all I could think of was 'speaker in a cardboard box productions' :lol: I was admiring the Sony reference monitors - very nice! Careful though, you’ll be triggering sbadger’s CRT fetish. :lol: But yes, great work Dominic, very interesting. I've had a bit of a Sony...
by dominicbeesley
Fri Apr 13, 2018 10:17 am
Forum: hardware
Topic: Elk advice
Replies: 14
Views: 561

Re: Elk advice

Yes please,

Most of the keys seem to be ok physically, except for L which was always a pain. I think the misbehaviour was down to the plus1 playing up.

D
by dominicbeesley
Fri Apr 13, 2018 10:09 am
Forum: hardware
Topic: A blitter for the beeb?
Replies: 59
Views: 4223

Re: A blitter for the beeb?

Fair enough Phil, I'll maybe hang on to your board for a while before sending, I've not tried it in the Elk and it may need extra physical tweaks to get it to work... The second / even faster serial port(s) on your board would be super-useful. I'm running HostFS on it for the 6809 and using the ACIA...
by dominicbeesley
Thu Apr 12, 2018 1:03 pm
Forum: hardware
Topic: Elk advice
Replies: 14
Views: 561

Re: Elk advice

Hopefully nothing too invasive for now, just socketing the CPU! and maybe fitting a heatsink to the ULA...
by dominicbeesley
Thu Apr 12, 2018 10:43 am
Forum: hardware
Topic: A blitter for the beeb?
Replies: 59
Views: 4223

Re: A blitter for the beeb?

Thanks lads, I'll certainly look at options for building these, the current board is completely OTT with 1MB of RAM, 512k Flash and the connectors to the breakout board take ages to solder up and are expensive. With surface mount RAM and the FPGA stuck straight to the PCB I hope to get the price dow...
by dominicbeesley
Wed Apr 11, 2018 3:53 pm
Forum: hardware
Topic: Elk advice
Replies: 14
Views: 561

Re: Elk advice

Working now, I slightly more aggressive clean of the plus 1 to elk connector has fixed it (I ended up attacking with emery) this poor thing really has been in the wars. The screws are all showing signs of corrosion and the case is filthy, a surprise it is even trying to work....and now I'm going to ...
by dominicbeesley
Wed Apr 11, 2018 3:41 pm
Forum: hardware
Topic: Elk advice
Replies: 14
Views: 561

Re: Elk advice

Doh!
by dominicbeesley
Wed Apr 11, 2018 3:19 pm
Forum: hardware
Topic: Elk advice
Replies: 14
Views: 561

Re: Elk advice

Thanks lads,

I need to make up another RGB lead! Or maybe S-video...I have a bag full of S-Video sockets that keep looking at me!

Should the Plus 1 ROM and Viewsheet cart show up with *HELP? (My memory is sketchy with regards to the Elk)

D
by dominicbeesley
Wed Apr 11, 2018 3:11 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 59
Views: 4223

Re: A blitter for the beeb?

A quick update. A test board for this was fabricated a few weeks ago and I've built up two so far. The test board can take different CPU's but so far I've only got this working reliably with a 6809 real processor. I've had it working almost with a real 6502A and fairly well with a soft-core 6502A (b...
by dominicbeesley
Wed Apr 11, 2018 11:05 am
Forum: hardware
Topic: Elk advice
Replies: 14
Views: 561

Elk advice

Hello, I've finally dug out my Elk - unused for a quarter of a century from the damp resting place in my workshop. I've been drying it out for a couple of months and decided to fire it up just now. 20180411_114157-s.jpg It surprised me by booting straight up (after I fixed the broken psu lead)...but...
by dominicbeesley
Mon Apr 09, 2018 10:48 am
Forum: hardware
Topic: Soldering and Hotair station options
Replies: 31
Views: 1308

Re: Soldering and Hotair station options

If you don't fancy spending too much money, there are also these: IMG_6695.JPG On eBay . Likely also available elsewhere. Don't know how good they are though. Mark I tried one of those, it was "ok" but slow and cumbersome and not much better than solder wick. After one 40 pin DIP I'd had ...
by dominicbeesley
Tue Mar 20, 2018 1:01 pm
Forum: hardware
Topic: HostFS and microcontrollers?
Replies: 48
Views: 2880

Re: HostFS and microcontrollers?

I'm impressed! I just ported JGH's version of TubeHost to the 6809, I may have to try that with this set up. I think it might be a good time, now there's interest, to try and combine the jgh and upurs versions of the HostFs client. As far as I can tell there's not much in it other than (for some unf...
by dominicbeesley
Thu Mar 15, 2018 10:46 am
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 561
Views: 44621

Re: Palettemate / enhanced video ULA with 4096 colours

I'd be happy to swap ROMs. I presume I need to flash my older Nula (from the first batch) to get the attribute modes working anyway?

D
by dominicbeesley
Wed Mar 14, 2018 11:58 am
Forum: hardware
Topic: Printerface 5
Replies: 4
Views: 312

Re: Printerface 5

I remember, briefly, having access to a ZX printer through my dad's work, though I recall it being one that printed on fax paper instead of the aluminium stuff. I used to it print maps and diagrams for my GCSE/O level Geography project which impressed the teacher! I'd quite like a play with one as i...
by dominicbeesley
Wed Mar 14, 2018 10:07 am
Forum: hardware
Topic: Printerface 5
Replies: 4
Views: 312

Re: Printerface 5

I wonder what the output looked like on a been. Did it use the been font?
by dominicbeesley
Sun Mar 11, 2018 12:21 am
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 561
Views: 44621

Re: Palettemate / enhanced video ULA with 4096 colours

Should the two EOR's not be EOR &F instead of EOR &7

D
by dominicbeesley
Wed Mar 07, 2018 12:09 pm
Forum: hardware
Topic: Will a Wimodem232 work with a Beeb?
Replies: 19
Views: 926

Re: Will a Wimodem232 work with a Beeb?

I'm interested to know is there still and active BBS scene? If so how does one find out where they are?

I'm sure I've still got a few modem's kicking around somewhere...

D
by dominicbeesley
Sat Mar 03, 2018 11:12 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 9236

Re: 6809 experiments

In between re, re, re, re-installing Win 10 I've managed to get a few minutes to look at the new board. It now will run a John Kent vhdl 6809 and boot into the MOS and the bottom SRAM is acting as a big sideways RAM with HostFS loaded into bank 0. Apart from resoldering the reset line it's been pret...
by dominicbeesley
Sat Mar 03, 2018 11:38 am
Forum: hardware
Topic: A new monitor in NTSC land
Replies: 5
Views: 226

Re: A new monitor in NTSC land

That's a tiny version of the monitor I use. Excellent quality and useful to be able to display all the standards. It's good for game development too...the EHT is generated separate to the line frequency so our doesn't blow up if you feed it out of spec signals and will try and sync anything remotely...
by dominicbeesley
Thu Mar 01, 2018 2:21 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 9236

Re: 6809 experiments

I've had a look at the NitrOs9 version, which is still on SourceForge, it's on the round-tuits pile at the moment. What with porting the MOS, MMFS, USBFS, HostFS, BASIC to 6809 and then finishing off blitter/sound/dma for 6809 and 6502 and designing the new motherboard it is somewhere near the back ...
by dominicbeesley
Wed Feb 28, 2018 4:40 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 9236

Re: 6809 experiments

I've spent the last few evenings (into the early hours) making a start on porting the bare-bones of HostFS to the 6809, I've got it to the point where it boots, selects the FS (anything further tends to crash the machine). I then spent some time on making the NoICE mos rom work better when debugging...