Search found 537 matches

by dominicbeesley
Fri Apr 20, 2018 10:52 am
Forum: hardware
Topic: SWRAM protection at power down
Replies: 5
Views: 229

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: 5
Views: 229

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: 123

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: 57
Views: 3401

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: 421

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: 57
Views: 3401

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: 421

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: 57
Views: 3401

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: 421

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: 421

Re: Elk advice

Doh!
by dominicbeesley
Wed Apr 11, 2018 3:19 pm
Forum: hardware
Topic: Elk advice
Replies: 14
Views: 421

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: 57
Views: 3401

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: 421

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: 29
Views: 892

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: 2511

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: 558
Views: 41432

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: 292

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: 292

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: 558
Views: 41432

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: 844

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: 8870

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: 194

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: 8870

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: 8870

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...
by dominicbeesley
Sun Feb 25, 2018 1:23 pm
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 8870

Re: 6809 experiments

I've made some progress this past few weeks. 1) Sent off a board for fabrication This is a proof of concept testing board, it plugs into the Beeb's cpu socket and hosts a MachXO3 breakout board as a mezzanine. It also has 1MB SRAM, 512K ROM a battery backup function. This is all completely OTT but s...
by dominicbeesley
Fri Feb 16, 2018 3:26 pm
Forum: hardware
Topic: 65c02 VHDL/Verilog core
Replies: 2
Views: 224

Re: 65c02 VHDL/Verilog core

Thanks Dave, these both look the part! I'll have a play and report back if I ever get time to finish this board!

D
by dominicbeesley
Fri Feb 16, 2018 11:49 am
Forum: hardware
Topic: 65c02 VHDL/Verilog core
Replies: 2
Views: 224

65c02 VHDL/Verilog core

Hello, I'm about to send off my latest (blit/dma/cpu/sound) board for fabrication and was wondering how to test this in a master. In the beeb I've tended to first bring these up using a VHDL core (T65) which works well and I'm familiar with. However, I know that the T65 core is incomplete and doesn'...
by dominicbeesley
Tue Feb 13, 2018 12:56 am
Forum: hardware
Topic: bbc master RDY
Replies: 3
Views: 286

Re: bbc master RDY

Thanks for that Dave, as I suspected but good to get confirmation.

That pulseview display looks brilliant! I need to get that working here...is it a plugin you've made?

D
by dominicbeesley
Mon Feb 12, 2018 9:57 pm
Forum: hardware
Topic: bbc master RDY
Replies: 3
Views: 286

bbc master RDY

I notice that the Master uses the 65c12's RDY line, and is connected to the PBC(IC21) and the IOC(IC15). Not having access to my Master at the moment I can't have a poke to see what this is used for - is it to do the 1MHzE cycle stretching or is it something more fancy?

D
by dominicbeesley
Mon Feb 05, 2018 1:56 pm
Forum: hardware
Topic: R65C02 in a Beeb
Replies: 51
Views: 1564

Re: R65C02 in a Beeb

No but the cpu might be affected by trying to read data from RAM before it is ready!

D