Search found 7813 matches

by hoglet
Wed Feb 20, 2019 9:58 am
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 205
Views: 16866

Re: Proposed: "The Ultimate Electron Upgrade"

Sorry I've been a bit quiet on this thread recently. I haven't had much time since Christmas for this, or indeed any other retro computing projects. Here's a few thoughts... First, all the work I've done so far is on github, so anyone else is free to take this forward. The top level design for the P...
by hoglet
Tue Feb 19, 2019 10:42 pm
Forum: emulators
Topic: B-em on OSX with M5000 support
Replies: 9
Views: 255

Re: B-em on OSX with M5000 support

I honestly can't hear the difference when changing this value. I've been playing a selection of ample tracks all evening and playing with the mixer with different voices but there's no discernible difference. If I am understanding things correctly, the frequency error will be quite small. For examp...
by hoglet
Tue Feb 19, 2019 4:57 pm
Forum: software: other
Topic: Fixed: Enhanced Exile + TurboMMC compatibility? (patched Exile)
Replies: 48
Views: 3086

Re: Fixed: Enhanced Exile + TurboMMC compatibility? (patched Exile)

Exile is on disk 218, but so are a few other games.

So it may not be as easy as just overwriting the whole disk.
by hoglet
Mon Feb 18, 2019 12:25 pm
Forum: acorn atom and system
Topic: A Website dedicated to the Acorn System Computers
Replies: 18
Views: 415

Re: A Website dedicated to the Acorn System Computers

bprosman wrote:
Mon Feb 18, 2019 12:18 pm
The site gone or down ?

Code: Select all

This site has been removed because it has exceeded its bandwidth allowance.
by hoglet
Sun Feb 17, 2019 7:35 am
Forum: acorn atom and system
Topic: Look what I found.
Replies: 10
Views: 410

Re: Look what I found.

Hi David, I don't have a tape player at the moment, but I plan to buy one at some point fairly soon and will record it. Didn't realise I had something uncommon. Just wondering if you any closer to getting a tape player? We really would like to add this title to the Atom Software Archive. :D Dave
by hoglet
Sat Feb 16, 2019 8:02 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 621
Views: 25305

Re: RGB to HDMI using a Pi Zero and a small CPLD

If nothing has changed with the design (not kept up with thread!) I have some pcbs that I can farm out for a couple of quid including postage. No changes to the core design, so the PCBs should be fine. Note, connecting a ZX81 does require some external circuitry: https://stardot.org.uk/forums/viewt...
by hoglet
Fri Feb 15, 2019 9:28 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2728
Views: 239693

Re: Worth Taking a Look At

An enterprising individual has manufactured some replica System 1 PCBs: I've been look at these all week, thinking I really want to buy a set. They are made by trev-ham, who is a member here: https://stardot.org.uk/forums/search.php?author_id=10986&sr=posts He seems to have done a really nice job i...
by hoglet
Wed Feb 13, 2019 9:28 pm
Forum: acorn atom and system
Topic: AtomColour sync problems, tearing my hair out with this :(
Replies: 23
Views: 466

Re: AtomColour sync problems, tearing my hair out with this :(

Last time I had a .jed file which I programmed into the board using Impact. This time, there isn't a .jed file in the latest archive, but even if there was, Impact seems only able to load .cpf or .ipf files anyway. And there aren't any of those. There is a file Main.jed in Phill's zip. Impact can w...
by hoglet
Mon Feb 11, 2019 7:56 pm
Forum: software & utilities for the pc, mac or unix
Topic: Wires? Pah.....
Replies: 882
Views: 117345

Re: Wires? Pah.....

That looks perfect Dave - I see the base address is as per Simon's implementation but with Steve's device not being based on a genuine 6522, I presume it will behave the same on the outside-facing interface down to a microsecond level...? :-k I only ask because as you know, my bit-banged RS232 is a...
by hoglet
Mon Feb 11, 2019 7:11 pm
Forum: acorn atom and system
Topic: AtomColour sync problems, tearing my hair out with this :(
Replies: 23
Views: 466

Re: AtomColour sync problems, tearing my hair out with this :(

If the problem really is noise, what could the mechanism be for generating more noise when running specific games I wonder? I think Phill has just proved that it is noise on the frame sync signal that is responsible. There are likely two factors at play here: the timing of the noise and it's magnit...
by hoglet
Mon Feb 11, 2019 6:05 pm
Forum: software & utilities for the pc, mac or unix
Topic: Wires? Pah.....
Replies: 882
Views: 117345

Re: Wires? Pah.....

Regarding User Port conflicts on the Master, Simon ( sydney ) confronted this problem by adding a second User Port via the Master's internal Econet connector - have a read of the thread here . I produced a special version of UPURS to be compatible with this new second port so in his case, he can us...
by hoglet
Mon Feb 11, 2019 4:14 pm
Forum: acorn atom and system
Topic: AtomColour sync problems, tearing my hair out with this :(
Replies: 23
Views: 466

Re: AtomColour sync problems, tearing my hair out with this :(

Phill, I've been thinking about this a bit more. GIven the generated sync pulse moves to the right, that would suggest the counter is being un-intentionally reset, This is your Verilog for FSCCount: always @(posedge VCLKOUT or posedge FS) begin if (FS) FSCCount <= 14'b0; else FSCCount <= FSCCount +1...
by hoglet
Mon Feb 11, 2019 12:50 pm
Forum: acorn atom and system
Topic: AtomColour sync problems, tearing my hair out with this :(
Replies: 23
Views: 466

Re: AtomColour sync problems, tearing my hair out with this :(

Hi Phill, So far I've been unable to reproduce this on the board I build up (which is a 5.10 I think). But it may just be that my LG TV is very tolerant of malformed sync pulses. What's the actual effect on the sync pulse if you put a scope on it? i.e. is it shorter or longer than normal, does its p...
by hoglet
Mon Feb 11, 2019 11:40 am
Forum: hardware
Topic: Music 5000 FPGA
Replies: 63
Views: 11217

Re: Music 5000 FPGA

I am very interested in Music 5000 as a stand-alone instrument/complex oscillator primarily to satisfy my endless quest in search of interesting/quirky/characterful vintage sound sources for my sound design. With this in light, although AMPLE is of interest to me (and especially if some kind soul c...
by hoglet
Mon Feb 11, 2019 9:50 am
Forum: hardware
Topic: Music 5000 FPGA
Replies: 63
Views: 11217

Re: Music 5000 FPGA

Not putting your design down at all, I like it, but part of me is actually starting to wonder that in my case it might actually be easier/similar in BOM cost simply to take the belt and braces approach and lay a new pcb out with the original discrete logic as most of them are very inexpensive and a...
by hoglet
Mon Feb 11, 2019 8:55 am
Forum: hardware
Topic: Music 5000 FPGA
Replies: 63
Views: 11217

Re: Music 5000 FPGA

Is your FPGA implementation currently not self-configuring from NVRAM? Is it currently reliant on a host connection over FT232 or have you bolted on some serial flash? The module I currently use is a GOP XC3S200. There are some photos in the manual here: http://www.oho-elektronik.de/pics/UM_XC3S200...
by hoglet
Mon Feb 11, 2019 7:32 am
Forum: hardware
Topic: Music 5000 FPGA
Replies: 63
Views: 11217

Re: Music 5000 FPGA

I am considering designing a new pcb with the FPGA, regulators, the AM6070 (or equivalent) and output circuitry on it initially for myself but would be happy to share the design in due course. The choice of FPGA would be entirely up to you. Take a look at this Xilinx Spartan XC6SLX9 board: https://...
by hoglet
Sun Feb 10, 2019 4:13 pm
Forum: hardware
Topic: Music 5000 FPGA
Replies: 63
Views: 11217

Re: Music 5000 FPGA

My question to you is would you be able to provide a special version of your FPGA code with a breakout to drive a real AM6070? This should be possible. I would need to add a bit of extra logic in to re-implement IC19 & IC20, and then just expose ~9 extra signals. The biggest barrier is going to be ...
by hoglet
Sun Feb 10, 2019 2:42 pm
Forum: hardware
Topic: Retro Hardware in FPGA's
Replies: 13
Views: 695

Re: Retro Hardware in FPGA's

Also... I'd dearly like to talk to Dave regarding his FPGA based Music 5000 clone but frustratingly I'm not up to 25 postings yet to permit a PM! Unless it's something that really needs to be kept private, I prefer to keep technical discussions in open forum threads. (Not least because I will be ab...
by hoglet
Sat Feb 09, 2019 6:49 pm
Forum: for sale / freebies
Topic: Electron MicroSD Card Interfaces
Replies: 39
Views: 839

Re: Electron MicroSD Card Interfaces

Nice!

What type of hardware interface does the CPLD implement?

(i.e. which build of MMFS do you need to use?)

Dave
by hoglet
Tue Feb 05, 2019 10:22 pm
Forum: software: other
Topic: BBC *Status Command (and odd characters)
Replies: 24
Views: 472

Re: BBC *Status Command (and odd characters)

The report giving (c) 1986 is also interesting. Indeed. What is Basic 6? There is a list of all known Basic version on Jonathan's site: http://beebwiki.mdfs.net/BASIC_Versions This is possibly: BASIC 40, 1986 Supplied in the Master Compact in the MOS 5.00 system ROM. A bit weird it being in a Model...
by hoglet
Tue Feb 05, 2019 8:56 pm
Forum: software: games - high scores
Topic: Quest to become ELITE!
Replies: 74
Views: 5527

Re: Quest to become ELITE!

Nice video!

That took some killing.
by hoglet
Tue Feb 05, 2019 7:47 am
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 227
Views: 31516

Re: Atom Colour Board Thread

With a CY62256 55ns 32K RAM on there I get the problem of the sync jumping about. With a 6264 made by RCA, I think it was harvested off a Slogger Turbo board....thanks Arcadian :) It's absolutely rock solid stable, I'm not sure why. I wonder if you are getting brief periods of bus conflict between ...
by hoglet
Mon Feb 04, 2019 10:16 pm
Forum: projects
Topic: BeebLink
Replies: 27
Views: 1243

Re: BeebLink

I'm now using a Pro Micro board with my Beeb, rather than a Minimus, so if there are any issues with it, I'll probably find them, and hopefully fix them. I've just bought a Pro Micro from eBay, which should be here by the weekend. I see you have documented the connections: https://github.com/tom-se...
by hoglet
Mon Feb 04, 2019 10:10 pm
Forum: acorn atom and system
Topic: Look what I found.
Replies: 10
Views: 410

Re: Look what I found.

Just spotted this thread.

It's been over a year since the last MIA Commercial Atom title was found, which was Aardvark Galaxians.

So this would be a very welcome addition to the Atom Software Archive.

Dave
by hoglet
Mon Feb 04, 2019 7:08 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 621
Views: 25305

Re: RGB to HDMI using a Pi Zero and a small CPLD

That very interesting, and the results look excellent. Nice work Ian!

Dave
by hoglet
Sun Feb 03, 2019 8:02 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 621
Views: 25305

Re: RGB to HDMI using a Pi Zero and a small CPLD

That's very nice Ian.

Does the Y output just drive all three of the RGB inputs then?

Do you have any plans to make a PCB for this (or to re-spin the RGBtoHDMI board with this instead of the 74LS08)?

Dave
by hoglet
Sat Feb 02, 2019 5:10 pm
Forum: projects
Topic: BeebLink
Replies: 27
Views: 1243

Re: BeebLink

tom_seddon wrote:
Sat Feb 02, 2019 3:30 pm
If you try it with a non-Minimus board yourself then I'd love to hear how you get on!
I have a Teensy 3.5 which is ARM based.

Do you think it's worth having a go with that?

(I really have no idea how AVR specific BeebLink and it's dependencies are)

Dave
by hoglet
Sat Feb 02, 2019 9:43 am
Forum: projects
Topic: BeebLink
Replies: 27
Views: 1243

Re: BeebLink

The board I've been using is the Minimus AVR 32K (ATmega32U2), and if you've got one of those in +5V mode, and some bits of jumper wire, you should be good to go with one of the GitHub releases. (It uses the LUFA library, so with a bit more DIY, it could be straightforward getting it to work with o...
by hoglet
Sat Feb 02, 2019 9:34 am
Forum: hardware
Topic: Connecting the Retro-Printer to the BBC
Replies: 13
Views: 420

Re: Connecting the Retro-Printer to the BBC

Thanks for the pointers everyone - for some reason, his BBC needs him to do a *FX5,2 command on startup (to select output to parallel port) According to the manual, that is supposed to be the default - so not sure why it isn't on his BBC! According to The Advanced User Guide Page 121 *FX 5,2 should...