Search found 274 matches

by Ramtop
Tue Sep 17, 2019 11:55 am
Forum: other vintage hardware, software and languages
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 54
Views: 6549

Re: The 8-Bit Guy's new 65816 based computer

Good point about licensing and compliance! If the final product is anything like the board shown in the video I have a feeling compliance issues may kill off any chance of it being sold as a fully assembled item in the EU. Stand-alone consumer devices can't be legally sold without the CE mark, and ...
by Ramtop
Mon Sep 16, 2019 10:09 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 58
Views: 8264

Re: Electron SD Interface & SW Ram Expansion

I'll do a UEF as well, yes. The WAV file is included simply because it plays back on pretty much anything.

The updater will be posted at the weekend, I'll include the recovery files as well if by that point I'm happy there are no major bugs in it.
by Ramtop
Mon Sep 16, 2019 1:22 pm
Forum: other vintage hardware, software and languages
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 54
Views: 6549

Re: The 8-Bit Guy's new 65816 based computer

His experiences with Planet X3 did seem to be a bit of a nightmare. I wouldn't have wanted to be under that kind of stress. The money required to put a large board full of through-hole parts into production is not trivial, though, so do I wonder where it'll come from if not Kickstarter. Even a small...
by Ramtop
Sun Sep 15, 2019 11:53 pm
Forum: other vintage hardware, software and languages
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 54
Views: 6549

Re: The 8-Bit Guy's new 65816 based computer

Presumably it'll show up on Kickstarter; David Murray raised over $100,000 for Planet X3, so he should easily be able to get enough to put the board into production. The source for the video FPGA is an important factor, though. If the developer goes off in a huff (as so often happens on these kind o...
by Ramtop
Sun Sep 15, 2019 9:00 pm
Forum: other vintage hardware, software and languages
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 54
Views: 6549

Re: The 8-Bit Guy's new 65816 based computer

I think the common factor for UK machines was the use of ULAs, and consequently the display logic had to be fairly simple. Whereas several of the US manufacturers had either their own ASIC production facilities or could afford to hire one. Commodore had access to their own chip fab, so they could ge...
by Ramtop
Sun Sep 15, 2019 8:44 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 58
Views: 8264

Re: Electron SD Interface & SW Ram Expansion

Thanks for the kind words, 0xC0DE :)

The updater is delayed until next week, life is kicking my backside in terms of free time at the moment.
by Ramtop
Mon Sep 09, 2019 1:04 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 58
Views: 8264

Re: Electron SD Interface & SW Ram Expansion

I'm currently finishing work on the updater that will flash the main copy of MMFS, hopefully it should be available some time this week. It works, but I want to test it to death because of the potential for bricking the card if it goes wrong. There should also be, fairly soon-ish, a recovery utility...
by Ramtop
Sat Aug 10, 2019 12:05 pm
Forum: wanted
Topic: Wanted: Electron Issue 6
Replies: 2
Views: 449

Re: Wanted: Electron Issue 6

Thanks, Dave.

Enojy your holiday, wet or dry :D
by Ramtop
Fri Aug 09, 2019 10:48 pm
Forum: wanted
Topic: Wanted: Electron Issue 6
Replies: 2
Views: 449

Wanted: Electron Issue 6

Hi all,

I'm in need of an issue 6 Elk. Has to be working, but otherwise condition doesn't really matter - even a bare motherboard would be fine.

Many thanks!
by Ramtop
Fri Aug 09, 2019 6:44 pm
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 391
Views: 63771

Re: Remarkable videos recently posted on Youtube

Very interesting. I'm amazed Chris has managed to keep going all these years, computer shops of any type are becoming a rare sight.
by Ramtop
Thu Aug 08, 2019 11:37 pm
Forum: 8-bit acorn hardware
Topic: Wiring question regarding Acorn Electron ROMs
Replies: 6
Views: 871

Re: Wiring question regarding Acorn Electron ROMs

Welcome Ray! Not so long ago I was doing the same thing you are. I won't claim to know the best approach, but this is the board I knocked up to do the job: https://stardot.org.uk/forums/viewtopic.php?f=3&t=12737&start=30#p220210 I used a small CPLD that watches for writes to the ROM selectio...
by Ramtop
Tue Aug 06, 2019 12:01 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 58
Views: 8264

Re: Electron SD Interface & SW Ram Expansion

That's good to hear. :)
by Ramtop
Tue Aug 06, 2019 11:59 am
Forum: 8-bit acorn hardware
Topic: MMFS Development and Support
Replies: 1007
Views: 108535

Re: MMFS Development and Support

I've seen some very subtle / specific bugs that were caused by violated these rules. It turns out you were spot on, Dave. I enabled writing to the FPGA's block RAM and sideways MMFS runs perfectly from there, so the villain of the piece is indeed my handling of the SRAM. p.s. I fully understand CMc...
by Ramtop
Mon Aug 05, 2019 9:58 pm
Forum: 8-bit acorn hardware
Topic: MMFS Development and Support
Replies: 1007
Views: 108535

Re: MMFS Development and Support

With SRAM, how are you generating the OE and WE signals? The SRAM setup is a bit complicated, it connects to the FPGA rather than the 6502 as it needs to be accessed by several different devices. The 6502 interface in the FPGA pulls data from different sources - SRAM, BRAM, UFM - as required. I'm t...
by Ramtop
Mon Aug 05, 2019 7:41 pm
Forum: 8-bit acorn hardware
Topic: MMFS Development and Support
Replies: 1007
Views: 108535

Re: MMFS Development and Support

I'm presently tearing my hair out with a seemingly insoluble problem. A bit of background; I've been working on a piece of hardware for the Electron, It does various things, but relevant bits are an Intel FPGA, some SRAM and an SD card slot configured using an emulated printer port. Some of the SRAM...
by Ramtop
Sun Aug 04, 2019 3:44 pm
Forum: miscellaneous new bbc and electron games
Topic: Electron AGD
Replies: 7
Views: 1837

Re: Electron AGD

Very nice!

SW Ram really doesn't get used enough on the Elk.
by Ramtop
Sat Aug 03, 2019 12:14 am
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 58
Views: 8264

Re: Electron SD Interface & SW Ram Expansion

Good to know. That didn't used to be the case. Some months ago I sent a PM to someone who didn't have access and they never received it.
by Ramtop
Fri Aug 02, 2019 9:37 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 58
Views: 8264

Re: Electron SD Interface & SW Ram Expansion

Replied via email - ebay is pretty nasty, they scan messages for contact details and may charge me a fee if they find any.
by Ramtop
Wed Jul 31, 2019 7:25 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 58
Views: 8264

Re: Electron SD Interface & SW Ram Expansion

There's plenty, I did a larger than usual batch this time. :)

When you get PM access just send me a message and I'll sort one out for you.
by Ramtop
Tue Jul 30, 2019 6:26 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 58
Views: 8264

Re: Electron SD Interface & SW Ram Expansion

A new batch is now available! :)

If you'd like one please PM me. (if you don't have PM access yet, click the 'contact us' button at the bottom of the page and ask the mods to give you access). I will start posting out orders on Thursday (1st).
by Ramtop
Thu Jul 11, 2019 3:22 pm
Forum: 8-bit acorn hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 565
Views: 65722

Re: Proposed: "The Ultimate Electron Upgrade"

That's very, very cool. :D

I wonder how much work is involved in patching the MOS and BASIC to work with mode 7, and how much it would take to implement an 80-column colour text mode?
by Ramtop
Tue Jul 09, 2019 6:23 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 58
Views: 8264

Re: Electron SD Interface & SW Ram Expansion

None available at the moment, I shipped off the last one today.

Should have another batch in about 3 weeks as I have to wait on the PCBs coming from China.
by Ramtop
Mon Jul 08, 2019 12:16 am
Forum: 8-bit acorn hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 565
Views: 65722

Re: Proposed: "The Ultimate Electron Upgrade"

I started using it about 4 days ago and have spent pretty much all of that time trying to figure out why the heck reads from even addresses worked fine, but reads from odd addresses returned the same data as the preceding even address. I didn't really consider a bug at first, naively thinking Intel ...
by Ramtop
Sun Jul 07, 2019 10:51 pm
Forum: 8-bit acorn hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 565
Views: 65722

Re: Proposed: "The Ultimate Electron Upgrade"

I2S implemented... turns out that's a lot easier than you might expect if you're just pushing 1-bit audio. Now we have sound :) Very nice. :D I don't know if you're planning on using the on-board user flash memory on the Max 10, but I've found out the hard way after days of bashing my head against ...
by Ramtop
Mon Jun 24, 2019 8:55 pm
Forum: general
Topic: The making of The Computer Programme (TV) — Beeb news from 1982
Replies: 2
Views: 843

Re: The making of The Computer Programme (TV) — Beeb news from 1982

Thanks for posting those! It's interesting to read a bit about the process and intentions behind the BBC's computer programmes.
by Ramtop
Thu Jun 20, 2019 8:52 pm
Forum: 8-bit acorn hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 565
Views: 65722

Re: Proposed: "The Ultimate Electron Upgrade"

We are eagerly waiting to see if the monster lives, Dr Frankenstein :D
by Ramtop
Wed Jun 19, 2019 9:01 pm
Forum: 8-bit acorn hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 565
Views: 65722

Re: Proposed: "The Ultimate Electron Upgrade"

All I can say is =D>
by Ramtop
Tue Jun 18, 2019 6:40 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 58
Views: 8264

Electron SD Interface & SW Ram Expansion

Hi all, The sun rises, the Earth spins, and Ramtop is back with another Electron SD card interface :D elksd64_ivory_1.jpg elksd64_ivory_2.jpg The ElkSD64 looks similar to my earlier Mk3 interface, but it is a complete redesign internally. It now comes with 32K of sideways RAM and uses the bootstrap ...
by Ramtop
Wed Jun 12, 2019 6:01 pm
Forum: 8-bit acorn hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 565
Views: 65722

Re: Proposed: "The Ultimate Electron Upgrade"

It's probably worth setting some expectations here on pricing. Myelin's ULA replacement board is not going to be cheap! Looking at it, I have to agree on that. It'll cost quite a bit to build. I'm presently working on an external Electron expansion that involves much of the same components, includi...
by Ramtop
Tue Jun 11, 2019 8:29 pm
Forum: 8-bit acorn hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 565
Views: 65722

Re: Proposed: "The Ultimate Electron Upgrade"

I agree with Dave's comments about board testing. This board has supposedly undergone electrical testing at JLC, but I'm not sure what that means. In my experience JLCPCB's testing consists of looking at the board for a few seconds, saying "yep, that looks fine to me" and shipping it out....

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