Search found 104 matches

by Ramtop
Thu Jul 11, 2019 2:22 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 438
Views: 27820

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 5:23 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 4
Views: 449

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
Sun Jul 07, 2019 11:16 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 438
Views: 27820

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 9:51 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 438
Views: 27820

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 7:55 pm
Forum: general
Topic: The making of The Computer Programme (TV) — Beeb news from 1982
Replies: 2
Views: 305

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 7:52 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 438
Views: 27820

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 8:01 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 438
Views: 27820

Re: Proposed: "The Ultimate Electron Upgrade"

All I can say is =D>
by Ramtop
Tue Jun 18, 2019 5:40 pm
Forum: for sale / freebies
Topic: Electron SD Interface & SW Ram Expansion
Replies: 4
Views: 449

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 5:01 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 438
Views: 27820

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 7:29 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 438
Views: 27820

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. Since swi...
by Ramtop
Sun May 19, 2019 12:34 am
Forum: other vintage computer hardware, software and games
Topic: 50 years of AMD
Replies: 11
Views: 460

Re: 50 years of AMD

Coeus wrote:
Sat May 18, 2019 6:22 pm
Back from where? And didn't AMD do some useful stuff before the processor war with Intel?
AMD had a quite diverse range of products before getting into x86 competition with Intel. They had their own line of RISC processors, Ethernet controllers, flash ram, SRAM, and a bunch of other things.
by Ramtop
Wed May 08, 2019 6:45 pm
Forum: hardware
Topic: Useful Electron ROMs?
Replies: 6
Views: 352

Re: Useful Electron ROMs?

You could use JGH's relocatable modules system to create a ROM bank that's effectively got multiple ROMs in it: That's a darn good idea actually, as my ideal ROM needs to have a pile of only vaguely related stuff in it. Why not just load the MMB file with all the Electron ROMs you can find and go w...
by Ramtop
Tue May 07, 2019 10:00 pm
Forum: hardware
Topic: Useful Electron ROMs?
Replies: 6
Views: 352

Useful Electron ROMs?

Hi All, I'm just finishing work on Yet Another Electron SD Card Interface (YAESDCI - I should trademark that :D ) and am looking inspiration on what to load into a spare SWROM slot. The card has 2x16K sideways pages of flash and 2x16K of SWRAM. ZEMMFS uses up one of the flash pages, so one is free. ...
by Ramtop
Wed May 01, 2019 10:34 am
Forum: general
Topic: DRAGON USER gripes about the Computer Literacy Programme.....
Replies: 52
Views: 1545

Re: DRAGON USER gripes about the Computer Literacy Programme.....

The Dragon as the Atom uses the 6847 which can do : 32x16 text (uppercase only). A bunch of semi-graphic modes up to 64x192 in 8 colours (this is a consiquence of the Dragon & CoCo using the SAM). 128x192 in 4 coulours (2 sets) 256x192 in mono (2 sets) So on both couts by some metrics the 6847 coul...
by Ramtop
Tue Apr 30, 2019 6:20 pm
Forum: general
Topic: DRAGON USER gripes about the Computer Literacy Programme.....
Replies: 52
Views: 1545

Re: DRAGON USER gripes about the Computer Literacy Programme.....

They're basically a coco - the display is awful (al-la-atom), but the guts aren't too shabby with a 6809? It's quite a poor computer overall, with the exception of the CPU. The graphics are particularly bad, 192x160 in four garish colours doesn't really stand up well to a VIC-20 never mind the Spec...
by Ramtop
Tue Apr 30, 2019 1:38 pm
Forum: general
Topic: DRAGON USER gripes about the Computer Literacy Programme.....
Replies: 52
Views: 1545

Re: DRAGON USER gripes about the Computer Literacy Programme.....

Oh, come on. When I worked in a computer shop in the '80s we couldn't give the Dragons away, they were that bad. I recall they were quite successful for a short time after launch, mostly because Sinclair was having production issues and Spectrums were in short supply. I've no doubt Dragon probably ...
by Ramtop
Fri Apr 26, 2019 1:53 pm
Forum: off-topic
Topic: Other RC2014 owners
Replies: 19
Views: 1201

Re: Other RC2014 owners

That was quite interesting. Very good to see someone so young getting stuck in with a soldering iron, and doing a commendable job of it.
by Ramtop
Tue Apr 16, 2019 1:57 pm
Forum: hardware
Topic: The sound of BBC graphics!
Replies: 12
Views: 626

Re: The sound of BBC graphics!

As I recall the problem was restricted to revision 1A A1200s only. Commodore fitted the wrong resistors on the audio output, which caused massive clipping of the sound - one of my A1200s is an original 1A (which I bought back in late 1992) which has the issue. It also has the audio capacitors fitted...
by Ramtop
Tue Apr 16, 2019 11:39 am
Forum: hardware
Topic: The sound of BBC graphics!
Replies: 12
Views: 626

Re: The sound of BBC graphics!

Apparently the CPC464 made different noises depending on how busy the CPU was. I remember that. BITD a mate had a 464 and after the tape drive shut off it was common the hear 'wheee-wheee-wheee' noise through the speaker as the game drew the title screen. Back in those days manufacturers didn't car...
by Ramtop
Sun Apr 14, 2019 8:14 pm
Forum: for sale / freebies
Topic: Electron MicroSD Card Interfaces (SOLD OUT)
Replies: 105
Views: 4631

Re: Electron MicroSD Card Interfaces (SOLD OUT)

Hah, I literally did this about 30 minutes ago and posted in the MMFS thread before checking here. :D I wasn't sure this would work as it's not built by default. But it seems to function just fine on my dev board. Any potential issues I'm missing? (deleted the post in MMFS thread to save confusion)
by Ramtop
Sun Apr 14, 2019 11:08 am
Forum: for sale / freebies
Topic: Electron MicroSD Card Interfaces (SOLD OUT)
Replies: 105
Views: 4631

Re: Electron MicroSD Card Interfaces (SOLD OUT)

You might need to let go of MMFS and the printer port emulation and try something new. Not much chance of that, to be honest. The motivation behind my designs is to provide a cheap, basic way of using memory cards with the Elk. The EPP version of MMFs makes that feasible, I don't know of any other ...
by Ramtop
Sat Apr 13, 2019 9:55 pm
Forum: for sale / freebies
Topic: Electron MicroSD Card Interfaces (SOLD OUT)
Replies: 105
Views: 4631

Re: Electron MicroSD Card Interfaces (SOLD OUT)

The CPLD is 100% full with the current code, 36 out of 36 macrocells used. Besides, it only provides dumb I/O lines to the SD card. Management of the card is done completely by MMFS, and my 6502 skills are not really good enough right now for me to want to monkey about with that. Hoglet is way bette...
by Ramtop
Thu Apr 11, 2019 9:19 am
Forum: hardware
Topic: Electron edge connectors
Replies: 3
Views: 294

Re: Electron edge connectors

The connector I use in my boards is this one: https://www.digikey.co.uk/product-detail/en/te-connectivity-amp-connectors/5530843-5/A31718-ND/770544 I use it because it is cheap and readily available, big factors when you're building dozens of boards. It's designed for through-hole use, so if your bo...
by Ramtop
Tue Apr 09, 2019 9:26 pm
Forum: hardware
Topic: Save my Elk...
Replies: 25
Views: 924

Re: Save my Elk...

No transitions on the RW line and a steady 2MHz clock suggests the CPU isn't getting as far as actually writing to RAM. Try probing the SYNC pin. If there are no transitions there I'd lean strongly in favour of the 6502 being borked. Even if the ROM and ULA are dead, provided the CPU is getting a cl...
by Ramtop
Sun Apr 07, 2019 5:12 pm
Forum: for sale / freebies
Topic: Electron SD Card Interfaces (SOLD OUT)
Replies: 14
Views: 729

Re: Electron SD Card Interfaces

Drop me a PM. Because you have less than 25 posts you'll need to use the 'contact us' button at the bottom of the page to ask the moderators to enable PMs on your account. I wish I had a spare Electron board to sell you! I have a grand total one of working Elk, which is the one use to test the SD bo...
by Ramtop
Sat Apr 06, 2019 9:54 pm
Forum: for sale / freebies
Topic: Electron MicroSD Card Interfaces (SOLD OUT)
Replies: 105
Views: 4631

Re: Electron MicroSD Card Interfaces (SOLD OUT)

There is one here : viewtopic.php?f=3&t=12794#p165811

Bear in mind that some games in that package won't work because of memory issues, but anything marked as requiring PAGE set to &1900 or &1D00 should be fine.
by Ramtop
Fri Apr 05, 2019 11:21 pm
Forum: for sale / freebies
Topic: Electron SD Card Interfaces (SOLD OUT)
Replies: 14
Views: 729

Re: Electron SD Card Interfaces

That's a very interesting colour. I may try some once they have stock.
by Ramtop
Thu Apr 04, 2019 8:53 pm
Forum: for sale / freebies
Topic: Electron SD Card Interfaces (SOLD OUT)
Replies: 14
Views: 729

Re: Electron SD Card Interfaces

Send me a PM, Andy, and I'll sort one out for you.
by Ramtop
Tue Apr 02, 2019 9:34 pm
Forum: hardware
Topic: Elektuur turbo board for the Electron
Replies: 15
Views: 611

Re: Elektuur turbo board for the Electron

Hmm, that's very interesting. A while back I sketched out a Electron turbo board using modern parts - a CPLD, some SRAM and a bus transceiver - that would sit under the 6502 and turbo by playing tricks with A15 and R/W, but didn't really know if the theory was sound. Google's translation is a bit ha...
by Ramtop
Tue Apr 02, 2019 2:02 pm
Forum: for sale / freebies
Topic: Electron SD Card Interfaces (SOLD OUT)
Replies: 14
Views: 729

Re: Electron SD Card Interfaces

I'm sure a special grey one can be arranged :D