Search found 34 matches

by atcurtis
Mon Oct 02, 2017 4:41 am
Forum: upcoming and recent events & exhibitions
Topic: Proposal: San Francisco Bay Area user group
Replies: 5
Views: 684

Re: Proposal: San Francisco Bay Area user group

I think exhibiting Acorn computers would be a great idea since so few Americans even know of their existence.

Would be cool if someone had an early A310 machine to show off an example of 1987 technology. I tried to snag a A3000 from ebay but it moved out of my price range.
by atcurtis
Sat Sep 16, 2017 6:47 pm
Forum: for sale / freebies
Topic: VideoNuLA boards
Replies: 35
Views: 2604

Re: VideoNuLA boards

I'm definitely interested in a board for my BBC Master. It'll need intl shipping to the USA.
by atcurtis
Thu Sep 07, 2017 8:56 am
Forum: hardware
Topic: NuLA demos
Replies: 130
Views: 6396

Re: NuLA demos

What would be fun would be a combination of the NuLA + ARM Copro (Pi) with BasicV and extra stuff so that one can use simple programming in Basic and the graphics output drive the NuLA to get the rich colour mode.
by atcurtis
Mon Jul 17, 2017 10:15 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2486
Views: 180524

Re: Worth Taking a Look At

vanpeebles wrote:I bet there is an old cupboard in a college or school somewhere full of those old servers.

Probably sealed behind drywall and everyone had forgotten that there was ever a cupboard there.
by atcurtis
Fri Jul 07, 2017 8:27 am
Forum: software: other
Topic: Anyone got Communicator system software? (Basic has 65816 assembler)
Replies: 70
Views: 4226

Re: Anyone got Communicator system software? (Basic has 65816 assembler)

I think it would be cool to clone since it's kinda a stepping stone between the classic Beeb and the Archimedes.

I wish I had the time ... but I'm just toying around with the idea to couple a 65816 + a few cplds + dram etc and put it in a BBC Master or Compact case...
by atcurtis
Sun Jul 02, 2017 11:16 pm
Forum: hardware
Topic: Vectorlight's A3010 IDE mod : step by step guide
Replies: 60
Views: 3310

Re: Vectorlight's A3010 IDE mod : step by step guide

I'd like to order a board if possible... I live in the USA.
by atcurtis
Mon Jun 26, 2017 1:16 am
Forum: software: other
Topic: Anyone got Communicator system software? (Basic has 65816 assembler)
Replies: 70
Views: 4226

Re: Anyone got Communicator system software? (Basic has 65816 assembler)

Here's my original 5184x3456 camera image of the "Communicator15" picture in case there's any more useful detail before it was cropped, resized and compressed: IMG_1516.JPG The era when BT approved devices used huge inductors to hold the telephone line off-hook instead of gyrator circuits...
by atcurtis
Sat Jun 03, 2017 10:38 am
Forum: hardware
Topic: Today I overclocked my A3010
Replies: 223
Views: 11987

Re: Today I overclocked my A3010

AndyMc1280 wrote:Ooo very nice :D :D

What speed does that work at ? :wink:


Those parts are 50 ns so... 20MHz?
by atcurtis
Wed May 17, 2017 11:14 am
Forum: software: other
Topic: Anyone got Communicator system software? (Basic has 65816 assembler)
Replies: 70
Views: 4226

Re: Anyone got Communicator system software? (Basic has 65816 assembler)

Hmm... The fun thing will be how to work out the memory map since the whole of the first ROM can't be the whole of the first 64K because the stack has to live somewhere there. It looks like it uses the lots-of-modules approach like RiscOS and the COP entry looks like the inspiration for ARM's SWIs s...
by atcurtis
Tue May 16, 2017 6:37 am
Forum: software: other
Topic: Anyone got Communicator system software? (Basic has 65816 assembler)
Replies: 70
Views: 4226

Re: Anyone got Communicator system software? (Basic has 65816 assembler)

Were the ROMs ever dumped? I'm curious if BASIC on it supported the paging/large memory space or was it just running in 6502 mode.
by atcurtis
Fri May 05, 2017 2:49 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2486
Views: 180524

Re: Worth Taking a Look At

At today's crazy prices I think that's quite a good deal! Yes ! I rushed buying it NOW ... if it could be one with an Adelaide board, it would make my day / week / month :wink: For sure these days battery leak is a common 'gift' with these machines ... and it's even more atrocious when it's a mezza...
by atcurtis
Wed May 03, 2017 7:43 am
Forum: hardware
Topic: USB Electron Cartridge Interface
Replies: 27
Views: 2094

Re: USB Electron Cartridge Interface

Interesting... Although I have a BBC Master. btw, is there an Acorn fan/user group in the San Francisco bay area? I'm in the south bay area. Oh good, someone else in this part of the world! I grew up in New Zealand, where Acorn machines were pretty dominant for a while, and wasn't sure if anyone el...
by atcurtis
Wed May 03, 2017 7:41 am
Forum: hardware
Topic: USB Electron Cartridge Interface
Replies: 27
Views: 2094

Re: USB Electron Cartridge Interface

sydney wrote:myelin, atcurtis - you guys have seen the google maps thread, haven't you?

http://www.stardot.org.uk/forums/viewto ... =41&t=8933


Now I have.
by atcurtis
Tue May 02, 2017 8:31 am
Forum: hardware
Topic: USB Electron Cartridge Interface
Replies: 27
Views: 2094

Re: USB Electron Cartridge Interface

Interesting... Although I have a BBC Master.

btw, is there an Acorn fan/user group in the San Francisco bay area? I'm in the south bay area.
by atcurtis
Tue May 02, 2017 8:17 am
Forum: hardware
Topic: My new project (don't tell Arcardian)
Replies: 35
Views: 1515

Re: My new project (don't tell Arcardian)

Zarchos wrote:https://www.dream.fr/pdf/Serie2000/SAM_Datasheets/SAM2695.pdf

Looking at the datasheet... it may be possible to make it a board which replaces the ADC... with seperate audio output, of course.
by atcurtis
Mon Jan 30, 2017 2:02 am
Forum: hardware
Topic: A3010 hard disc interface
Replies: 142
Views: 15126

Re: A3010 hard disc interface

I don't have any other acorn machines, so it's impossible for me to know if any of my cards will work or not in advance of trying them. Have you tried formatting/partitioning on the machine directly with hform (which is where I get stuck)? I've thought for a while I should probably invert the signa...
by atcurtis
Mon Jan 30, 2017 1:58 am
Forum: hardware
Topic: A3010 hard disc interface
Replies: 142
Views: 15126

Re: A3010 hard disc interface

vectorlight wrote:
atcurtis wrote:Cool! Any spare bare PCBs for sale?


If you cover the postage you can have one for free. Just the bare PCB, no components. I'll make a list of all the components soon. :D


Sure... Tell me how much to pay via paypal to post it to the USA (where I live these days).
by atcurtis
Sun Jan 29, 2017 1:17 am
Forum: hardware
Topic: A3010 hard disc interface
Replies: 142
Views: 15126

Re: A3010 hard disc interface

I've built a version of this myself and have had some success with it. I've used a slightly different approach to munchausen and have built a board that plugs into the ROM sockets which saves soldering a about 19 connections :D Have booted it up today with a pair of known working CF cards and hey p...
by atcurtis
Tue Jan 10, 2017 9:25 am
Forum: hardware
Topic: Star LC-10 dot matrix printer
Replies: 15
Views: 1395

Re: Star LC-10 dot matrix printer

Actually most dot-matrix printers use/used the ribbon to lubricate the print head needles - at least with the genuine ribbons where the head lubricant is part of the ink formulation. Of course on a printer which has been dormant for a considerable period of time a little WD40 will help. Once given ...
by atcurtis
Sun Jan 08, 2017 9:43 am
Forum: hardware
Topic: Star LC-10 dot matrix printer
Replies: 15
Views: 1395

Re: Star LC-10 dot matrix printer

Star Micronics dot matrix printers are great work horses. When consumer printers all went too cheap, they stuck to what they knew and continued to make great dot matrix printers which are still working in industry today... Except at a premium price because people still needed carbon copies. Just be...
by atcurtis
Fri Jan 06, 2017 4:23 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2486
Views: 180524

Re: Worth Taking a Look At

These look like fascinating beasts... http://r.ebay.com/WVIZFj
Looks like someone took an ordinary A7000 motherboard and designed a custom backplane to turn it into a 1U rackmounted server.
by atcurtis
Tue Jan 03, 2017 12:24 am
Forum: hardware
Topic: Star LC-10 dot matrix printer
Replies: 15
Views: 1395

Re: Star LC-10 dot matrix printer

Star Micronics dot matrix printers are great work horses. When consumer printers all went too cheap, they stuck to what they knew and continued to make great dot matrix printers which are still working in industry today... Except at a premium price because people still needed carbon copies. Just be ...
by atcurtis
Sun Nov 27, 2016 3:13 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2486
Views: 180524

Re: Worth Taking a Look At

jonb wrote:


Hmm, I saw that and thought "What a piece of junk.."


I thought the same.
by atcurtis
Sun Nov 27, 2016 3:07 am
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 506
Views: 27390

Re: Palettemate / enhanced video ULA with 4096 colours

jgharston wrote:I always struggled with PCB drafting software, which is why I ended up using PaintShopPro. ;)


I've found that https://easyeda.com/ works quite well. The autorouting isn't very smart, though but it's at the right price: Free.
by atcurtis
Thu Nov 24, 2016 7:18 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 506
Views: 27390

Re: Palettemate / enhanced video ULA with 4096 colours

As for sprites, I'd be tempted to say they belong in a re-implemented 6845! You'd almost end up implementing the HD63484 ACRTC from the Prisma. :) Looked at the datasheet for the ACRTC for the first time and wow, it's a pretty sophisticated beastie. It would almost be tempting to reimplement the CR...
by atcurtis
Fri Nov 18, 2016 5:08 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 506
Views: 27390

Re: Palettemate / enhanced video ULA with 4096 colours

Unfortunately, I can't remember how many LEs the original ULA used but I have a feeling it was around 170/180. I can recompile the old code to find out if you want. My intention was always to recreate the capabilities of the Palettemate so I haven't given much thought to more functionality. Also, t...
by atcurtis
Fri Nov 18, 2016 4:47 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 506
Views: 27390

Re: Palettemate / enhanced video ULA with 4096 colours

What CPLD are you using and will the code be uploaded to github? Sounds like it'd be fun to play ... I have a spare XC9572 which should be 5V compatible or a few XC9536XL if it could squeeze into that. Unfortunately, I don't have anything in between that and a Spartan6. It's an Altera Max II EPM570...
by atcurtis
Fri Nov 18, 2016 12:07 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 506
Views: 27390

Re: Palettemate / enhanced video ULA with 4096 colours

Unfortunately, scan line doubling is beyond the CPLD I'm using as it simply doesn't have enough space :( What CPLD are you using and will the code be uploaded to github? Sounds like it'd be fun to play ... I have a spare XC9572 which should be 5V compatible or a few XC9536XL if it could squeeze int...
by atcurtis
Fri Nov 18, 2016 11:41 am
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1003
Views: 75051

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10?

Received the pcb kit (thanks Kjell) and quickly soldered on the components...
It worked first time. :D

I must say, though.... It is a very tight fit under a BBC Master... No matter, it still works.
by atcurtis
Fri Nov 18, 2016 9:38 am
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1003
Views: 75051

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10?

There's no processor emulation layer; the Tube Client is written from scratch in C, and runs natively on the Pi. Rather like Sprow's ARM7DTMI Co Pro, you end up having to implement quite a large set of SWI calls: https://github.com/hoglet67/PiTubeClient/blob/master/bare-metal/tube-swi.c just to be ...

Go to advanced search