Search found 2592 matches

by BigEd
Mon Sep 16, 2019 2:15 pm
Forum: other vintage computer hardware, software and games
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 54
Views: 2532

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

It's a fundamental thing, that the ridiculously low cost of electronics today is all down to scale. If you take away the scale - which almost all retro projects do - you're left with a very different price structure. Even 1000 units is not a volume production run, to the factories which make stuff i...
by BigEd
Mon Sep 16, 2019 2:00 pm
Forum: other vintage computer hardware, software and games
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 54
Views: 2532

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

oops - crossed in post One nice thing about through-hole is that you can sell as a kit. So no assembly costs. But there will be support costs, and returns, from people who really don't know what they are doing. At the other end, once you're all surface mount - which Dave Murray seems to suggest as a...
by BigEd
Mon Sep 16, 2019 11:24 am
Forum: general
Topic: Awesome collection of 70's & 80's tech docs and data sheets
Replies: 21
Views: 449

Re: Awesome collection of 70's & 80's tech docs and data sheets

Serendipity! Who would have expected 100's of articles from the BBC's Engineering Department?
https://archive.org/details/bbc-monographs-80/page/n5
by BigEd
Sun Sep 15, 2019 5:30 pm
Forum: hardware
Topic: CRTC timing with 2MHz clock
Replies: 14
Views: 298

Re: CRTC timing with 2MHz clock

In the case of a '2MHzE even' clock shape, it does look like there's a falling edge on 1MHzE a full cycle before time Q, and yes, I would expect the 6502 and glue logic to have done all the necessary things by this time. (I say that without having studied the schematic.)
by BigEd
Sun Sep 15, 2019 11:08 am
Forum: other vintage computer hardware, software and games
Topic: BCS ITNow ZX81 Issue
Replies: 3
Views: 155

Re: BCS ITNow ZX81 Issue

And again from the BCS website, here's one for beeb-spotting: And a slightly older one for Commodore fans:
by BigEd
Sun Sep 15, 2019 11:04 am
Forum: other vintage computer hardware, software and games
Topic: BCS ITNow ZX81 Issue
Replies: 3
Views: 155

Re: BCS ITNow ZX81 Issue

Hope some of the content is online. Here's something related from the BCS website:
by BigEd
Sun Sep 15, 2019 9:29 am
Forum: other vintage computer hardware, software and games
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 54
Views: 2532

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

Well indeed, requirements is quite a strong word! And desiderata is a bit obscure... "some initial thoughts" might be what was needed, but that's three words.
by BigEd
Sun Sep 15, 2019 9:03 am
Forum: off-topic
Topic: Project 'less clutter' phase 1
Replies: 5
Views: 174

Re: Project 'less clutter' phase 1

A big slot for all the cables underneath is a very nice idea!
by BigEd
Sun Sep 15, 2019 8:58 am
Forum: other vintage computer hardware, software and games
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 54
Views: 2532

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

Not having seen any of the facebook discussion, this update did look to me like an update! Some ideas had been had, and explored, and then there was a simplification. It's now looking like a 6502 project with a 16 bit address space and a relatively clean memory map, with heaps of banking. There's no...
by BigEd
Sat Sep 14, 2019 12:10 pm
Forum: off-topic
Topic: Experiences with 4G broadband
Replies: 16
Views: 323

Re: Experiences with 4G broadband

one day it will all backfire, & the universe will implode :lol: Pretty sure current thinking is the universe will expand forever but eventually be stone cold and dark. Bit like the cupboard under the stairs. I had a dream, which was not all a dream. The bright sun was extinguishd, and the stars Did...
by BigEd
Fri Sep 13, 2019 8:55 am
Forum: other vintage computer hardware, software and games
Topic: ZX Spectrum next... Anybody backing ?
Replies: 143
Views: 13806

Re: ZX Spectrum next... Anybody backing ?

(That is, tape images on sdcard fed from a Pi into a micro (by audio? Or by DMA? Could be a role for Dominic's 1MHz Pi))
by BigEd
Wed Sep 11, 2019 5:06 pm
Forum: projects
Topic: steve30's Home Energy Monitor Project
Replies: 6
Views: 287

Re: steve30's Home Energy Monitor Project

Nice project! Any idea, those in the know, as to how much difference the power factor business makes - is it more or less than 10% for example?
by BigEd
Sat Sep 07, 2019 12:30 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 217
Views: 7277

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019. 1 NO-KIT SPACE AVAILABLE

(In other contexts I go by 'Ed S', and perhaps an initial might help to disambiguate all the Jasons, Marks, Robs, and Daves, without giving away identity. Or it might remain ambiguous! Edit: or maybe first name is enough anyway, for conversational purposes. Surely it is.)
by BigEd
Wed Sep 04, 2019 7:57 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 110
Views: 6077

Re: Raspberry Pi to 1MHz bus interface

I think you might just need to be patient for a bit: dp11 has lots going on.
by BigEd
Wed Sep 04, 2019 11:44 am
Forum: software & utilities for the pc, mac or unix
Topic: BBC BASIC for SDL 2.0 version 1.06a released
Replies: 3
Views: 231

Re: BBC BASIC for SDL 2.0 version 1.06a released

Very impressive! (I was going to ask for some screenshots...)
by BigEd
Wed Sep 04, 2019 11:42 am
Forum: programming
Topic: Specific ELECTRON Scans Wanted.
Replies: 5
Views: 205

Re: Specific ELECTRON Scans Wanted.

If you upload a zip file named anything_images.zip to archive.org, it will build a PDF for you, with OCR, and also present a flipbook version on the web.

https://help.archive.org/hc/en-us/artic ... ake-a-book
by BigEd
Sun Sep 01, 2019 7:31 pm
Forum: software: games - high scores
Topic: High Score Challenge S12 - R5 - 2048
Replies: 54
Views: 1120

Re: High Score Challenge S12 - R5 - 2048

I have a new idea...
... and a new personal best.
Screen Shot 2019-09-01 at 20.28.32.png
by BigEd
Sun Sep 01, 2019 7:30 pm
Forum: hardware
Topic: Hmm.. was there ever an 8" floppy drive for the BBC?
Replies: 39
Views: 1098

Re: Hmm.. was there ever an 8" floppy drive for the BBC?

It makes sense - no stepper motors, so slow to get a stable spin speed, so best to rotate constantly, and then use the head-load signal to bring the heads to the disk only when needed. Less wear!
by BigEd
Thu Aug 29, 2019 11:09 am
Forum: off-topic
Topic: BBC to launch digital voice assistant
Replies: 4
Views: 245

Re: BBC to launch digital voice assistant

The wake-word is 'Beeb' - that might work well for everyone except the people who hang out on Stardot...
by BigEd
Wed Aug 28, 2019 8:51 pm
Forum: software: games - high scores
Topic: High Score Challenge S12 - R5 - 2048
Replies: 54
Views: 1120

Re: High Score Challenge S12 - R5 - 2048

KarateEd wrote:
Tue Aug 27, 2019 7:28 pm
... nicely done, now do it again and prove it wasn't a fluke....and, get an even higher score.
I'm as surprised as anyone, but here it is:
Screen Shot 2019-08-28 at 21.50.07.png
by BigEd
Tue Aug 27, 2019 7:31 pm
Forum: software: games - high scores
Topic: High Score Challenge S12 - R5 - 2048
Replies: 54
Views: 1120

Re: High Score Challenge S12 - R5 - 2048

I do need a bit of luck in this game... I'll see if I can do it again!
by BigEd
Tue Aug 27, 2019 6:22 pm
Forum: software: games - high scores
Topic: High Score Challenge S12 - R5 - 2048
Replies: 54
Views: 1120

Re: High Score Challenge S12 - R5 - 2048

Hmm something unexpected happened here:
Screen Shot 2019-08-27 at 19.21.26.png
(I'll admit I've spent way too much time playing variants of 2048)
by BigEd
Tue Aug 27, 2019 6:10 am
Forum: software: games - high scores
Topic: High Score Challenge S12 - R5 - 2048
Replies: 54
Views: 1120

Re: High Score Challenge S12 - R5 - 2048

Another go...
Screen Shot 2019-08-27 at 07.09.17.png
by BigEd
Mon Aug 26, 2019 10:18 pm
Forum: software: games - high scores
Topic: High Score Challenge S12 - R5 - 2048
Replies: 54
Views: 1120

Re: High Score Challenge S12 - R5 - 2048

oh, something I can join in on!
Screen Shot 2019-08-26 at 23.17.03.png
by BigEd
Fri Aug 23, 2019 6:42 am
Forum: hardware
Topic: Fixed: Mode 7 intermittent lines
Replies: 40
Views: 1016

Re: Mode 7 intermittent lines

I've a feeling one of my machines had a band of noise, and it turned out there was a dry joint inside the power supply. One of the big capacitors sent the message that it still had lots of charge when Dave (hoglet) tried to resolder it.
by BigEd
Fri Aug 23, 2019 6:39 am
Forum: hardware
Topic: BBC clock speed
Replies: 23
Views: 756

Re: BBC clock speed

No worries Rob! (One difficulty that's all my own is trying to keep track of the doublings and halvings - you can't get the right answer otherwise. But also, it's something of a coincidence that the active area is almost (but not quite) the same as half of the frame time, and part of the same coinci...
by BigEd
Wed Aug 21, 2019 8:58 pm
Forum: other vintage computer hardware, software and games
Topic: Early 70s Calculators
Replies: 52
Views: 4891

Re: Early 70s Calculators

You're only supposed to try cos between 0 and pi/2 - check the manual! It's a miracle the thing works as well as it does, given the constraints.
http://www.datamath.net/Manuals_Others/ ... fic_GB.pdf
by BigEd
Tue Aug 20, 2019 6:45 pm
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 261
Views: 29709

Re: Remarkable videos recently posted on Youtube

Chris Turner features in this short OU video about the "fourth generation" of computers - the micro. (previous generations: Colossus, Elliott 803, ICL 2900 - all in the same playlist.) https://i.ytimg.com/vi/xSc4ed3h5Ks/hqdefault.jpg (Later in the playlist, some short audio-only non-videos on Turing.)
by BigEd
Sun Aug 18, 2019 8:43 pm
Forum: general
Topic: The Computer Programme (TV) - High quality video?
Replies: 6
Views: 201

Re: The Computer Programme (TV) - High quality video?

Mmm. Probably the best quality that could be found for the archive. I've a feeling there's been a previous conversation about the technicalities: is it perhaps incorrectly converted, for example?