Econet Micro Guide by Christopher Dawkins

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dangardner
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Econet Micro Guide by Christopher Dawkins

Post by dangardner » Tue Nov 13, 2012 8:48 pm

I just spotted this on Abebooks (thanks to Advance in another thread!) and remember it as being a very useful Econet reference, with information that could not be found elsewhere in the Econet AUG or other publicly available sources.

Before I buy it to scan for posterity and my own re-edification, does anybody have scans of this already? A quick Google didn't turn up anything much beyond a reference to the book by jgh. Failing that, does anybody have any good tips on scanning books and/or free OCR software for Windows?

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Advance
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Re: Econet Micro Guide by Christopher Dawkins

Post by Advance » Tue Nov 13, 2012 9:21 pm

Glad that teasing Martin had such a good result. I for one will look out for those scans.
Can't help wondering if I've shot myself in the foot by plugging that site, though - there's enough competition for Beeb stuff on ebay.
Hugh

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jgharston
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Re: Econet Micro Guide by Christopher Dawkins

Post by jgharston » Sun Nov 18, 2012 10:46 am

dangardner wrote:I just spotted this on Abebooks ...
Before I buy it to scan for posterity and my own re-edification, does anybody have scans of this already?
It's quite a good book, I have a copy. It's 100 A5 pages, I could scan it if nobody else has.
Failing that, does anybody have any good tips on scanning books and/or free OCR software for Windows?
I use an EPSON DX-5000 printer/scanner for scanning and FineReader for OCR-ing. Text will happily scan and OCR at 300dpi. For diagrams I scan at 600dpi 256 colour greyscale, then using PaintShopPro I resample down to one of:
A3 4096 pixels long side (eg Z80 CoPro)
A4 2048 pixels short side for high detail
A4 1024 pixels short side for low detail (eg LCD)
A5 2048 pixels long side for high detail (eg JGH-MIDI)
A5 1024 pixels long side for low detail detail (eg Border Colour)

I then reduce the colours down to 16, then manually pull up/push down the outlying greys to full black/white until I have only four greys. I then change the colour depth back up to 256 and back down to 16 to merge all the recoloured greys into four.

For example, after reducing down to 16 greys I could have a pallette of:

00 10 20 30 40 50 60 70 80 90 A0 B0 C0 D0 E0 F0

I change the pallet to be, for example:

00 00 00 00 00 00 00 70 80 F0 F0 F0 F0 F0 F0 F0

Changing the number of colours up to 256 and back down to 16 gives a palette of

00 70 80 F0 F0 F0 F0 F0 F0 F0 F0 F0 F0 F0 F0 F0

and what used to be, for example, a run of different logical colours with the same physical colour (eg 0 1 1 2 1 1 1 0 1 2 2 1 1) becomes a run of the same logical colour (eg 0 0 0 0 0 0 0 0 0 0 0 0 0); which, as I save the images as a compressed file (usually GIF) results in much smaller files.

Code: Select all

$ bbcbasic
PDP11 BBC BASIC IV Version 0.32
(C) Copyright J.G.Harston 1989,2005-2020
>_

dangardner
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Re: Econet Micro Guide by Christopher Dawkins

Post by dangardner » Sun Nov 18, 2012 3:21 pm

Thanks for all the advice! Since nobody seemed to be replying, I bought the book anyway in case it disappeared :)

I've got an HP ScanJet 4070 which does 2400dpi, so it should do the job. I'll have a go at scanning it myself and if the results are awful, I might ask for some assistance, if you don't mind.

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Re: Econet Micro Guide by Christopher Dawkins

Post by Advance » Sun Nov 18, 2012 4:33 pm

Check your PMs.

fleetstreet
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Re: Econet Micro Guide by Christopher Dawkins

Post by fleetstreet » Thu Sep 05, 2013 1:08 am

Is there an image of the cover? I'm trying to find a book I had in school, this might be it.

I'll happily take a scanned copy :D

matt_nottm
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Re: Econet Micro Guide by Christopher Dawkins

Post by matt_nottm » Tue Feb 14, 2017 9:24 pm

Does anyone have a scanned PDF of the Econet Micro Guide by Christopher Dawkins? It is circa £60 on eBay and even more on Amazon?

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Re: Econet Micro Guide by Christopher Dawkins

Post by matt_nottm » Sun Mar 25, 2018 1:58 pm

* BUMP *


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jgharston
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Re: Econet Micro Guide by Christopher Dawkins

Post by jgharston » Sun Mar 25, 2018 4:25 pm

lurkio wrote:Added to the list of missing manuals: :idea:
Ok, I'll scan it when I get home.

Code: Select all

$ bbcbasic
PDP11 BBC BASIC IV Version 0.32
(C) Copyright J.G.Harston 1989,2005-2020
>_

matt_nottm
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Re: Econet Micro Guide by Christopher Dawkins

Post by matt_nottm » Sun Mar 25, 2018 4:27 pm

You are a star, thank you!

fleetstreet
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Re: Econet Micro Guide by Christopher Dawkins

Post by fleetstreet » Mon Feb 24, 2020 10:20 am

Did the scan happen? It's still listed on the Missing page.

matt_nottm
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Re: Econet Micro Guide by Christopher Dawkins

Post by matt_nottm » Mon Feb 24, 2020 2:27 pm

I've not managed to find a copy anywhere to scan.

When I was hunting for other Econet things, I did get a copy of "Networking with the BBC Microcomputer" by R.G.Napier which I have a scan of. It is a little too large to upload here at 9.5MB, even as a web optimised PDF. :-(

WrightStuff
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Re: Econet Micro Guide by Christopher Dawkins

Post by WrightStuff » Sun Mar 29, 2020 4:23 pm

Any sign of a scan for this ?
Can't even see any physical copies anywhere now.
The info I'm after is the control block structure for various messages between client and server. I don't recall seeing this documented anywhere else.
E.g. server response to *I AM

Thanks.

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jgharston
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Re: Econet Micro Guide by Christopher Dawkins

Post by jgharston » Sun Mar 29, 2020 8:36 pm

WrightStuff wrote:
Sun Mar 29, 2020 4:23 pm
Any sign of a scan for this ?
I've been scanning it in as part of my isolation sanity-preservation strategy. ;) In between programming, cutting down trees, and weeding the lawn.
WrightStuff wrote:
Sun Mar 29, 2020 4:23 pm
The info I'm after is the control block structure for various messages between client and server. I don't recall seeing this documented anywhere else.
E.g. server response to *I AM
http://mdfs.net/System/Library/BLib/Docs/NetFS.txt
http://mdfs.net/Docs/Comp/Econet/
http://beebwiki.mdfs.net/Category:Networking
http://mdfs.net/Docs/Books/SJMDFS/Chapter10 (tho' the bit you want is unformatted - ah ha! another task!)

Code: Select all

$ bbcbasic
PDP11 BBC BASIC IV Version 0.32
(C) Copyright J.G.Harston 1989,2005-2020
>_

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jgharston
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Re: Econet Micro Guide by Christopher Dawkins

Post by jgharston » Tue Mar 31, 2020 9:11 pm

The Econet Micro Guide, Christopher Dawkins, Longman Micro Guides:
http://mdfs.net/Docs/Books/Econet/MicroGuide.pdf 4.20G

Finally got through the first "scanning" pile. :) Over time I'll OCR it to reduce the size.

Code: Select all

$ bbcbasic
PDP11 BBC BASIC IV Version 0.32
(C) Copyright J.G.Harston 1989,2005-2020
>_

WrightStuff
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Re: Econet Micro Guide by Christopher Dawkins

Post by WrightStuff » Tue Mar 31, 2020 9:40 pm

Superb!, thanks a lot for taking the time to scan that =D>

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Re: Econet Micro Guide by Christopher Dawkins

Post by matt_nottm » Wed Apr 01, 2020 8:37 am

Excellent, thank you, I'll enjoy reading it this week. :D

SteveBagley
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Re: Econet Micro Guide by Christopher Dawkins

Post by SteveBagley » Wed Apr 01, 2020 11:25 am

This brings back some fond memories of borrowing this from the local library in the 1990s…

Some interesting comments in there though, specifically about Econet being ported to other machines in Appendix 1:
Econet hardware has been implemented for the Apple II, the Nascoms 1 and 2, the Research Machines 380Z and 480Z, S-100 bus machines and all Acorn computers, but only the last four are commercially available.
I wasn't aware that S100 Econet cards had been produced, I wonder if any survived… It further states:
The 380Z /480Z / S-100 interfaces have the same line driver, receiver, collision and idle detect circuitry as the BBC - which at least ensures electrical compatibility - but the ADLC functions are performed by the SIO chip. Only about half the hardware on the 380Z board is required for the Econet: the rest is a 64K RAM expansion and a ROM socket, with the necessary decoding for the RAM to be paged as required. One important use for this paged RAM is when the 380Z is acting as a fileserver - the RAM on the Econet board then pro vides cache memory which considerably speeds up fileserver operation.
Interesting stuff. There's also a reference to Barson Computers again, which maybe of interest to the other thread…

Steve

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