Acorn Circuit Diagram Negatives - Recovery

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daveejhitchins
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Acorn Circuit Diagram Negatives - Recovery

Postby daveejhitchins » Sun Sep 27, 2015 3:37 pm

I received nine mounted negatives of Acorn Circuit Diagrams, yesterday.

Having spent some time scanning, today, I've come to the conclusion my scanner isn't up to the task! . . . It will only manage 3200 resolution and the results indicate it needs way more.

This is one I've been playing with:
Acorn PET Circuit.jpg
Note: This is output for screen at 72DPI, however, you can still see the issue with my low-res scanner.

The negatives need high resolution scanning, cleaning and then re-scanning. The first scan is just-in-case anything goes wrong with the cleaning process. If need be I'll have them done professionally, however, I'm sure someone on the Forum has the talent and equipment to do this?

What's a PET?

Dave H :D
Parts: UM6502CE, GAL22V10D, GAL16V8D, AS6C62256A, TC514400AZ, WD1772, R6522, TMS27C512, AT28C256
Products: ARA II, ABR, ATI, AP6, MGC, AP5 . . .
For a price list, contact me at: Retro Hardware AT dave ej hitchins DOT plus DOT com

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danielj
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Re: Acorn Circuit Diagram Negatives - Recovery

Postby danielj » Sun Sep 27, 2015 3:40 pm

Dave, I have a flatbed backlit photo scanner that does 4800x9600dpi?

d.

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1024MAK
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Re: Acorn Circuit Diagram Negatives - Recovery

Postby 1024MAK » Sun Sep 27, 2015 3:51 pm

An Acorn PET is a piece of test gear for testing BBC computers.

I forget what PET stands for, but the name is in some Acorn documentation that I have read. It may even be in the Beeb service manual.

Mark
For a "Complete BBC Games Archive" visit www.bbcmicro.co.uk NOW!
BeebWiki‬ - for answers to many questions...

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daveejhitchins
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Re: Acorn Circuit Diagram Negatives - Recovery

Postby daveejhitchins » Sun Sep 27, 2015 3:57 pm

danielj wrote:Dave, I have a flatbed backlit photo scanner that does 4800x9600dpi?

d.
Thanks for that, Daniel . . . One of the issues is the fact they are mounted so don't fit the usual negative carriers! They could be dis-mounted, I suppose . . . Didn't fancy trying this myself . . .

Hope you don't mind waiting to see if anyone has anything higher? I had a quick look around and some of todays offerings, in scanners**, go up to 6800x6800 - although not sure if this would be better that the one you have? I suppose you could position the neg to get the max resolution for the long side! In which case yours would be better?

** Then there's this offering "Up to 10,600 dpi input and 5,300 dpi output"

Dave H :D
Parts: UM6502CE, GAL22V10D, GAL16V8D, AS6C62256A, TC514400AZ, WD1772, R6522, TMS27C512, AT28C256
Products: ARA II, ABR, ATI, AP6, MGC, AP5 . . .
For a price list, contact me at: Retro Hardware AT dave ej hitchins DOT plus DOT com

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daveejhitchins
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Joined: Wed Jun 13, 2012 5:23 pm
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Re: Acorn Circuit Diagram Negatives - Recovery

Postby daveejhitchins » Sun Sep 27, 2015 4:00 pm

1024MAK wrote:An Acorn PET is a piece of test gear for testing BBC computers.
Thanks, Mark . . . I thought I'd heard the name somewhere.

Dave H :D
Parts: UM6502CE, GAL22V10D, GAL16V8D, AS6C62256A, TC514400AZ, WD1772, R6522, TMS27C512, AT28C256
Products: ARA II, ABR, ATI, AP6, MGC, AP5 . . .
For a price list, contact me at: Retro Hardware AT dave ej hitchins DOT plus DOT com

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flibble
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Re: Acorn Circuit Diagram Negatives - Recovery

Postby flibble » Sun Sep 27, 2015 4:09 pm

Given it's probably a microfilm format, perhaps a trip to the british library (assuming you've signed up as a reader (free)) is in order

http://www.bl.uk/reshelp/inrrooms/stp/c ... vcopy.html

Prime
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Re: Acorn Circuit Diagram Negatives - Recovery

Postby Prime » Sun Sep 27, 2015 4:15 pm

You guys probably already know this but.....

Also beware of comparing resolutions of scanners that you compare the native resolution, i.e. what the actual scanner can resolve, rather than interpolated resolution.

Cheers.

Phill.

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danielj
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Re: Acorn Circuit Diagram Negatives - Recovery

Postby danielj » Sun Sep 27, 2015 5:03 pm

Indeed Phill (I think mine interpolates up to 19,200dpi - but in truth I've never really tested it in earnest) - Dave, my flatbed's designed to take a variety of neg formats from 16mm thru 4"x5". For mounted things I just plop them straight in the middle of the 4"x5" holder and mask off with black card. I've done 110 through to old glass plates. It can do automatic dust removal on the scans (it does an infrared pass - but that doesn't work with silver based B&W, dye based will..) I've also got the gear for cleaning negatives. I'm very happy to give it a go - but do wait and see if anyone's got anything else that might go higher.

d.

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1024MAK
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Re: Acorn Circuit Diagram Negatives - Recovery

Postby 1024MAK » Sun Sep 27, 2015 5:35 pm

Acorn PET - Progressive Establishment Tester

"The purpose of the PET is to take an apparently lifeless computer and attempt to find out where the fault lies".

So now you know...

Mark
For a "Complete BBC Games Archive" visit www.bbcmicro.co.uk NOW!
BeebWiki‬ - for answers to many questions...

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daveejhitchins
Posts: 3617
Joined: Wed Jun 13, 2012 5:23 pm
Location: Newton Aycliffe, County Durham

Re: Acorn Circuit Diagram Negatives - Recovery

Postby daveejhitchins » Sun Sep 27, 2015 6:07 pm

1024MAK wrote:Acorn PET - Progressive Establishment Tester

"The purpose of the PET is to take an apparently lifeless computer and attempt to find out where the fault lies".
=D>
We need one of these to pass round the various members as and when needed :lol:

Another project . . . . :roll:

Dave H :D

@Daniel . . . I'll leave it a few days and then get them off to you, if nothing else has surfaced. They do need cleaning, badly. The 'blacks' aren't as good as they could be. I had the best results with a 1bit scan e.g. Black or White . . .
Parts: UM6502CE, GAL22V10D, GAL16V8D, AS6C62256A, TC514400AZ, WD1772, R6522, TMS27C512, AT28C256
Products: ARA II, ABR, ATI, AP6, MGC, AP5 . . .
For a price list, contact me at: Retro Hardware AT dave ej hitchins DOT plus DOT com


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