Today I received.....

on-topic Acorn-related news and discussions not covered by the other forums
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jonb
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Re: Today I received.....

Post by jonb » Thu Jun 21, 2018 6:35 am

hoglet wrote:
Wed Jun 20, 2018 3:35 pm
jonb wrote:
Wed Jun 20, 2018 3:29 pm
But the big question is, how much was it? :D
You really want to know?

...

OK then, it was £3.00 to get in.
Ha ha nice one Dave!

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hoglet
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Re: Today I received.....

Post by hoglet » Thu Jun 21, 2018 6:49 am

jonb wrote:
Thu Jun 21, 2018 6:35 am
Ha ha nice one Dave!
I had the opportunity at the rally to power up the scope and run through the self tests (one warning on the FISO test). So I knew what I was getting into, and eventually ended up paying £150 for the scope (he was originally asking £250). The seller was a dealer of used test equipment (GPTE International).
Last edited by hoglet on Thu Jun 21, 2018 6:55 am, edited 3 times in total.

cmorley
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Re: Today I received.....

Post by cmorley » Thu Jun 21, 2018 7:19 am

hoglet wrote:
Thu Jun 21, 2018 6:49 am
eventually ended up paying £150 for the scope (he was originally asking £250).
So you bought 4 high end second hand scope probes for £37.50 each and got a scope for free. Bargain!

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hoglet
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Re: Today I received.....

Post by hoglet » Thu Jun 21, 2018 7:57 am

cmorley wrote:
Thu Jun 21, 2018 7:19 am
So you bought 4 high end second hand scope probes for £37.50 each and got a scope for free. Bargain!
Unfortunately not. I had the scope probes already - they came with the 54622D (my main day-to-day scope / logic analyzer).

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Lardo Boffin
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Re: Today I received.....

Post by Lardo Boffin » Thu Jun 21, 2018 8:29 am

A disc cleaner frame, some lint free cloths and by coincidence some discs of unknown pedigree that I can practice on before trying any of the more expensive ones.

The video link from the purchase suggested using rubbing alocohol (IPA?) but advice on here was distilled water - which is the best way forward?

8EAB256A-9C1B-456A-B18A-FB3EFC03C98B.jpeg
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

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daveejhitchins
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Re: Today I received.....

Post by daveejhitchins » Thu Jun 21, 2018 9:36 am

Lardo Boffin wrote:
Thu Jun 21, 2018 8:29 am
The video link from the purchase suggested using rubbing alocohol (IPA?) but advice on here was distilled water - which is the best way forward?
Distilled water isn't going to 'kill' any mould, just wipe if off. IPA

Dave H :D
Parts: UM6502CE, GAL22V10D, GAL16V8D, AS6C62256A, TC514400AZ, WD1772, R6522, TMS27C512, AT28C256
Products: ARA II, ARA III, 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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Elminster
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Re: Today I received.....

Post by Elminster » Thu Jun 21, 2018 10:28 am

Wouldnt killing mold with distilled water be like trying to put out a fire with a sock?

Edit: I use mold killer from Lakeland on my walls, probably best not to use on floppy disks but it is good stuff. So IPA sounds good.
Last edited by Elminster on Thu Jun 21, 2018 10:29 am, edited 2 times in total.

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1024MAK
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Re: Today I received.....

Post by 1024MAK » Thu Jun 21, 2018 5:02 pm

Water is a solvent. IPA is a solvent. Different "dirt" dissolves in different solvents... See this Wikipedia article.
So probably you need both! Start with the distilled water and unscented ordinary soap, wash with distilled water, then after dry, clean with IPA :wink:

Mark
Last edited by 1024MAK on Thu Jun 21, 2018 5:03 pm, edited 1 time in total.

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danielj
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Re: Today I received.....

Post by danielj » Thu Jun 21, 2018 5:28 pm

Trichloroethane :)

d.

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Elminster
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Re: Today I received.....

Post by Elminster » Mon Jun 25, 2018 12:57 pm

Possibly bid against someone on here, but rare so many books come up on email [ebay] at the same time that I dont have (at a sensible price anyway).
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Last edited by Elminster on Wed Jun 27, 2018 10:51 pm, edited 2 times in total.

bear
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Re: Today I received.....

Post by bear » Wed Jun 27, 2018 10:31 pm

You're likely to find that IPA will wipe the data off along with the dirt.

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flaxcottage
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Re: Today I received.....

Post by flaxcottage » Sat Jun 30, 2018 1:02 pm

Some of these for my Plotmate A4
IMAG1293.jpg

They work a treat! :D =D>
IMAG1292.jpg

Mind you they are pretty expensive as they have to be specially made since they are no longer a stock item. I chose black ones but they can be ordered in red, green, blue, etc. to match the BBC micro's colour set.

All I need now is someone to have the Plotmate A4 ROM and post it on the forum [-o<
Last edited by flaxcottage on Sat Jun 30, 2018 1:02 pm, edited 1 time in total.
- John
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1024MAK
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Re: Today I received.....

Post by 1024MAK » Sat Jun 30, 2018 1:03 pm

A new ZX81 ULA module from Andy.
IMG_7395.JPG
Andy's new 2018 ULA Module
Thanks Andy 8-) :D

Mark

markdryan
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Re: Today I received.....

Post by markdryan » Sat Jun 30, 2018 9:19 pm

Wednesday I received, a PC card for my RiscPC, PC DOS 7 and two DOS games, UFO and Syndicate.
PCCARD.JPG

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Elminster
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Re: Today I received.....

Post by Elminster » Mon Jul 02, 2018 9:48 am

I blame Daniel and Chris but I am now the ower of a set of these spudgers.
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flaxcottage
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Re: Today I received.....

Post by flaxcottage » Tue Jul 03, 2018 12:13 pm

A whole bunch of electronic goodness. :D

I bought this to go with my Raspberry Pi stuff. It also included an Arduino clone and a digital clock/thermometer, which were a complete surprise.
:
Electronic stuff.jpg
- John
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Elminster
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Re: Today I received.....

Post by Elminster » Mon Jul 09, 2018 9:20 am

Should have bought or made one of these years ago. Much easier to get keys off than my previous method.
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Multiwizard
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Re: Today I received.....

Post by Multiwizard » Mon Jul 09, 2018 10:07 am

Elminster wrote:
Mon Jul 09, 2018 9:20 am
Should have bought or made one of these years ago. Much easier to get keys off than my previous method.
Hi,

indeed it's one of the methods...

For decades (since the 80's) I like to do it (my) this way :D :

https://www.youtube.com/watch?v=sOdoO_cVDY4


Greetings, Wim... :-)

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Elminster
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Re: Today I received.....

Post by Elminster » Mon Jul 09, 2018 1:31 pm

Multiwizard wrote:
Mon Jul 09, 2018 10:07 am
Elminster wrote:
Mon Jul 09, 2018 9:20 am
Should have bought or made one of these years ago. Much easier to get keys off than my previous method.
Hi,

indeed it's one of the methods...

For decades (since the 80's) I like to do it (my) this way :D :

https://www.youtube.com/watch?v=sOdoO_cVDY4
That way works well if you start from the edge, if you just want to remove one key cap in the middle (i.e. you have a sticky key you want to squirt with contact cleaner), I find that using something like pliers etc can damage some of the caps. With above it is simple but causes no issue with surreounding key caps.

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flaxcottage
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Re: Today I received.....

Post by flaxcottage » Mon Jul 09, 2018 5:13 pm

That looks the business. So simple! :D
- John
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cmorley
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Re: Today I received.....

Post by cmorley » Mon Jul 09, 2018 5:48 pm

I too can vouch for the "whisk" type key cap pullers. They are cheap on eBay and work really well.

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Multiwizard
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Re: Today I received.....

Post by Multiwizard » Mon Jul 09, 2018 5:57 pm

Elminster wrote:
Mon Jul 09, 2018 1:31 pm

That way works well if you start from the edge, if you just want to remove one key cap in the middle (i.e. you have a sticky key you want to squirt with contact cleaner), I find that using something like pliers etc can damage some of the caps. With above it is simple but causes no issue with surreounding key caps.
I never had to replace/repair a key-cap in the middle... :)

And as far as I can tell I haven't damaged a key-cap yet, they just pop off easily... :D


Greetings, Wim... :-)

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flibble
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Re: Today I received.....

Post by flibble » Tue Jul 10, 2018 5:53 pm

Slightly off topic, but a new thing to turn into a raspberry pi case.
s-l1600.jpg
(Having a look at the boards inside, I found an intel 8085, 8155 (0.25KB RAM) and 8277 ROM)

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lcww1
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Re: Today I received.....

Post by lcww1 » Tue Jul 10, 2018 10:30 pm

ABA08CC6-E2ED-42FE-A933-5647B7413881.jpeg
Adventures with the BBC Microcomputer by
Wichert van Engelen
re this thread - viewtopic.php?f=40&t=7962&hilit=engelen

do the English versions of Adventure1 and Adenture2 still need uploading?

Commie_User
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Re: Today I received.....

Post by Commie_User » Tue Jul 10, 2018 10:38 pm

By that cover, do we assume there's a text adventure version of Attack Of The Mutant Camels??

https://www.youtube.com/watch?v=oqeONHBdE1o

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lcww1
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Re: Today I received.....

Post by lcww1 » Wed Jul 11, 2018 6:05 am

:lol: not quite! But as we have the code, there is an opportunity to undertake site directed mutagenesis - so who knows what strange new beast could be created.......

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MartinB
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Re: Today I received.....

Post by MartinB » Wed Jul 11, 2018 6:28 am

flibble wrote:Slightly off topic, but a new thing to turn into a raspberry pi case.

Interesting... it's an inertial nav system display & control head (familiarly INCDU) with that particular Litton example probably being very similar in age to the Beeb. It was a reasonably popular unit and was used in many larger civil airliners of the time.



.
Last edited by MartinB on Wed Jul 11, 2018 8:00 am, edited 2 times in total.

Andy1979
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Re: Today I received.....

Post by Andy1979 » Wed Jul 11, 2018 9:06 am

Cheap eBay EPROM programmer, a new 32k EPROM and some used 27C128 EPROMS. All I need now is my cheap eBay UV eraser and should be OK to burn some ROMs.

My Master Compact currently has one 32K socket free, and I can replace Interword with a 16K EPROM. I've found threads on here about combining 2 x 16K images into one 32K chip, but is it also possible to combine 2x8K and 1x16K ROM images?
IMG_6172.JPG

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1024MAK
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Re: Today I received.....

Post by 1024MAK » Wed Jul 11, 2018 9:43 am

Andy1979 wrote:
Wed Jul 11, 2018 9:06 am
I've found threads on here about combining 2 x 16K images into one 32K chip, but is it also possible to combine 2x8K and 1x16K ROM images?
Yes, you can combine two 8K byte ROM images into a single 16K byte EPROM. And also combine 2 x 8K ROMs with a 16K ROM. However there is a big problem with both.

With a 32K byte EPROM fitted in a Beeb, the CPU via the hardware treats it as two bank switched 16K ROMs. So you don't have to make any changes to the ROM images, as they all start at the same address as far as the CPU is concerned (this is different to the actual address that the data is stored in, in the EPROM).

Where as, for 16K EPROMs (ROMs), the CPU can access the whole 16K bytes. So if you combined two 8K byte images, one 8K byte ROM image would work, but the OS would not find the second 8K byte ROM image, as it's header would be displaced by 8K bytes and more importantly, all the code would be displaced by 8K bytes. So any absolute references within the ROM, would now be wrong. The same applies if you put 2 x 8K byte ROM images and a 16K ROM image in a 32K EPROM. One 8K byte ROM image would not work.

So if you have two 8K byte ROM images that you want to use, put them in a 32K byte EPROM as if they were 16K ROM images (that is pad the 8K byte ROM image upto 16384 bytes, then combine with the second padded image) :wink:

Mark
Last edited by 1024MAK on Wed Jul 11, 2018 9:44 am, edited 1 time in total.

Andy1979
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Re: Today I received.....

Post by Andy1979 » Wed Jul 11, 2018 1:17 pm

1024MAK wrote:
Wed Jul 11, 2018 9:43 am
So if you have two 8K byte ROM images that you want to use, put them in a 32K byte EPROM as if they were 16K ROM images (that is pad the 8K byte ROM image upto 16384 bytes, then combine with the second padded image) :wink:
Thanks Mark. Sounds like to make most use of the space I should put two 16K ROMS in the 32K, then that leaves me with more free 16K sockets to experiment with. Will have a play once the eraser gets here, and if I get stuck I'll start a separate thread.

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