Today I received.....

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

Post by danielj » Thu Nov 14, 2019 10:27 pm

tricky wrote:
Thu Nov 14, 2019 10:20 pm
Where did you get that, every time I look, there is another £30 P&P to the UK.
So, the pt-65-b is +5V +12V -12V - but similarly the one for the beeb can be purchased from the excellent UK distributers of all that is Mean Well:
https://www.powersuppliesonline.co.uk/p ... upply.html
:)

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klintworth
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Re: Today I received.....

Post by klintworth » Fri Nov 15, 2019 6:32 pm

Superfast delivery to Canada - thanks Daniel!
IMG_4774.jpg
BBC B Issue 4 & 7, BBC B (USA), BBC Master, Electron, BBC Master Compact, Olivetti PC128S, Castle A7000+, A3020

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danielj
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Re: Today I received.....

Post by danielj » Fri Nov 15, 2019 6:46 pm

Wow, that was spectacularly fast :) Let me know how you get on!
d.

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BigEd
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Re: Today I received.....

Post by BigEd » Sat Nov 16, 2019 1:00 pm

Thanks to a tip-off from Dave/@hoglet, I am now a proud owner of a four volume boxed set, retail price £4.95 in 1977, being the Program Library for Sinclair's Cambridge Programmable calculator (just £17.23 new, not that I have one.)
IMG_2180_.jpg

chrisn
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Re: Today I received.....

Post by chrisn » Sat Nov 16, 2019 1:14 pm

Something interesting to read...

creativesound.jpg

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Leew
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Re: Today I received.....

Post by Leew » Wed Nov 20, 2019 9:44 am

...Primes Plus 3 RAM/ROM Board (well technically not today, a few days ago...)

Thanks to Dave H for supplying the kit which I have built and installed and thanks to prime for designing it :-)

Not only do I have ADFS at &E00, but a 128k Electron to boot (when I plug Dave's ABR in). That's impressive :-D

IMG_20191120_093054.jpg
IMG_20191119_221454.jpg
Lee W
------------
Proud owner of many Electrons, some Beebs, a couple of Archies, some Commodore 64s, Amigas, Atari STs and an Atari Falcon 030
Lemmings are for life, not just the 90's... https://www.lemmingsworld.me

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daveejhitchins
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Re: Today I received.....

Post by daveejhitchins » Wed Nov 20, 2019 1:10 pm

Leew wrote:
Wed Nov 20, 2019 9:44 am
Not only do I have ADFS at &E00, but a 128k Electron to boot (when I plug Dave's ABR in). That's impressive :-D
Nice set-up =D>

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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jonb
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Re: Today I received.....

Post by jonb » Thu Nov 21, 2019 1:05 pm

I've had a bit of a break in the "retrocomputer collection" madness, until now.


IMG_6311.jpg
A pair of Sharp pocket computers. PC-1211 and PC-1245.

IMG_6312.jpg
Epson HX-20 with expansion in its dinky Joe 90 briefcase.


I wanted the HX-20 as it was one of the first machines I wrote commercial software for. All three of them are sold as "untested" so basically parts only, but I think it is possible I can resurrect the HX-20. The other two I'm not so sure... The PC-1211 looks like it has a dead display so I expect that will be sold for parts at some point! The PC-1245 is interestingly dinky with its built in micro cassette player. Just look at those diddy little keys!

None of them have PSUs and it is highly likely the NiCad batteries in the HX-20 have expired. I found instructions to resurrect it though..

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

Post by Lardo Boffin » Thu Nov 21, 2019 3:12 pm

A working C64 thanks to Dave H!!! Plus a whole bunch of other bits as well which I will look at tonight. :D

516A7619-321B-4871-9D12-BF897FD9F091.jpeg
Atom, issue 5
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
USA Model B
BBC Master, Datacentre + HDD, pi co-proc, econet, NULA

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danielj
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Re: Today I received.....

Post by danielj » Thu Nov 21, 2019 3:19 pm

Lardo Boffin wrote:
Thu Nov 21, 2019 3:12 pm
A working C64 thanks to Dave H!!! Plus a whole bunch of other bits as well which I will look at tonight. :D


516A7619-321B-4871-9D12-BF897FD9F091.jpeg
Check the voltages on that PSU!

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

Post by 1024MAK » Thu Nov 21, 2019 3:54 pm

danielj wrote:
Thu Nov 21, 2019 3:19 pm
Lardo Boffin wrote:
Thu Nov 21, 2019 3:12 pm
A working C64 thanks to Dave H!!!
Check the voltages on that PSU!
It’s only the +5V that causes problems (when the series pass regulator cooks itself inside it’s resin tomb, the output may rise towards 9V and try to kill the connected C64 :shock: ).

When poking probes into the plug, be very careful you don’t short anything!

Mark

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

Post by Lardo Boffin » Thu Nov 21, 2019 4:13 pm

danielj wrote:
Thu Nov 21, 2019 3:19 pm
Lardo Boffin wrote:
Thu Nov 21, 2019 3:12 pm
A working C64 thanks to Dave H!!! Plus a whole bunch of other bits as well which I will look at tonight. :D


516A7619-321B-4871-9D12-BF897FD9F091.jpeg
Check the voltages on that PSU!
Thanks! Its a brand new PSU which impressively arrived from Poland the same day the C64 arrived. Spooky.
Atom, issue 5
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
USA Model B
BBC Master, Datacentre + HDD, pi co-proc, econet, NULA

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CMcDougall
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Re: Today I received.....

Post by CMcDougall » Thu Nov 21, 2019 6:59 pm

jonb wrote:
Thu Nov 21, 2019 1:05 pm
the HX-20
rip batts out before it ruins the LCD blue ribbon like my two!!

If you find City Bomber on one of the tapes, get it upped!!

See here :


viewtopic.php?f=45&t=13893#p183018
ImageImageImage

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jonb
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Re: Today I received.....

Post by jonb » Thu Nov 21, 2019 7:32 pm

Too late I expect. Haven’t opened it up yet..

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klintworth
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Re: Today I received.....

Post by klintworth » Fri Nov 29, 2019 5:26 am

5.jpeg
An A3020 via ebay.
1.jpeg
First task - take out old battery
3.jpeg
Clean up battery damage on both sides of motherboard with white vinegar, then distilled water
4.jpeg
Attach new battery (in an accessible place!)
2.jpeg
Test switch on - hooray!

Next steps - cosmetic attention, also looking forward to exploring hard drive options!
BBC B Issue 4 & 7, BBC B (USA), BBC Master, Electron, BBC Master Compact, Olivetti PC128S, Castle A7000+, A3020

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danielj
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Re: Today I received.....

Post by danielj » Fri Nov 29, 2019 6:38 am

Phew! Lucky! Nice find :)

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flaxcottage
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Re: Today I received.....

Post by flaxcottage » Fri Nov 29, 2019 10:09 am

That looks to be a lovely clean example now. Well done. =D>
- John

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markjw
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Re: Today I received.....

Post by markjw » Sat Nov 30, 2019 3:53 pm

another Sinclair machine to add to my collection, a ZX81 which was the first computer I ever owned - boots up and responds to the keyboard, however the power socket is a bit dodgy. Will have to replace the power socket and do the composite video mod at some point
ZX81.jpg
so now have a ZX80, ZX81, rubber key Spectrum, Spectrum Plus and Spectrum 128K+2

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

Post by 1024MAK » Sat Nov 30, 2019 4:27 pm

Resolder the connections and retention the contacts (http://www.worldofspectrum.org/Spectrum ... de/#retsoc).

Mark

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Re: Today I received.....

Post by markjw » Sat Nov 30, 2019 6:43 pm

1024MAK wrote:
Sat Nov 30, 2019 4:27 pm
Resolder the connections and retention the contacts (http://www.worldofspectrum.org/Spectrum ... de/#retsoc).

Mark
thanks for the link - I'll give it a try. Also want to see if I can find a more 'OEM' cable to fit to the psu (ie with molded jack plug) as the original one has been replaced at some point. Wonder if a mono 3.5mm audio cable would be OK, chop the other end off and solder into the PSU.

Mark

Kazzie
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Re: Today I received.....

Post by Kazzie » Sat Nov 30, 2019 6:44 pm

markjw wrote:
Sat Nov 30, 2019 3:53 pm
another Sinclair machine to add to my collection, a ZX81 which was the first computer I ever owned - boots up and responds to the keyboard, however the power socket is a bit dodgy.
The ZX81 is the first home micro I ever programmed, albeit in 2003. It was my high school's first ever computer, and was brought out of the science storeroom on the occasion of the school's 50th anniversary. For an open evening, I wired it up to a telly and wrote a BASIC program to plot the distance covered by a projectile fired at a given angle, and plot the curve of its motion. That filled pretty much all of its 1K RAM, though!
BBC Model B 32k issue 7, Sidewise ROM board with 16K RAM
Archimedes 420/1 upgraded to 4MB RAM, ZIDEFS with 512MB CF card
Acorn System 1 home-made replica

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

Post by 1024MAK » Sat Nov 30, 2019 7:10 pm

markjw wrote:
Sat Nov 30, 2019 6:43 pm
Also want to see if I can find a more 'OEM' cable to fit to the psu (ie with molded jack plug) as the original one has been replaced at some point. Wonder if a mono 3.5mm audio cable would be OK, chop the other end off and solder into the PSU.
I’m not aware of any replacement moulded cables, but it’s worth a look on SellMyRetro, eBay and other electronic suppliers, as there are other devices which also used a 3.5mom jack socket for power. Try a search using “Mono 3.5mm plug bare ends”.
Alternatively you could obtain another ZX PSU.

An audio cable may work if just powering a ZX81, but they may be an excessive voltage loss if you try powering expansions as well. Cheap audio cables are not known for using much copper in the cable...

Mark

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JudgeBeeb
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Re: Today I received.....

Post by JudgeBeeb » Sat Nov 30, 2019 7:31 pm

1024MAK wrote:
Sat Nov 30, 2019 7:10 pm
An audio cable may work if just powering a ZX81, but they may be an excessive voltage loss if you try powering expansions as well. Cheap audio cables are not known for using much copper in the cable...
Shouldn't get much of a voltage drop with one of these: https://www.futureshop.co.uk/wireworld- ... jack-cable
There is so much wonder in the universe; why should you want to imagine that there is more?

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

Post by 1024MAK » Sat Nov 30, 2019 7:44 pm

JudgeBeeb wrote:
Sat Nov 30, 2019 7:31 pm
1024MAK wrote:
Sat Nov 30, 2019 7:10 pm
An audio cable may work if just powering a ZX81, but they may be an excessive voltage loss if you try powering expansions as well. Cheap audio cables are not known for using much copper in the cable...
Shouldn't get much of a voltage drop with one of these: https://www.futureshop.co.uk/wireworld- ... jack-cable
Okay, who’s brave enough to tell them that you want a mono version... :lol:

Mark

markjw
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Re: Today I received.....

Post by markjw » Sat Nov 30, 2019 10:29 pm

1024MAK wrote:
Sat Nov 30, 2019 7:44 pm
JudgeBeeb wrote:
Sat Nov 30, 2019 7:31 pm
1024MAK wrote:
Sat Nov 30, 2019 7:10 pm
An audio cable may work if just powering a ZX81, but they may be an excessive voltage loss if you try powering expansions as well. Cheap audio cables are not known for using much copper in the cable...
Shouldn't get much of a voltage drop with one of these: https://www.futureshop.co.uk/wireworld- ... jack-cable
Okay, who’s brave enough to tell them that you want a mono version... :lol:

Mark
ok, who wants to order one and let me know what it works like :)

good point on the voltage drop - alternative would be to find an old / broken psu that has a good cable
Mark

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

Post by 1024MAK » Sat Nov 30, 2019 10:45 pm

There is a white version on eBay...

Or if you want black, there is one in the USA, but it’s a bit pricey by the time you include shipping :roll:

Mark

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marcusjambler
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Re: Today I received.....

Post by marcusjambler » Sun Dec 01, 2019 12:57 am

do the composite video mod at some point
simple mod only works with issue 3.... back porch required

Marcus

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

Post by Lardo Boffin » Sun Dec 01, 2019 8:09 am

marcusjambler wrote:
Sun Dec 01, 2019 12:57 am
do the composite video mod at some point
simple mod only works with issue 3.... back porch required

Marcus
Get a ZX8-CCB from Sell My Retro. They do a superb job.
Atom, issue 5
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
USA Model B
BBC Master, Datacentre + HDD, pi co-proc, econet, NULA

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

Post by 1024MAK » Sun Dec 01, 2019 11:27 am

marcusjambler wrote:
Sun Dec 01, 2019 12:57 am
do the composite video mod at some point
simple mod only works with issue 3.... back porch required
The board issue is not the factor here, the factor is which ULA version is fitted. There are three ULA versions. The first two versions did not generate the part of the video signal known as the “back porch” because monochrome (black and white) TVs did not need it. Sinclair then introduced an improved and final ULA version. This ULA does generate the “back porch”.

There are a number of different composite video circuits / modifications. Does your telly need the “back porch”? This very much depends on your telly. Some do, some don’t seem to care. The problem is you won’t know until you try it...

Lots of help and information about ZX81s over on Sinclair ZX World ;-)

Mark

markjw
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Re: Today I received.....

Post by markjw » Sun Dec 01, 2019 11:46 am

1024MAK wrote:
Sun Dec 01, 2019 11:27 am
marcusjambler wrote:
Sun Dec 01, 2019 12:57 am
do the composite video mod at some point
simple mod only works with issue 3.... back porch required
The board issue is not the factor here, the factor is which ULA version is fitted. There are three ULA versions. The first two versions did not generate the part of the video signal known as the “back porch” because monochrome (black and white) TVs did not need it. Sinclair then introduced an improved and final ULA version. This ULA does generate the “back porch”.

There are a number of different composite video circuits / modifications. Does your telly need the “back porch”? This very much depends on your telly. Some do, some don’t seem to care. The problem is you won’t know until you try it...

Lots of help and information about ZX81s over on Sinclair ZX World ;-)

Mark
I've ordered up a couple of the ZX8-CCB boards - one for my ZX81 and the 2nd for the ZX80 - cheap enough to buy and looks to be quite a neat install

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