Today I built ...

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

Post by hoglet » Sat Nov 24, 2018 6:05 pm

Today I built something for my Atom...
IMG_1486.JPG
IMG_1487.JPG
IMG_1490.JPG
It works rather well. :D

Dave

bprosman
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Re: Today I built ...

Post by bprosman » Sat Nov 24, 2018 6:12 pm

Very interested in your posts about it Dave and see it working.

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oss003
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Re: Today I built ...

Post by oss003 » Sat Nov 24, 2018 8:51 pm

HDMI output for the Atom ...... 😳

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jonb
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Re: Today I built ...

Post by jonb » Mon Nov 26, 2018 12:44 pm

That is pretty cool, Dave. Nice one!

For my part I built a mystery device:


IMG_5053.jpg
Black sandwich anyone?
IMG_5049.jpg
Reset key, SD card slot (with card)
IMG_5050.jpg
VGA, PS/2 keyboard, Serial ports
IMG_5051.jpg
Power input & flat programming cable

There is a way to go yet. I have a RTC to fit and 1Mb of 10ns memory (it has 128k 50ns at the moment). But what is it?

bprosman
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Re: Today I built ...

Post by bprosman » Sat Dec 01, 2018 6:06 pm

Today I built a Godil adapter.

Having a "stubborn" 6502 and a Z80 machine "under construction" I was heavily interested in Dave/Hoglet's ICE-Txx.
Unfortunately the original Godil is not available anymore but the 2x50IDC connector version is :

https://shop.trenz-electronic.de/en/TE0 ... n-IDC?c=97

Having been in contact quite a lot over the last weeks with Dave I initially wanted to use my E-Pizza board instead together with Dave's level-shifter board.
https://www.ebay.com/itm/Xilinx-FPGA-Sp ... 1640406811?

This board still needs some work and I will continue this but as a plan B. For now I went for a "Quick and dirty" adapter board.
Using a SMD 40 IC socket, a pin-pin socket and an additional "normal" IC socket. The last one is just for protection of the pin-pin socket, in case a pin breaks its easy to replace. On the last picture it's jumpered for a 6502.
Godil_Adapter_Top.JPG
IMG_7663.JPG
IMG_7667.JPG
IMG_7668.JPG
IMG_7670.JPG

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1024MAK
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Re: Today I built ...

Post by 1024MAK » Sun Dec 02, 2018 10:47 am

bprosman wrote:
Sat Dec 01, 2018 6:06 pm
Today I built a Godil adapter.
Nice 8)
=D>

Mark

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1024MAK
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Re: Today I built ...

Post by 1024MAK » Sun Dec 02, 2018 10:47 am

jonb wrote:
Mon Nov 26, 2018 12:44 pm
For my part I built a mystery device:

...

But what is it?

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hoglet
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Re: Today I built ...

Post by hoglet » Sun Dec 02, 2018 11:21 am

bprosman wrote:
Sat Dec 01, 2018 6:06 pm
Today I built a Godil adapter.
This is really nice. Do you have it working yet?

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oss003
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Re: Today I built ...

Post by oss003 » Sun Dec 02, 2018 11:22 am

Looking good Bram, did you already test it?

Greetings
Kees

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jonb
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Re: Today I built ...

Post by jonb » Sun Dec 02, 2018 12:39 pm

1024MAK wrote:
Sun Dec 02, 2018 10:47 am

But what is it?
Nice clip Mark.

It's one of these: http://searle.hostei.com/grant/Multicomp/ mated to one of these: https://www.retrobrewcomputers.org/doku ... ii-c:start running one of these: http://obsolescence.wixsite.com/obsoles ... -demo-disk.

In essence, a CP/M box overclocked to 33Mhz with SD card and VGA+PS2 I/O (or RS-232 @ 115200 baud). The case is made from black plastic standoffs and a couple of bits of 12x12cm matte perspex. I'm going to fit 1MB of fast RAM and see if I can get it to 100Mhz.
Last edited by 1024MAK on Sun Dec 02, 2018 5:21 pm, edited 2 times in total.
Reason: Edit URL tags

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Re: Today I built ...

Post by bprosman » Sun Dec 02, 2018 3:00 pm

@Hoglet, Kees,

Will test it on my "minimum Atom" later this week. Still need to flash the right image in it, its a 500K Version.

Need to check which one that is on Github <hint> :wink:

Regards, Bram

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hoglet
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Re: Today I built ...

Post by hoglet » Sun Dec 02, 2018 3:12 pm

bprosman wrote:
Sun Dec 02, 2018 3:00 pm
Need to check which one that is on Github <hint> :wink:
There should be a binary release you can use:
https://github.com/hoglet67/AtomBusMon/releases

The version you need in the ZIP is:
ice_20170922_2245_073\godil_500\ice6502\ice6502.mcs

(That's assuming your adapter maintains the original GODIL pinout)

Dave

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Re: Today I built ...

Post by bprosman » Sun Dec 02, 2018 3:36 pm

(That's assuming your adapter maintains the original GODIL pinout)
Yes it does, took it from the original schematic. Thanks !

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1024MAK
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Re: Today I built ...

Post by 1024MAK » Sun Dec 02, 2018 5:23 pm

jonb wrote:
Sun Dec 02, 2018 12:39 pm
It's one of these: http://searle.hostei.com/grant/Multicomp/ mated to one of these: https://www.retrobrewcomputers.org/doku ... ii-c:start running one of these: http://obsolescence.wixsite.com/obsoles ... -demo-disk.

In essence, a CP/M box overclocked to 33Mhz with SD card and VGA+PS2 I/O (or RS-232 @ 115200 baud). The case is made from black plastic standoffs and a couple of bits of 12x12cm matte perspex. I'm going to fit 1MB of fast RAM and see if I can get it to 100Mhz.
Nice, especially how you have fitted them neatly together =D>

Mark

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jonb
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Re: Today I built ...

Post by jonb » Mon Dec 03, 2018 8:26 am

Thanks, Mark. I used the following items to build the "enclosure" as I couldn't find a real enclosure that looked good enough. I wanted something low profile with removable front / rear panels but there's nothing out there that isn't very expensive..
Total cost about £14 but there are spare feet and spacers.

A black steel mesh wrapped around it would be really pretty and make a true enclosure, if it was accurately shaped and invisibly fixed using the stays.

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Re: Today I built ...

Post by Ramtop » Mon Dec 03, 2018 6:03 pm

Two examples of my new development board for the Elk. EPROM, SRam and Flash sockets, 20 I/Os, and an SD card interface.

I built these last week, but was too lazy to take pictures until today :D
Attachments
esx1a.jpg
Gary

cmorley
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Re: Today I built ...

Post by cmorley » Sun Jul 14, 2019 3:19 pm

Voltage regulator on... no it is not the 3 pin device that is a diode - look closer!
Photo0595.jpg
27C400/27C800 EPROM/ROM emulator

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Re: Today I built ...

Post by cmorley » Sun Jul 14, 2019 5:14 pm

And assembled... not fully cleaned though. I need to attach some wires to this one for the STM32 ARM processor debug port to develop the software.
Photo0601.jpg
Photo0602.jpg

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marcusjambler
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Re: Today I built ...

Post by marcusjambler » Mon Jul 15, 2019 10:57 am

Oooh... Whats this one chris?

cmorley
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Re: Today I built ...

Post by cmorley » Mon Jul 15, 2019 11:39 am

marcusjambler wrote:
Mon Jul 15, 2019 10:57 am
Oooh... Whats this one chris?
It is a prototype for an 27C400/27C800 EPROM emulator. I have a big dev board running fine already.

It has a big FLASH so 4x 27C400 images can be loaded and switched between. Program via USB. 27C400 is 16 bit but I support the _BYTE pin for true 8 bit operation. Then with an adapter it could be used in any 8-bit machine e.g. Master MOS ROM

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Re: Today I built ...

Post by awilliams » Mon Aug 12, 2019 6:23 am

bprosman wrote:
Sat Dec 01, 2018 6:06 pm
Today I built a Godil adapter.
Very nice, I have just ordered the 50pin gdil device and was wondering if you have spares of the adaptor or if the gerbers or other files were available.
I have a defective Filestore E01 & hope to shed some light on why.

Alan

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flaxcottage
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Re: Today I built ...

Post by flaxcottage » Sun Sep 29, 2019 1:27 pm

Here is one for the real valve enthusiasts ...

Over the past 40 years or so I have been collecting all sorts of electronics junk from the 'valve era'. The aim was to have something to do during my retirement (He says, not having a day free nowadays - ha ha!)

One of my projects I had put on hold was to build the regulated variable power supply I saw in the December 1967 edition of Practical Wireless, a magazine I used to get every month BITD. The edition can be found here:- https://www.americanradiohistory.com/Ar ... 967-12.pdf

Taking a break from archiving stuff I spent a week or two building it.
PSU front.jpg
This is the front panel of the completed unit and before I fit labels.
.
Underside wiring.jpg
This is the underside wiring. There are very few components compared to today's PCBs. That is one reason I like valves - macro-electronics that I can actually see without a microscope. :lol:
.
Top view oblique.jpg
Then there is the top view showing the 12E1 regulator valve, the EF80 DC amplifier and the 85A2 voltage stabiliser almost hidden behind the black mains transformer in the foreground. In the background are two 16mfd oil-filled paper capacitors and a 10H smoothing choke.

Hidden behind the mains transformer is the rectifier valve, an EZ81. The mains transformer delivers 350-0-350v at 150 mA to produce 480v unregulated. The regulated output is 170 - 320v at 150mA. There is also a 6.3v at 5A supply for valve heaters.

Everything was available from my 'junk box' except the two meters, which I obtained from a great eBay seller, the 5W ceramic wirewound resistors (white blocks in the photograph of the underside), the 0.1MFD 630v capacitors and the chassis, which was a 12"x12" adaptable galvanised box again from eBay.

The colour scheme of orange and white harks back to my days working for the Orange, which had a works in my village. Orange is still in business today and still making equipment for the pop industry.

Why bother making this? That is the current Mrs Flaxcottage's question. I recently bought a copy of the excellent book by O S Puckle - 'Timebases and Scanning Generators' and would like to experiment making some of the circuits, hence the need for a valve power supply. I may even get as far as building a valve-based adder and, who knows, maybe there will be a valve-based 6502 in the not too distant future. :lol: :^o
Last edited by flaxcottage on Sun Sep 29, 2019 1:35 pm, edited 1 time in total.
- John

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