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Stefan Berndtsson
Works at Göteborgs universitetsbibliotek
Lives in Gothenburg, Sweden
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Då var det dags igen. Västtrafik kämpar hårt för att bil ska löna sig i längden. De är väl inte där riktigt än, men några år till så...

#västtrafik   #västtragik  
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4 januari höjer Västtrafik biljettpriserna med i snitt fem procent. Men årskortet för Göteborg blir tolv procent dyrare.
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Robert Krenn's profile photoChrister Gustavsson's profile photoStefan Berndtsson's profile photo
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Det är min förbannade rättighet att gnälla! :)
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Med 62 av 297 distrikt räknade ligger folkomröstningen om trängselskatten i Göteborg nu på 57% nej.

Lite överraskande, men det finns ju fortfarande utrymme för helomvändning, så man ska väl inte ropa hej än.
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Då var röstningen klar då. Både +Piratpartiet och +Öppna Göteborg, samt ett Nej. 
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Hampus Bengtsson's profile photoStefan Berndtsson's profile photoAndreas Pettersson's profile photoÖppna Göteborg's profile photo
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+Andreas Pettersson Jag känner igen det alldeles för väl. Tragiskt är vad det är.
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+Handcent SMS seem to have completely lost it in their latest update (no, I don't want to create an account to get rid of a notification dot).

So what are some sensible SMS app for Android? I can't stand the Hangout app, hence the choice of Handcent. I also only care about SMS, not MMS or any IM stuff.

I don't mind paying if it's reasonable and the app is good.
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As it happens, I installed Chomp about an hour ago. :)
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The Amiga CD32 is another first for me. I have a CDTV, but I haven't had a CD32 until now. :)
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A while since the last Z80 post now.

Current progress is that there are now schematics for the five main parts of the thing.

http://pub.nocrew.org/z80/cpu.pdf
http://pub.nocrew.org/z80/memory64k.pdf
http://pub.nocrew.org/z80/arduino.pdf
http://pub.nocrew.org/z80/audio.pdf
http://pub.nocrew.org/z80/video.pdf

Everything here is done using KiCAD. Preliminary PCB layouts have also been made. The images provided are the 3D renderings KiCAD gives from the layouts.

#Z80   #Arduino  
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harri manni's profile photoJörgen Overgaard's profile photoStefan Berndtsson's profile photo
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It's slower since vacation ended, but I'm currently rebuilding from the schematics to catch any obvious errors there (found some already).

I've rebuilt 3 of the 5 modules (cpu, ram, arduino) and powered them up to check for shorts between GND and Vcc.

I've also moved from an Arduino Nano to a barebones ATmega32a (will probably use a 1284 later) so code needs to be adjusted as well :) 
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Chinese quality at its best. This is from a cheap Qi Wireless Charger off Ebay (http://www.ebay.co.uk/itm/251595503550).

Yes, the screw is connected to GND, and yes, the via is connected to VCC, and yes, they do overlap. They're not actually in contact, but it seems they're relying on the solder mask being thick enough to keep them separate. 

It works well enough, and I guess you get what you pay for, but...

I've removed that screw now. :)
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Tomas Skäre's profile photoStefan Berndtsson's profile photoDominique Morice's profile photo
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No, I was modifying one of them to reduce LED brightness and found that. 
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Grattis rasister.
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After far too long, the next phase of pre-PCB testing is being initiated.

Here are three modules (from left, 64kB RAM, Z80 CPU and Arduino/AVR). Audio and Video are not yet rebuilt for this phase. RAM, CPU and Arduino/AVR are the critical components to get it running at all.

These boards are built from the schematics ( I hope :)), and any changes here will be implemented in KiCAD right away. So when this works, the PCB's based on it should be reasonably safe to order.

The Arduino/AVR bit has moved from an Arduino Nano to a plain ATmega32A. This gives me more pins, but more importantly, it's pin compatible with the ATmega1284P, which will most likely be the one used in the end.

This means it won't have an Arduino bootloader, but will be flashed via an USB-ASP (partly visible on the right side) directly. For maximum library compatibility, the actual code will still remain mostly Arduino-based though. An FTDI will be added to this setup as well for serial communication. So some code needs to be rewritten and adjusted for new pin configurations and such, but that shouldn't be too much of an issue.

The boards are connected via the 50pin ribbon cable in the back. This is just an old internal Narrow-SCSI cable I had in a drawer. I don't intend to run fast enough for the extra length to disrupt much at this point. The final PCB's will use the same way to connect, but that will be using a cable of more optimal length.

The setup got slightly less messy with the bus connecting the boards :)

#Arduino #AVR #Z80  
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There will be caps too. Yes, it's a real problem with the breadboards. I just haven't got around to it yet. Work, and other stuff. Any day now :)
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Got my first PCB's from OSHpark today. A very simple breadboard adapter for a 50pin IDC connector with the IDC-connector offset enough to be mostly outside the breadboard area.

So with this, I can build the separate Z80 computer modules (CPU, RAM, Audio, Video and Arduino) and have a traditional internal SCSI-cable feeding each module with the appropriate pins, without the ribbon cable covering everything for me.

It's all untested still, but hopefully it'll work. :)

This board has since been cleaned up a bit and is shared on OSHpark at https://oshpark.com/shared_projects/h6FlzF7R

#Z80 #Arduino  
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Neat idea!
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Got myself a new laptop. My first Z88, and it's working too.

The eagle eyed folks will note a stack of Atari 2600 games to the left, an Amiga 1200 to the right, and a Sony HitBit F1XV MSX2+ behind the Z88-case.
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Robert Krenn's profile photoKristian Lundegård's profile photoStefan Berndtsson's profile photo
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+Kristian Lundegård Vet inte riktigt vad jag har (och det beror ju lite på vad du tänkt koppla in den till också), men annars finns det säkert på Ebay.
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Då var 7 veckor semester förbi då. Ovant att åka till jobbet :) 
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harri manni's profile photoRobert Högberg's profile photoChrister Gustavsson's profile photoStefan Berndtsson's profile photo
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Kylan fungerade i a f väldigt bra på vår våning på jobbet. Första sommartestet för min del (vi flyttade ju dit i slutet av förra sommaren).
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