Laser Galvo - fast enought?

dub 19, 19:37

Galvos for my laser Vectrex should make 20kps.
First question what this value mean. If it is number of positions (increments) per second than we can do very easy calculation:

50Hz is average refres rate of vectors
than for one frame we have 20000/50= 400positions for one fram.

if we know that resolution from vectrex is 256×256 points what can be result.

Galvos are to slow.

also result when galvos was connected to Vectrex show same.
we will probably need galvos 10 times faster or better will be more.

using laser bring also another problem.
we need to switch laser on and off very fast

attached is video with result
Lasers video

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Clonning - Multicart test

dub 19, 14:36

As I allready write in previous post, to play some games we need multicart.
I made one by description from internet, in general it is big EEPROM with switches to select game.
For my design is used AMIC 29040-70F, some resistors for pulldown and dip piano.
Nothing special, but during test doesnot work. At the end, problem was only that my FLASH have different position for WE and VPP than general EPROMS.
One short cable repair this mistake and my first multicart works.

Picture bellow is now from some other game than first screenshot. It is also in XY mode, than we can see that vectrex really works :-)
Unfortunatelly PS2 joysticks did not arrive yet … but at first look it is very nice. (at least for me)

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Clonning - first power up

dub 19, 14:21

25.3.2011

HW is ready, it is in box and ready for start.
First check was with multimeter, if there is no shortcircuit.
Second without rare IC (6809, 6522, AY)
all voltages seems to be OK.
than power up with all IC and oscilloscope on XY.

and

dont work :-(

at first some output is here, but wrong one, it also doesnot make any sound.
May be some problem on Data or Adress bus, measured, but all lines are fine, no short, no open pin.

than what about changes from original?
ROM is connected correctly
RAM also
but with LogicAnalyzer, OE, CE and RW have wrong values!
Once more check of added circuit for CE and I have it, one pin is connected to wrong line.
After 5 minutes and small soldering we have on osci first image :-)

who can recognize which game is on osci?

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Clonning - Joystick

dub 19, 14:10

As you probably know, joysticks are analog with 4 buttons.
I hard lot of stories how bad designed they are. How complicated is repair this device when something is wrong.
But all the time I was thinking why it should be so complicated? Nothing special is inside, two poti, 4 buttons.
With this in my head, I just order two cheapest PS2 joysticks from
DX

We will see what will arrive and what is inside.

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Clonning - Box

dub 18, 22:12

23.3.2011

Boards are soldered, Lasers are here, what is next?
Vectrex need some box.
I decided to use MiniITX box for Vectrex.
MiniITX case is big enought, it is nice, inside is power supply with all necessary voltages (5V, 12V, -12V, 3V3). Also price is very good (about 30 Euros)

Here are pictures:

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Clonning - soldering

dub 18, 21:59

22.3.2011

All parts are here, PCBs have vias. Soldering can start.
It take about 3 hours. But result looks promising :-)


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Lasers - parts arived

dub 18, 21:53

call from DHL and lasers are here.

it is set of 20kps galvos from TE Lighting.
attached is manual for set. Price was about 69$.
Big question is: “will it be fast enought?”

we will see…

PDF with manual for galvos:
20K Scanners.pdf

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Clonning - Multicart

dub 18, 21:47

17.3.2011
one day later

Cartrige is one very important part what we will need for our Clone.
Of course, we are in year 2011 than we will not have only single cart, but we will create multicart, with 32 games :-)
It is based on desing from net (link will be added later)

and board is here:

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Clonning - PCBs

dub 18, 21:38

16.3.2011

PCBs was not easy part, but I allready produce lot of boards by photo method and than it is only question of time.
Problem was only size of board, it is about 230×125mm, double sided. But anyway, 3 days after PCB design was finalized, bare boards are here :-)


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Components

dub 18, 21:12

Until this moment, all cloning was only computer work. But for real HW, we need parts. When you look at part list in Vectrex service manul you see some key parts:

  1. CPU 68A09
  2. PIA 6522
  3. AY-3-8912

All of them are not any more produced, than we have to search.
Maybe I have lot of luck, but
2 CPUs was for 7$ at Ebay
3 6522s for 6.5Euro also at Ebay
AY was from Noby (producer of DivIDE)

Than I am sure, all parts are available, lets make board :-)

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