Scandoubler recommendations

[EzdineG]

Don't forget the 3m velcro strips.  I've assembled many a 1200 with these retaining newer 44pin hd's.  Newer, smaller drives don't usually line up with the hd-bracket screw holes.

[srg86]

http://www.amiga.org/gallery/images/1043/small/1_1291.jpg

Surly there's a better place to put it than under the hard drive, is that the only place for those hot chips??

srg

[adolescent]

@srg

It has to go there.  It attaches to the Alice and Lisa chips.

[srg86]

But couldn't the main PCB be moved a bit firther to the right, out of the way of the hard drive? The wires look like they'll reach.

srg

[patrik]

@all:

Has'nt anyone noticed that the internal DCE flickerfixers and the CV64/3D scandoubler uses just 4-bits per colour on the green and blue channel and only the red channel uses 8-bits? Try colouring a large portion of the screen (using ntsc or pal ofcourse) in a aga-aware paint-package as Brilliance or DPaint5, select that colour in the palette-editor and play around some with the red, green and blue sliders...


/Patrik

[Karlos]

@Patrik

So it's really only any use with pre AGA screenmodes? :lol:

If you (for whatever insane reason) absolutely had to use a 4/4/8 format, surely you'd choose 8 bits for green?

RGB 8:4:4? What a pointless design!

[adolescent]

@srg

No.  On the bottom of the pcb is a socket that attaches to the chip.  You can not move it.  

[srg86]

IC, does the RF shielding need removal or modification (is that shield really needed?) and does the hard drive fit neatly over it.

Also, any way of cooling it if necessary?

thanks
srg

P.S I just don't like the idea of ruining the machine (if the thing gets too hot), call it nerves. :-(

[Jiffy]

I also have an internal DCE scandoubler/flickerfixer in my 1200, complete with a 4 GB 2.5" harddisk. It's a bit of a hack to fit the harddrive as the normal cradle does not fit anymore after you place the flickerfixer: the legs are to short and holes of the cradle don't match the harddisk's either. On top of that, I had to remove the upper shielding. Apart from that, the whole setup functions reliably and doesn't suffer from overheating.

The image is very crisp on my 15" Compaq screen, taking in mind that is 'only' a 50 Hz signal ofcourse. I haven't noticed any side effects from removing the shielding of my A1200.

BTW, although it has been mentioned before in this thread: it is _not_ possible to fit the scandoubler somewhere else in your 1200 as it has to be placed directly on top of Alice.

All in all, I am very satisfied with the unit. The flickerfixer itself easily snaps in, replacing the harddrive is not hard either (I am _not_ a hardwarehacker), cutting, slicing and soldering is not necessary and you only have to remove the shielding.

[srg86]

Jiffy wrote:
I also have an internal DCE scandoubler/flickerfixer in my 1200, complete with a 4 GB 2.5" harddisk. It's a bit of a hack to fit the harddrive as the normal cradle does not fit anymore after you place the flickerfixer: the legs are to short and holes of the cradle don't match the harddisk's either. On top of that, I had to remove the upper shielding. Apart from that, the whole setup functions reliably and doesn't suffer from overheating.

The image is very crisp on my 15" Compaq screen, taking in mind that is 'only' a 50 Hz signal ofcourse. I haven't noticed any side effects from removing the shielding of my A1200.

BTW, although it has been mentioned before in this thread: it is _not_ possible to fit the scandoubler somewhere else in your 1200 as it has to be placed directly on top of Alice.

All in all, I am very satisfied with the unit. The flickerfixer itself easily snaps in, replacing the harddrive is not hard either (I am _not_ a hardwarehacker), cutting, slicing and soldering is not necessary and you only have to remove the shielding.

50Hz hmmm.

On my PC, I see flicker at 85Hz refresh rate on plain white. This is enough to cause me eye strain. I run my PC monitor at 100Hz.

I do have one 1989 VGA 14" VGA monitor that afaik is single sync (it has black border arround the outside of the screen so the picture doesn't fill it). at 60Hz I don't see flicker, strange.

Could this cause me problems with scandoubled Amigas on PC monitors.

srg

P.S I don't have this flicker problem in TFT's of course (although I have none of those appart from ny laptop).

[srg86]

Jiffy wrote:
I also have an internal DCE scandoubler/flickerfixer in my 1200, complete with a 4 GB 2.5" harddisk. It's a bit of a hack to fit the harddrive as the normal cradle does not fit anymore after you place the flickerfixer: the legs are to short and holes of the cradle don't match the harddisk's either. On top of that, I had to remove the upper shielding. Apart from that, the whole setup functions reliably and doesn't suffer from overheating.

The image is very crisp on my 15" Compaq screen, taking in mind that is 'only' a 50 Hz signal ofcourse. I haven't noticed any side effects from removing the shielding of my A1200.

BTW, although it has been mentioned before in this thread: it is _not_ possible to fit the scandoubler somewhere else in your 1200 as it has to be placed directly on top of Alice.

All in all, I am very satisfied with the unit. The flickerfixer itself easily snaps in, replacing the harddrive is not hard either (I am _not_ a hardwarehacker), cutting, slicing and soldering is not necessary and you only have to remove the shielding.

Also, those of you with it fitted it in Desktop A1200s, I was wondering where you put the VGA connector. Have you made a hole for it above the other ports, or possibly left it dangling on it's lead outside the case. I was also wondering about that little plate on the left hand side of this image (it would be beneith the floppy drive), would the lead reach to mount the vga connector in that? Looking at A1200 motherboard pics, it would seem that it's unused.

thanks very much
srg

[Doppie1200]

I removed the cap displayed on the far left of your photo.

An old VGA card was sacrificed and I modified the PCI bracket so it would fit nicely.

I can take photo's of it if you like and email them to you.
(or post pictures here if interest exists)

Anyway I got that idea from anouther thread about this which I started. Maybe you can read more about it there.

Avoid cutting up the plastic outer cast. It wil never turn out to be as straight as you imagine it to become when you start

[srg86]

That would be great if possible, I really want to use a scan doubler as I don't want to use blurry TVs or have knackered 1084s or 1438s as it's cluttered with PC monitors as it is.

srg

[Doppie1200]

hehe, I'll take some pictures tomorrow.

BTW, beware that a modern vga is very very very sharp. It makes games look pretty ugly sometimes. That is because some effects relying on the blurry 1084 screen do not work anymore. Looks really like those old 320x200 games on PC used to look.

But I love the 640x512 flickerfree desktop  :-o
Haven't played around with it enough cause my mod is not finished. Harddisk is still not relocated.

[x56h34]

I think it's mainly due to the lack of interlaced screens, that games look bad with flicker fixers.

[Doppie1200]

Hi,

I uploaded three photo's. The mod I'm doing has progressed a little further than is displayed by the photo's. A passive cooler has been glued on the small ic in the lower right corner (used special thermo glue). The tinware has been adapted to fit nicely again and the harddisk bracket has been relocated.

All I need is to drill holes for the harddisk in the harddisk bracket and tinware. Then I'm done.

The photo's do not seem to appear yet. I quess the have to go by the moderators or something.


@x56h34
I think games look bad cause of the incredible dot pitch of modern crt's and the scanlines gone missing :-o
Find a poor quality vga and it all look 1084 again.
I usually take of my glasses.