Re: Asteroids display problem

Has anyone tried this site? http://www.broker1.tv/index1.html?all

It seems like you can find just about anything here, but you'd probably
need to be willing to buy in bulk.

Matt

Phil Morris wrote:

> At 22:57 15/06/2002 -0500, you wrote:
>
>> I guess it's time to start rooting out an inexpensive replacement. Wish
>> me luck.
>
>
> No-one has yet mentioned the alternative to the AD561J - the AM3012
> (or modern day equivalent, the DAC312HP). Much cheaper than the AD561J
> and readily available.
>
> However, it's not exactly a drop in replacement - there is provision
> for it on the board (look at the the existing AD561J DACs and you'll
> see two unoccupied pads). You'll need to therefore add a suitable
> socket (or solder the DAC directly to the board if you wish) BUT
> you'll also need to add the support components, ie caps and resistors.
> It WON'T work unless these are added. I know, I've tried.
>
> This is a lot easier on rev 5 boards and later (as mentioned, I've
> done it and it works just fine) but on earlier boards (such as rev 2)
> the locations of the AM3012 support components aren't marked on the
> board, plus there is one resistor pad missing (easy enough to attach
> the resistor though).
>
> The Asteroids Deluxe schematics will provide you with the relevant cap
> and resistor values, but as I've done the mod myself I decided to note
> them down, as follows:
>
> Asteroids Rev 05 board:
>
> AM3012/DAC312 at D12:
>
> R148 = 10K +/- 5% 1/4W Resistor
> R149 = 10K +/- 5% 1/4W Resistor
> R150 = 4.7K +/- 5% 1/4W Resistor
> R151 = 10K +/- 5% 1/4W Resistor
> R152 = 8.2K +/- 5% 1/4W Resistor
> C124 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C125 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C126 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C127 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C128 = .1uf Ceramic Disc 25v Radial Lead Capacitor
>
>
>
> AM3012/DAC312 at B12:
>
> R153 = 10K +/- 5% 1/4W Resistor
> R154 = 10K +/- 5% 1/4W Resistor
> R155 = 4.7K +/- 5% 1/4W Resistor
> R156 = 10K +/- 5% 1/4W Resistor
> R157 = 8.2K +/- 5% 1/4W Resistor
> R158 = 2.2K +/- 5% 1/4W Resistor
> C129 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C130 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C131 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C132 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C133 = .1uf Ceramic Disc 25v Radial Lead Capacitor
>
>
> Early revisions of Asteroids boards (for example, Rev 2) that have no
> location markings for these extra components yet that do have the
> ready-made yet
> solder filled holes:
>
> Same as for Rev 05, BUT the location R158 is missing from the board -
> to fit R158,
> attach one lead to the left hole of R157 and the other lead to the
> metal ground that
> is so prevalent in this area
>
>
> Asteroids Deluxe Rev 01 board:
>
> AM3012/DAC312 at C/D11:
>
> R81 = 10K +/- 5% 1/4W Resistor
> R82 = 10K +/- 5% 1/4W Resistor
> R89 = 4.7K +/- 5% 1/4W Resistor
> R90 = 10K +/- 5% 1/4W Resistor
> R119 = 8.2K +/- 5% 1/4W Resistor
> C52 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C53 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C80 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C90 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C91 = .1uf Ceramic Disc 25v Radial Lead Capacitor
>
>
> AM3012/DAC312 at A/B11:
>
> R83 = 10K +/- 5% 1/4W Resistor
> R84 = 10K +/- 5% 1/4W Resistor
> R91 = 4.7K +/- 5% 1/4W Resistor
> R92 = 10K +/- 5% 1/4W Resistor
> R124 = 8.2K +/- 5% 1/4W Resistor
> R125 = 2.2K +/- 5% 1/4W Resistor
> C54 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C56 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C82 = .1uf Ceramic Disc 25V Radial Lead Capacitor
> C90 = .1uf Ceramic Disc 25v Radial Lead Capacitor
> C97 = .1uf Ceramic Disc 25v Radial Lead Capacitor
>
>
>
> Hope that helps someone,
> Phil
>
>
>
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Received on Sun Jun 16 12:38:48 2002