The boards are great, Joe
... but does anyone know where to source blank plastic cart cases?
Cheers
A
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----- Original Message -----
From: "Chris Wilkson" <ecwilkso@xxxxxxx>
To: <stella@xxxxxxxxxxx>
Sent: Tuesday, May 08, 2001 4:13 PM
Subject: Re: [stella] Cartridge PCBs have arrived
> In message <0e2fft85fpsopjjivminsu35ob8ut2a0j9@xxxxxxx>, Erik Mooney
writes:
> >On Tue, 08 May 2001 00:32:18 -0400, you wrote:
> >
> >>The board uses a 7404 Hex Inverter (14-pin DIP) to invert the
address/chip
> >>select line. I designed the board specifically for use with 4K ROMs. 2K
> >>should also work, but anything larger than 4K (2732s) will not work.
> >
> >I'm no electronics whiz, but I recall someone mentioning that the
inverter
> >for the chip-select line could be done with a single transistor, no need
> >for a (comparatively) bulky and expensive 14-pin DIP chip. Based on my
> >sketchy knowledge, I think that's correct. Anyone? Wilkson?
>
> Yah, you can do this...with a couple of resistors added. Cheaper, but
only
> by a few cents. A 7404 chip only costs 30 cents or so. A transistor is
> maybe 10 cents and a resistor is 1 cent. These are rough figures of
course.
> But the relative costs are about right. In this case, since the pcb is
> designed to fit a standard atari case, there's plenty of extra room for
> the dip. Besides: 100 14 pin dips are easier to install than 100
> transistors and 200 resistors! :)
>
> Of course if you're making 100 boards, that 22 cents comes to 22 dollars!
;)
> Ahh....tradeoffs, tradeoffs....
>
> -Wilkson
>
> -
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