Subject: Re: [stella] Cartridge PCBs have arrived From: "Andrew Davie" <adavie@xxxxxxxxxxxxx> Date: Tue, 8 May 2001 16:54:46 +1000 |
The boards are great, Joe ... but does anyone know where to source blank plastic cart cases? Cheers A -- _ _ _| _ _ _| _ * _ _ , (_|| )(_|( (/_\/\/ (_|(_|\/(_(/_ ,~' L_|\ ,-' \ see my Museum of Soviet Calculators at ( \ http://www.taswegian.com/MOSCOW/soviet.html \ __ / Qb: the latest retro video game! L,~' "\__/ http://www.atari2600.org/qb.html @--> v ----- 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 > > - > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ > Unsub & more at http://www.biglist.com/lists/stella/ > - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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