precaud wrote on 2019-09-19, 14:49:Yesterday I found one of these 8-bit ISA cards (Rev B) in my pile of old pcbs. It's missing two things:
: The bios chip (that is […]
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Yesterday I found one of these 8-bit ISA cards (Rev B) in my pile of old pcbs. It's missing two things:
: The bios chip (that is easily fixed; the image is on Minuszerodegrees website). The EPROM was probably removed by me many years ago before I knew what the card was.
: Crystal X2 in the upper left corner. What frequency is it?
I found a couple pics of this board on the web, but they're not high-res enough to be able to read the printing on this crystal. X1 just below it is 4.8MHz.
Does anyone know what frequency this xtal is?
Thx for any help.
lcs-fdc.jpg
I have a card that looks _very much_ like this one. On mine, that crystal is 8.3333 MHz. BTW, I stumbled on this thread because I need to know jumper settings for my similar card. They're not all identical, but mostly the same (my card is JE-1043). Specifically, mine has your card's JP1, JP2, JP3, and JP5. and JP4 but with 4 positions. My card also has another jumper below the 4.800 MHz crystal, between the 7348N and the 7406P (fwiw, that jumper has 3 pins, and has 2-3 jumped). Also, I have a ROM in the ROM slot (version E6610 C2).