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HowTo: Fast EPP mode 1024 Controller
( virgil skinner)
Step 5 : Output register(s) back end
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| | The output register back end section consists of an 8x8 array of registers (74LS573), and bus buffer chips (2- 74LS245), 2 - 8 position DIP switches for board selection, along with misc inverters (2 - 74LS04) for register latch enable functions. Input to the card is from a daisy chain 40 pin IDE ribbon cable header. Output to the end circuit is via 10 pin IDE ribbon headers. A maximum of 16 Output cards can be chained together to get 16x8x8 or 1024 ports of control. The register chips will directly drive the ULN2803 relay driver chip described in another "How To" on this site. It should also be able to drive the SSRs detailed on this site, but may require addition of a 4.7K pull up resistor to the register output pins, depending on the SSR design.
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