74LSN from Signetics High Technology, Inc.. Find the PDF Datasheet, Specifications and Distributor Information. Ordering information. 74HC; 74HCT Dual 2-to-4 line decoder/ demultiplexer. Rev. 4 — 11 December Product data sheet. Table 1. Ordering. These Schottky-clamped circuits are designed to be used in high-performance memory-decoding or data-routing appli- cations requiring very short propagation .

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IC1 30p C1 0.

NTE74LS – IC-TTL Dual 2-To-4 Decoder

Parts added in update: As is, the design is a hybrid of the famicom and Datashret. SOT23 aka TO eagle part substitute: Both console and cartridge chips I need datashete go back and change the package size used in CIC clk circuit. I’m numbering the passive components as I add them to my schematic, for now disregarding the numbering system obtained from the 74ls13n schematics see my research post. Nintendo’s custom pin expansion header has been replaced with a 50 pin ribbon cable connector.

That being said once the hybrid schematic is complete I’ll probably start playing with the board layout of my clone first, and shelve the reference schematic forks for later. Each controller port is connected to two of the arrays. P6 av out P7 usb power port P8 60 pin famicom cartridge connector P9 famicom expansion port P10 mic in?

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About Us Contact Hackaday. Regarding the CIC lockout chip. They protect the CPU and hex inverters from damage while plugging in controllers.


So really I’ve building a clone motherboard that requires 4 of the original chips: It was intended to be a DRM mechanism, but it also ended up being a mechanism that wouldn’t allow you to play games with possibly bad cartridge connections.

I beleive I have found a replacement part datashet combines both array types into a single package. Questionable assignments on a few pins though, would like review some more.

The following pins are not connected to anything: Completed netting of all pins attached to IC’s U1 – U Resistors RM1 10K 11x 12x? Datahseet I’d like to create forks of the schematic, one faithful to the famicom, one faithful to the NES, and various other ones integrating mods.

Currently the CIC host reset line is wired to expansion pin CIC chip optional All of the other parts I find equivalents for, with the criteria that mouser. Both console and cartridge chips. I’d like to turn it into a mechanism that merely indicates a connection issue, one that still allows you to play despite the warning.


National Semiconductor

I had considered omitting the CIC completely but I think it could be re-purposed. I need to go back and change the package size used in CIC clk circuit. Motherboard schematic for the original Nintendo Entertainment System.

So we only need one array per controller port now. In this scenario the CIC, which is wired to the physical reset switch, will still reset the CPU when it senses that the reset button is pushed. Need to check if the NPN transistor I used in the schematic is a valid substitute for what Nintendo used.