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HCU04: Difference between revisions
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* '''U9A''' outputs CIC3 to the [[Cartridge Slot]] | * '''U9A''' outputs CIC3 to the [[Cartridge Slot]] | ||
* '''U9B''' outputs CL1 to the [[CIC]] | * '''U9B''' outputs CL1 to the [[Checking Integrated Circuit|CIC]] | ||
The next two inverters help generate [[XIN]]: | The next two inverters help generate [[XIN]]: | ||
Latest revision as of 11:06, 20 December 2023
U9A and U9B in region D2 of the jwdonal schematic
The HCU04 is a hex inverter. The first two inverters take SCLK from pin 41 of S-DSP as input:
- U9A outputs CIC3 to the Cartridge Slot
- U9B outputs CL1 to the CIC
The next two inverters help generate XIN:
- U9C appears to undo the inversion that U9C did, and sends the output to R5, which eventually becomes XIN after passing by the pull-down R4
- U9D is in parallel with R6, receiving its input from C4 and outputting to U9C
The last two inverters take ground as input and their outputs are not connected:
- U9E
- U9F