User:Persune: Difference between revisions
From NESdev Wiki
Jump to navigationJump to search
(Update) |
(Famicom EPSM access) |
||
| Line 22: | Line 22: | ||
- TODO: RF Famicom HVC-CPU-07, RF Famicom HVC-GPN rev, AV Famicom HVCN-CPU rev, Sharp Twin Famicom rev | - TODO: RF Famicom HVC-CPU-07, RF Famicom HVC-GPN rev, AV Famicom HVCN-CPU rev, Sharp Twin Famicom rev | ||
</nowiki> | </nowiki> | ||
Some bits i'm drafting: | |||
==Famicom EPSM access== | |||
Due to the lack of EXP pins on the Famicom's cartridge pinout, an equivalent version does not have direct access to any of the methods above. | |||
For the universal $4016 access, one may directly connect OUT1 from pin 11 of the Famicom's expansion port to the EPSM, or replicate OUT1 by latching $4016.D1 writes with external circuitry. | |||
For the memory mapped access, a 2x15 pin header may be provided with the signals required for use with an external daughterboard. | |||
Daughterboard | EPSM | Daughterboard | |||
+-------\ | |||
GND -- |01 30| -- +5V | |||
CPU A11 <- |02 29| -> M2 | |||
CPU A10 <- |03 28| -> CPU A12 | |||
CPU A9 <- |04 27| -> CPU A13 | |||
CPU A8 <- |05 26| -> CPU A14 | |||
CPU A7 <- |06 25| -- NC | |||
CPU A6 <- |07 24| <- YMF288 A1 | |||
CPU A5 <- |08 23| <- YMF288 A0 | |||
CPU A4 <- |09 22| <- EPSM CE1 | |||
CPU A3 <- |10 21| <- EPSM /CE2 | |||
CPU A2 <- |11 20| <- EPSM /CE3 | |||
CPU A1 <- |12 19| -- NC | |||
CPU A0 <- |13 18| -- NC | |||
CPU R/W <- |14 17| -> /ROMSEL | |||
NC -- |15 16| -- NC | |||
+-------/ | |||
Revision as of 17:44, 23 April 2023
Hello! I usually write music, or work on hardware/software projects for the Famicom. From time to time, I like to investigate certain aspects of the Famicom, be it audio, video, or otherwise.
TODO:
- learn wiki markup
- write and publish personal research here:
- Famicom cartridge PCB measurements, dimensions and footprints
https://www.nesdev.org/wiki/Famicom_cartridge_dimensions
Completed so far:
- FC HVC-TGROM-01
- FC HVC-CNROM-256K-01
- TODO: publish HVC-ETROM-01 measurements
- NES cartridge PCB measurements, dimensions and footprints
https://www.nesdev.org/wiki/NES_cartridge_dimensions
Completed so far:
- NES-EWROM-01
- TODO: measure unlicensed cartridge PCBs
- NES/Famicom equivalent opamp amplifier gain
- TODO: RF Famicom HVC-CPU-07, RF Famicom HVC-GPN rev, AV Famicom HVCN-CPU rev, Sharp Twin Famicom rev
Some bits i'm drafting:
Famicom EPSM access
Due to the lack of EXP pins on the Famicom's cartridge pinout, an equivalent version does not have direct access to any of the methods above.
For the universal $4016 access, one may directly connect OUT1 from pin 11 of the Famicom's expansion port to the EPSM, or replicate OUT1 by latching $4016.D1 writes with external circuitry.
For the memory mapped access, a 2x15 pin header may be provided with the signals required for use with an external daughterboard.
Daughterboard | EPSM | Daughterboard
+-------\
GND -- |01 30| -- +5V
CPU A11 <- |02 29| -> M2
CPU A10 <- |03 28| -> CPU A12
CPU A9 <- |04 27| -> CPU A13
CPU A8 <- |05 26| -> CPU A14
CPU A7 <- |06 25| -- NC
CPU A6 <- |07 24| <- YMF288 A1
CPU A5 <- |08 23| <- YMF288 A0
CPU A4 <- |09 22| <- EPSM CE1
CPU A3 <- |10 21| <- EPSM /CE2
CPU A2 <- |11 20| <- EPSM /CE3
CPU A1 <- |12 19| -- NC
CPU A0 <- |13 18| -- NC
CPU R/W <- |14 17| -> /ROMSEL
NC -- |15 16| -- NC
+-------/
