For what for EPM3128ATC100 on Chinese SNES repro?
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1. NO BLATANT PIRACY. This includes reproducing homebrew less than 10 years old, with the exception of free software.
2. No advertising your reproductions, with the exception of free software.
3. Be nice. See RFC 1855 if you aren't sure what this means.
For what for EPM3128ATC100 on Chinese SNES repro?
Hello everyone,
I would like to know why Chinese SNES reproduction uses this chip?
EPM3128ATC100
Do you think that they are using this chip only like voltage translation" ?
Can it be possible ?
I found this PCB repro on Ali,
Here is the list of components :
- EPM3128ATC100
(what role ?)
- S29GL512 (3v) 512Mbit
(Flash chip for Game)
- AMTRON FM1808-70-SG | Memory; FRAM; parallel; 4.5÷5.5V; 70ns
(Fram chip for storage saves)
- 12F629
(CIC region unlock)
- AMS1117
(Voltage regulator 5v to 3,3v)
I think it’s here only to supply Flash chip S29GL512
- capacitors : 2x 16v 47uf
- one resistor (don’t see valu)
Don’t see any « diodes »
I would like to know why Chinese SNES reproduction uses this chip?
EPM3128ATC100
Do you think that they are using this chip only like voltage translation" ?
Can it be possible ?
I found this PCB repro on Ali,
Here is the list of components :
- EPM3128ATC100
(what role ?)
- S29GL512 (3v) 512Mbit
(Flash chip for Game)
- AMTRON FM1808-70-SG | Memory; FRAM; parallel; 4.5÷5.5V; 70ns
(Fram chip for storage saves)
- 12F629
(CIC region unlock)
- AMS1117
(Voltage regulator 5v to 3,3v)
I think it’s here only to supply Flash chip S29GL512
- capacitors : 2x 16v 47uf
- one resistor (don’t see valu)
Don’t see any « diodes »
Re: For what for EPM3128ATC100 on Chinese SNES repro?
EPM3128ATC100
Its « Complex Programmable Logic Devices » (CPLD).
I think that they using it like Mapper
Its « Complex Programmable Logic Devices » (CPLD).
I think that they using it like Mapper
- krzysiobal
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Re: For what for EPM3128ATC100 on Chinese SNES repro?
Maybe except providing mapping features (the same what 74139 does in HI ROM cart + some other mapping if this is multicart), it also acts as a 5V->3.3V buffer for the ROM chip which is not 5V tolerant? Don't see all the connections.
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Re: For what for EPM3128ATC100 on Chinese SNES repro?
Kind of weird that they'd take the precautions of proper level translation without chamfered edges or hard gold edge connector.
- krzysiobal
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Re: For what for EPM3128ATC100 on Chinese SNES repro?
Hard gold edge connector triples the cost of PCB (at least at jlcpcb.com).poorstudenthobbyist wrote: ↑Sun Apr 11, 2021 12:52 pm Kind of weird that they'd take the precautions of proper level translation without chamfered edges or hard gold edge connector.
They also don't want to make chamfered edges for cheap boards (those at default 10x10cm with enig surface)
Re: For what for EPM3128ATC100 on Chinese SNES repro?
Maybe the PCB is universal for LOROM / HIROM games and this chip is responsible for that (it switches LOROM / HIROM games automatically)
- krzysiobal
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Re: For what for EPM3128ATC100 on Chinese SNES repro?
This memory has 512 Megabits (64 MB), so it must be a multicart (or at least a PCB designed for multicart purposes), it can't be achieved by single 74139.
BTW. This cpld costs 1$, is it really an extravagance?
BTW. This cpld costs 1$, is it really an extravagance?
Re: For what for EPM3128ATC100 on Chinese SNES repro?
Anybody tried to create and program Mappers with those chip ?
Re: For what for EPM3128ATC100 on Chinese SNES repro?
Old chips are not product, like MMC1 3 5 ... vrcX ,so we can not get controller chip
to support large ROM read, use this cpld as a controller to switch address
maybe games has been modified to suit this pcb
cpld can be program as a black box,include many 74chip or other switch module
if use fpga, mmc5, konami vrcX ... can be replaced.
its hardly to us, light a led with a cpld/fpga chip...
program language : VHDL / Verilog
somebody maybe write code for cpld,but for sell ... so... you can see this image of pcb from #1