Talent DPC-200 Power Supply Failure

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Van Jipe

Paragon (1559)

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05-03-2018, 20:17

I see a memory that is not original on the motherboard on the location IC16 is a TMM4164AP15, what the reference of other memories?

Van tsMKG

Resident (48)

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06-03-2018, 02:36

I don't know to be honest, and searching the datasheet for each part is indeed a very complicated task. I get confused most of the times because I don't even know what each of the ICs are even supposed to be oO They don't have MSX-like names but instead they have such weird names.

Van tsMKG

Resident (48)

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06-03-2018, 14:50

One stupid question though: Does the "MSX system version 1.0 Copyright 1983 by Microsoft" screen show even when there's no RAM and a game cartridge is inserted? Question

Van Jipe

Paragon (1559)

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06-03-2018, 15:19

if no ram inside the MSX -> no boot

Van tsMKG

Resident (48)

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06-03-2018, 15:31

Oh, ok, be making a RAM cartridge then Tongue

actually, is there any extra specs that it should be needed to make the RAM cartridge if I don't find that exact RAM IC?

  • SRAM
  • 32K*8
  • 5 V operating voltage

Van tsMKG

Resident (48)

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06-03-2018, 18:11

I mean, is there any special specifications when it comes to buying RAMs?

Because I'll try to get one locally. What I know it's the operating temperature, the operating voltage, that its should be static and that it should be 32K * 8 bits. Is the access time too important too?

EDIT: Looks like someone's selling a 62256 on MercadoLibre, judging by the links you showed me, that one works for the RAM CART.

Van Jipe

Paragon (1559)

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06-03-2018, 19:05

work with 70ns memory , if faster i don't know !

Van tsMKG

Resident (48)

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06-03-2018, 21:34

Eh, is the transistor NPN or PNP? Just asking because everything on the diagram is in French but didn't have problems until i got to the transistor.

(Edit: looking at it's data sheet, it doesn't look like a CBE transistor, I'm confused Question )

Van tsMKG

Resident (48)

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07-03-2018, 01:40

Eh, to not be rude, but in the 62256 (one of the alternatives you posted) has a different pinout than the 43256, should I adapt my circuit to use with 62256?

EDIT: My mistake, I was reading the outer side of the IC, not the inner. Weird way to connect the SRAM memory tho Tongue
I've ordered two of these and they're coming in a few days (between the 9th march and the 13th approximately).

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