Wiki editing discussion

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By Manuel

Ascended (18088)

Manuel's picture

23-02-2021, 22:35

OK, so I learned the following things:
1. the diagram connects address line 15 (A15) to the M60002-0125SP ASC2 MegaROM controller chip. But that doesn't tell anything. Who knows what this chip does exactly with the A15?
2. However, if that A15 was NOT connected, there would DEFINITELY be the mirroring. Now, we don't know for sure. Still, why would they connect A15 if it wasn't useful? gdx, did you connect A15?
3. The games I tested apparently use the LZ93A13 (ASC1) MegaROM controller chip. But what is the difference in behaviour?
4. Apparently, in openMSX, we do NOT emulate mirroring for the ESE-RAM. But also, in openMSX, the mapper for ESE-RAM is an ASCII8 type. And gdx said he used Garakuta, which is an ASCII16 mapper and uses the LZ93A13 chip. but that 8 vs 16 may not be relevant, as these chips seem to be configurable on the PCB.
5. On the Zoids PCB, A15 is connected to a pin of the LZA chip and it shows no mirroring.
6. I also checked the Jansei PCB. That's a M60002 chip. The PCB has pin 18 of the MSX cartridge connector (A15) connected to a pin of the mapper chip. After dumping, I saw it has no mirroring.

I think the last two points strongly suggest these two mapper chips have a function to avoid the mirroring, as they do something with A15 and indeed show no mirroring. What else would the point of connecting them be?

Can you send me the ROM file of that collection that fails in openMSX's ESE SCC but works on real ESE SCC? And tell me how you load it on real ESE-SCC?

By gdx

Enlighted (4634)

gdx's picture

24-02-2021, 01:51

Manuel wrote:

did you connect A15?

I connected wires as indicated.

Manuel wrote:

They are playable if you emulate ESE-RAM....

Konami's Rom cartridges also have these mirrors so it should work without selecting ESE-RAM.

Manuel wrote:

Can you send me the ROM file of that collection that fails in openMSX's ESE SCC but works on real ESE SCC?

Tell me when you have downloaded it. I'll give you the pass later.

https://mon-partage.fr/f/cHKK7mG7/

By Manuel

Ascended (18088)

Manuel's picture

24-02-2021, 13:55

I got it, but why the trouble with the password?

By gdx

Enlighted (4634)

gdx's picture

24-02-2021, 14:52

The password is "manuel"

By Manuel

Ascended (18088)

Manuel's picture

28-02-2021, 00:13

So, indeed, these two games as hacked into that compilation ROM require the mirroring (the original games also rely on it, it seems), as if A15 is not connected. So, your specific ESE RAM has that mirroring, apparently.

By Manuel

Ascended (18088)

Manuel's picture

28-02-2021, 00:14

What is the source of the claim that the Sanyo PHC-77 has a memory mapper of 64kB?

By gdx

Enlighted (4634)

gdx's picture

01-03-2021, 12:41

Does anyone have a picture of the LPE-FLASHG-V2?
https://www.msx.org/wiki/Padial_LPE-FLASHG-V2

By sd_snatcher

Prophet (3454)

sd_snatcher's picture

02-03-2021, 00:41

The Sony AC-HB3 wiki article has the following statement:

"While this adapter may seem similar to the Sony AC-HB1 series, or the Sony AC-HB2P, the connector and output voltages are NOT the same, and they cannot be used as substitutes"

But this is not true. The three power supplies and the respective machines internal voltage regulator circuit are compatible, except for minor details like:

  • The connector size of the MSX2 machines is smaller than the MSX1 machines
  • The MSX1 power supply is a bit weaker (current) than the MSX2 power supply

My Panasonic FS-A1 came without its power supply. Until I was able get an MSX2 power supply, I used it with either the AC-HB1 or the AC-HB2P without any problems. I had a cable with the mini-IEC connector and inserted its wires into the respective pins of the power supply connector.

OTOH, the important information that the Mitsubishi ML-TS2(H) power supply, that has the same mini-IEC connector, is incompatible is missing on the article.

By gdx

Enlighted (4634)

gdx's picture

02-03-2021, 10:45

The wiki articles are true. These power supply are a little different.

Outputs are written on the cases.
FS-AA51: AC 18V 170mA, DC 9V 1200mA
AC-HB1: AC 16V 160mA, DC 6V, 900mA
AC-HB2: AC 16V 160mA , DC 6V 900mA
AC-HB3: AC 18V 170mA , DC 9V 1200mA

When you power a device that consumes more with the same power supply, the voltage drops more.
For example if you power the FS-A1 with the AC-HB1 or AC-HB2 the voltages will drop under 16V/6V. It will probably work and even with one or two cartridges inserted that do not consume too much but the current will be less stable. I do not recommend doing this over the long term, and especially since it's hardware pretty old.

About the Mitsubishi ML-TS2, I have not checked if the connector is compatible or not but the voltages are not compatible. Do not connect another MSX to this power supply!

By gdx

Enlighted (4634)

gdx's picture

02-03-2021, 15:23

Why did you put the pictures of the cartridge MSX-Write on the wiki page since it is integrated in the Sanyo PHC-77?
MSX-Write is on the printer board. I think the slot 2 is extended at least into tow secondary slots for the printer interface and MSX-Write. This is certainly the reason for which MSX-Write is not in the slot 3-2.

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