Problemas de incompatibilidad

By Alhazred

Master (195)

Alhazred's picture

16-07-2016, 12:19

Buenos días.

Hay alguna diferencia entre los modelos de son y HB 10P Y HB 20P? Lo digo porque en el primer modelo tengo problemas para cada cargar unas cintas que en el segundo van perfectamente. Usando el mismo casete. No puede ser coincidencia.
Un saludo.

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By gdx

Enlighted (6071)

gdx's picture

16-07-2016, 12:59

A PCB has been added into the HB-20P. Maybe it fixes a design problem.

http://www.msx.org/wiki/Sony_HB-10P
http://www.msx.org/wiki/Sony_HB-20P

By sd_snatcher

Prophet (3642)

sd_snatcher's picture

16-07-2016, 13:57

From the HB-10P Wiki:

"Sony HB-10P and some an early versions of the Sony HB-20P do have also a quirk on A8h port that makes RAM in page 3 appear both in slot 3 and in slot 0. This mirroring effect is emulated in openmsx for the Sony HB-10P, as it can be very annoying as it can play havoc with games that needs 32K of RAM and set page 2 assuming that the ram is in the same slot of page 3."

Quote:

A PCB has been added into the HB-20P. Maybe it fixes a design problem.

This board is related to the VDP and won't change anything related to the weird slot layout that causes poorly coded games to crash.

BTW, my HB-20P has no such daughterboards inside and works perfectly with those games.

That daughterboard seems to be just a VRAM adapter. The motherboard originally uses 4116 DRAM chips and that board uses either PSRAM or SRAM. Probably Sony couldn't buy a batch of correct DRAMs and had to create this adapter.

Too sad the resolution of the picture is too low, so we can't know for sure if those are PSRAMs or SRAMs.

By gdx

Enlighted (6071)

gdx's picture

16-07-2016, 16:30

The HB-10P service manual says the 64KB of ROM is all in slot 3.

http://msx.hansotten.com/uploads/msxdocs/sonyhb10p10bsm.pdf

By mars2000you

Enlighted (6428)

mars2000you's picture

16-07-2016, 17:04

gdx wrote:

The HB-10P service manual says the 64KB of ROM is all in slot 3.

http://msx.hansotten.com/uploads/msxdocs/sonyhb10p10bsm.pdf

I guess there is some confusion with the mirror effect. Same remark for HB-20P that has also all the RAM in slot 3 (mirror effect only on the first version of HB-20P). Physically, the RAM is in slot 3 but due to an error design, the RAM is mirrored in slot 0. The mirror does not correspond to the real location of the RAM.

By gdx

Enlighted (6071)

gdx's picture

17-07-2016, 08:07

Thank you mars2000you, I understand better now.