SpritesMind.Net

Posted: **Mon Nov 28, 2011 10:51 am**

Hi,

does someone already mess with the Sega Pico ?

I read with intereset this old post and Notaz doc.

Do you know if a flash card exist for this one ? and what about pal/ntsc jap/us/... ?

I have more and more interest for this one right now....

Posted: **Mon Nov 28, 2011 11:45 am**

The pico is basically a megadrive without the z80,ym2612 and with a uPD7759 (adpcm chip).
Notaz doc is pretty complete.

I haven't run code on it for now but I have planned to do it since a long time.
Best way to do a flashcard is to make an adapter for megadrive cart.

I still have to dump the games (french release) as I only miss one now.

Posted: **Mon Nov 28, 2011 1:49 pm**

PCM format is known; it's used by System C2 and various other Sega arcade hardware. The main difference (as far as I can tell) between µPD7759 and other members of the µPD7755 family (under which you'll find it in the Renesas archives, as Renesas now owns NEC Semiconductor's assets) is that this chip uses an external data ROM instead of an interrupt and software controlled data transfer. System C2 also banks the PCM chip's memory data to some size I forget what it is now... Renesas's site has complete enough data sheets and application manuals; the only thing missing is their ADPCM format, which is described in the MAME source but IDK its source...

EDIT

Code: Select all

uPD7755
uPD7756A
uPD77P56
uPD7757
uPD7758A
uPD7759   S13148EJ5V0UM00.pdf: http://www2.renesas.com/maps_download/dl_docpdf?lang=E&litcode=S13148EJ5V0UM00
                               (from http://www.renesas.com/search2/do/document?keylog=true&tmpl=ww&cat=doc&q=7759&sb=&num=20&sbumit01=Document+Search+Start)
          datasheet.pdf:       http://pdf1.alldatasheet.com/datasheet-pdf/view/7087/NEC/UPD7759.html
                               (from http://www.alldatasheet.com/datasheet-pdf/pdf/7087/NEC/UPD7759.html)
          datasheet(1).pdf:    http://www.datasheetarchive.com/pdf-datasheets/Datasheets-8/DSA-152772.html
                               (from http://www.datasheets.org.uk/datasheet/upd7755-datasheet.html)

from my doc archive
S13148EJ5V0UM00.pdf has the names of other docs but I can't find them