It is currently Mon Oct 23, 2017 1:56 pm

All times are UTC - 7 hours





Post new topic Reply to topic  [ 1 post ] 
Author Message
PostPosted: Fri Aug 04, 2017 6:09 pm 
Online

Joined: Sun Apr 13, 2008 11:12 am
Posts: 6301
Location: Seattle
I was taking a closer look at the various boards in NesCartDB that use the SS88006 and I think previous documentation about how the ADPCM IC playback works is probably wrong.

(For the record: boards JF-23, -24, -25, -29, -37 without battery+PRGRAM; -27, -40 with)

I'm have this strong hunch that writes to $F003 are latched on (at least) two of the pins on the SS88006, and those pins are connected to the µPD775x /PLAY and /RESET pins ... CPU D2 through D7 are connected to µPD775x I0 through I5

From tracing pictures of the PCB, I was able to get half the SS88006's pinout:
Code:
    M2 -> | 01  42 | -- +5
CPUA12 -> | 02
CPUA13 -> | 03
CPUA14 -> | 04
PRGA16 <- | 05
PRGA15 <- | 06  37 | -> /START
PRGA14 <- | 07
PRGA13 <- | 08
PRG/OE <- | 09
PRGA17 <- | 10
 ?a18? <- | 11
 CPUA1 -> | 12
 CPUA0 -> | 13
 CPUD0 -> | 14
 CPUD1 -> | 15
 CPUD2 -> | 16
  ?D3? -> | 17
   R/W -> | 18
/ROMSL -> | 19
  /IRQ <- | 20
   Gnd -- | 21


It'd be really nice if someone had the parts on hand to take a closer look ...


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC - 7 hours


Who is online

Users browsing this forum: Bing [Bot], Diskover, Google Adsense [Bot] and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group