Expansion slot

Pins layout

SIDE A
(Solder side)
I/OPin numberI/OSIDE B
(Part side)
GND - 1-GND
GND - 2-GND
+5V - 3-+5V
+5V - 4-+5V
AB0 O 5-EXTRXRDY
AB1 O 6--
AB2 O 7IMWAIT
AB3 O 8IINT4
AB4 O 9IINT3
AB5 O10IINT2
AB6 O11IFDINT1
AB7 O12IFDINT2
AB8 O13ODB0
AB9 O14ODB1
AB10 O15ODB2
AB11 O16ODB3
AB12 O17ODB4
AB13 O18ODB5
AB14 O19ODB6
AB15 O20ODB7
RD O21OMEMR
WR O22OHIGH
MREQ O23OIOW
IORQ O24OIOR
M1 O25OMEMW
RAS0 O26?DMATC
RAS1 O27?DMARDY
RFSH O28IDRQ1,2
MUX O29ODACK1,2
WE O30O4CLK
ROMKILLI31INMI
RESET O32IWAITRQ
SCLK O33-+12V
CLK O34--12V
V1 ?35?V1
V2 ?36?V2
SignalFunction
MWAITAdd 1 wait to memory cycle (same function as setting with dip switch)
ROMKILLProhibits the main unit device from responding to accesses from 0000h to 7FFFh
4CLK15.9744 MHz
SCLK76.8 kHz ?
CLK3.9936 MHz
HIGHPulled up to +5V

Expansion board size



This is an actual measurement of the Sanhayato MCC-151 that I possess, so it is for reference only...

User I/O addresses

Are I/O addresses 80h to 8Fh only available to users ?

PortsFunctions
90h-9FhCD-ROM I/F
A0h-A3hLAN, PSG
B4h-B5hVideo Art Board
BCh-BFhParallel
C2h-C3hSIO
C4h-C7hPSG
D0h-D8hGP-IB, PSG
DCh-DFhModem
F3h-F7h8'FDD