S100 Computers

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S100 Computers Port Assignements

S100 Bus systems typically only use 8 bit port assignements (0-FFH).  In most case for 16 bit CPUs the upper 8 bits of a 16 bit port is 0H.

Below is a list of the most common ports I use in my systems.

        S100 Bus Board Port Assignments
Port IN Port OUT
0,1 Propeller Console IO Board 0,1 Propeller Console IO Board
4,5,6,7 PIO Ports Board   PIO Ports Board
       
10-13 ZFDC Disk Controller 10-13 ZFDC Disk Controller
       
20,21 8259A on MSDOS Support Board 20,21 8259A on MSDOS Support Board
28-2F Super IO Board 28-2F Super IO Board
       
30-33 IDE/CF Card Board 30-37 IDE/CF Card Board
       
40-43 8253 Timer MSDOS Board 40-43 8253 Timer MSDOS Board
       
50-57 SD Systems Versafloppy II Board 50-57 SD Systems Versafloppy II Board       
       
60-63 8255A MSDOS Support Board 60-63 8255A MSDOS Support Board
6E,6F Tarbell Tape Controller 6F Tarbell Tape Controller
       
78-7F XComp Hard Disk Controller 78-7F XComp Hard Disk Controller
       
80-86 Quasi RAM Disk, FPGA_VGA Board 80-86 Quasi RAM Disk FPGA_VGA Board
88-8F Super IO Board 88-8F Super IO Board
       
90 80286 Board    
       
A0-A3 Zilog SCC on Serial Board A0-A3 Zilog SCC on Serial Board
A4,A5 RTC ports A4,A5 RTC ports
A8-AB 8255A on Serial Board A8-AB 8255A on Serial Board
AC, AA USB Port on Serial Board AC, AA USB Port on Serial Board
       
B0-BF VGA Video Boards B0-BF VGA Video Boards
       
C0-C4 Promwriter    
       
D0-DF PC Video Board D0-D3 Z80 CPU Board Mem Map
       
ED Master/Slave S100 Bus Switch    
EF

Front Panel

   
       
F0-F7

Super IO Board

F0-F7

Super IO Board

F9-FE MS DOS Support Board    
FE System Monitor Board IOBYTE    
       
       

Remember the Z80 master Monitor "R" commands lists all Input Ports in your system. (Actually any port that don't return 0FFH).










This page was last modified on 06/19/2024