FM 456-2 Functions and Technical Data
4-13
FM 456-2 Application Function Module Installation, Hardware, and Startup
C79000-G7076-C458-01
4.11
Address and Interrupt Assignments
This section contains detailed information in tabular form about I/O address area
mapping, memory and interrupt assignments in the FM 456-2 application function
module.
Memory Assignment
The main memory is assigned as follows in the FM 456-2:
Table 4-5
Main Memory Assignment
Address
Content
1 MB to 15 MB
*)
or to 16 MB
User memory area
E 8000H to F FFFFH
BIOS
E 0000H to E 7FFFH
Free (32 K)
D 4000H to D FFFFH
Free (48 K)
D 0000H to D 3FFFH
Reserved for CP 1401 (16 K)
C F000H to C FFFFH
Free (16 K)
C C000H to C EFFFH
Memory card, otherwise free (12 K)
C 8000H to C BFFFH
Reserved (32 K)
C 0000H to C 7FFFH
Shadow VGA BIOS (32 K)
A 0000H to B FFFFH
VGA (128 K)
0 0000H to 9 FFFFH
640 K system area
*)
If the interface submodule IF 964-DP is not plugged in the preferred slot (see
page 4-10)
Keeping Memory Areas Free
The memory areas that are not always marked as “free” should be kept free when
using a memory manager.
SRAM Area
The size of the SRAM with battery backup is 256 Kbytes (net for data blocks
244 Kbytes). If the battery is removed and inserted again when there is no power
connected, the SRAM content will be lost. This is indicated by the BAF LED.