Motorola CMD11E1 - Manual (Page 11)

11
Memory Selection Jumpers JP3 – JP10
The factory setting for the jumpers should be correct for the memory devices that came with your
board. If you add or modify the type or size of memory, you must change the following jumpers
accordingly. All jumpers are two-pin jumpers and are installed vertically.
U7 - ROM or EEPROM
JP8 JP9 JP10 U7 DEVICE
OFF OFF ON 8k EEPROM < DEFAULT >
OFF OFF OFF 8k EPROM.
OFF ON OFF 32k EPROM.
ON OFF ON 32k EEPROM.
JP10 write protects U7 memory device when OFF.
U6 - RAM or EEPROM or ROM
JP4 JP5 JP7 JP6 U6 DEVICE
OFF OFF OFF ON 8k RAM or EEPROM.
OFF OFF OFF OFF 8k EPROM.
OFF ON ON OFF 32k EPROM.
ON OFF ON ON 32k RAM or EEPROM. < DEFAULT >
JP6 write protects U6 memory device when OFF.
U5 - RAM
For 32K device JP3 = ON 32K bytes from 200 hex to 7FFF
hex (minus register area, see memory map) and
recommended position for Buffalo Monitor and Small C
operation. No segmentation occurs.
For 8K device JP3 = OFF 8K bytes from 0000 hex to 1FFF hex and
mirrored at 2000 – 3FFF, 4000 – 5FFF, and 6000 - 7FFF.
This position will allow CPU internal Ram and I/O ports to
segment the 8K address space. Use this position to run
Basic11 with an 8K device.
You can determine the size of memory devices by reading the label on top of the chip. Memory
devices that contain 64 in the part number are usually 8K. Those with 256 are usually 32K.
The type of memory can also be determined by reading the chip label. If you don’t recognize the
memory type you can look up the part number in a catalog or device manual. If the chip is by
Atmel™ or XICOR™ it is probably an EEPROM. If it has HY or SEC it is probably RAM.
U5
7FFF
0100
U6
DFFF
8000
U7
FFFF
E000