Technical data

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 <DEFAULT> 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.

7FFF

0100

DFFF

8000

FFFF

E000