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Tandy Memory Expansion Adapter (250-4027)

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Jumper Settings

Card Type

Memory

Maximum Onboard Memory

8MB DRAM

Data Bus

Tandy 3000NL memory expansion bus

52666-1.png

USER CONFIGURABLE SETTINGS

Setting

Label

Position

»

Computer has one memory expansion slot

E1

Pins 2 & 3 closed

 

Computer has two memory expansion slots

E1

Pins 1 & 2 closed

<DIR> <DIR>

Note:E1 may not be present on all versions of this card. </DIR> </DIR>

DRAM CONFIGURATION

Setting

Bank 0

Bank 1

Bank 2

Bank 3

512KB

(2) 256K x 9

None

None

None

1MB

(2) 256K x 9

(2) 256K x 9

None

None

1.5MB

(2) 256K x 9

(2) 256K x 9

(2) 256K x 9

None

2MB

(2) 256K x 9

(2) 256K x 9

(2) 256K x 9

(2) 256K x 9

2MB

(2) 1M x 9

None

None

None

2.5MB

(2) 256K x 9

(2) 1M x 9

None

None

3MB

(2) 256K x 9

(2) 256K x 9

(2) 1M x 9

None

3.5MB

(2) 256K x 9

(2) 256K x 9

(2) 256K x 9

(2) 1M x 9

4MB

(2) 1M x 9

(2) 1M x 9

None

None

4.5MB

(2) 256K x 9

(2) 1M x 9

(2) 1M x 9

None

5MB

(2) 256K x 9

(2) 256K x 9

(2) 1M x 9

(2) 1M x 9

6MB

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

None

6.5MB

(2) 256K x 9

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

8MB

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

(2) 1M x 9

Note:The memory installed on the mainboard must be removed in order to use this card.

Within each bank, the SIMMs must be the same size. Banks may contain either 256K or 1M SIMMs.