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IBM 512KB Memory Expansion Option  -  Switches


STEP 1:  Set switches W6=on, W7=on,W8=on, W14=off, W15=on, W16=off

STEP 2:  Set the remaining switches per the table below.

Starting address Switch settings     Comment
1 MB W1=on, W2=on, W3=on, W4=off, W5=on  /  W9=on, W10=on, W11=on, W12=off, W13=on  Make sure you do STEP 1 as well.
1.5 MB W1=on, W2=on, W3=on, W4=off, W5=off  /  W9=on, W10=on, W11=on, W12=off, W13=off  Make sure you do STEP 1 as well.
2 MB W1=on, W2=on, W3=off, W4=on, W5=on  /  W9=on, W10=on, W11=off, W12=on, W13=on  Make sure you do STEP 1 as well.
2.5 MB W1=on, W2=on, W3=off, W4=on, W5=off  /  W9=on, W10=on, W11=off, W12=on, W13=off  Make sure you do STEP 1 as well.
3 MB W1=on, W2=on, W3=off, W4=off, W5=on  /  W9=on, W10=on, W11=off, W12=off, W13=on  Make sure you do STEP 1 as well.
3.5 MB W1=on, W2=on, W3=off, W4=off, W5=off  /  W9=on, W10=on, W11=off, W12=off, W13=off  Make sure you do STEP 1 as well.
4 MB W1=on, W2=off, W3=on, W4=on, W5=on  /  W9=on, W10=off, W11=on, W12=on, W13=on  Make sure you do STEP 1 as well.
4.5 MB W1=on, W2=off, W3=on, W4=on, W5=off  /  W9=on, W10=off, W11=on, W12=on, W13=off  Make sure you do STEP 1 as well.
5 MB W1=on, W2=off, W3=on, W4=off, W5=on  /  W9=on, W10=off, W11=on, W12=off, W13=on  Make sure you do STEP 1 as well.
5.5 MB W1=on, W2=off, W3=on, W4=off, W5=off  /  W9=on, W10=off, W11=on, W12=off, W13=off  Make sure you do STEP 1 as well.
6 MB W1=on, W2=off, W3=off, W4=on, W5=on  /  W9=on, W10=off, W11=off, W12=on, W13=on  Make sure you do STEP 1 as well.
6.5 MB W1=on, W2=off, W3=off, W4=on, W5=off  /  W9=on, W10=off, W11=off, W12=on, W13=off  Make sure you do STEP 1 as well.
7 MB W1=on, W2=off, W3=off, W4=off, W5=on  /  W9=on, W10=off, W11=off, W12=off, W13=on  Make sure you do STEP 1 as well.
7.5 MB W1=on, W2=off, W3=off, W4=off, W5=off  /  W9=on, W10=off, W11=off, W12=off, W13=off  Make sure you do STEP 1 as well.
8 MB W1=off, W2=on, W3=on, W4=on, W5=on  /  W9=off, W10=on, W11=on, W12=on, W13=on  Make sure you do STEP 1 as well.
8.5 MB W1=off, W2=on, W3=on, W4=on, W5=off  /  W9=off, W10=on, W11=on, W12=on, W13=off  Make sure you do STEP 1 as well.
9 MB W1=off, W2=on, W3=on, W4=off, W5=on  /  W9=off, W10=on, W11=on, W12=off, W13=on  Make sure you do STEP 1 as well.
9.5 MB W1=off, W2=on, W3=on, W4=off, W5=off  /  W9=off, W10=on, W11=on, W12=off, W13=off  Make sure you do STEP 1 as well.
10 MB W1=off, W2=on, W3=off, W4=on, W5=on  /  W9=off, W10=on, W11=off, W12=on, W13=on  Make sure you do STEP 1 as well.
10.5 MB W1=off, W2=on, W3=off, W4=on, W5=off  /  W9=off, W10=on, W11=off, W12=on, W13=off  Make sure you do STEP 1 as well.
11 MB W1=off, W2=on, W3=off, W4=off, W5=on  /  W9=off, W10=on, W11=off, W12=off, W13=on  Make sure you do STEP 1 as well.
11.5 MB W1=off, W2=on, W3=off, W4=off, W5=off  /  W9=off, W10=on, W11=off, W12=off, W13=off  Make sure you do STEP 1 as well.
12 MB W1=off, W2=off, W3=on, W4=on, W5=on  /  W9=off, W10=off, W11=on, W12=on, W13=on  Make sure you do STEP 1 as well.
12.5 MB W1=off, W2=off, W3=on, W4=on, W5=off  /  W9=off, W10=off, W11=on, W12=on, W13=off  Make sure you do STEP 1 as well.
13 MB W1=off, W2=off, W3=on, W4=off, W5=on  /  W9=off, W10=off, W11=on, W12=off, W13=on  Make sure you do STEP 1 as well.
13.5 MB W1=off, W2=off, W3=on, W4=off, W5=off  /  W9=off, W10=off, W11=on, W12=off, W13=off  Make sure you do STEP 1 as well.
14 MB W1=off, W2=off, W3=off, W4=on, W5=on  /  W9=off, W10=off, W11=off, W12=on, W13=on  Make sure you do STEP 1 as well.
14.5 MB W1=off, W2=off, W3=off, W4=on, W5=off  /  W9=off, W10=off, W11=off, W12=on, W13=off  Make sure you do STEP 1 as well.
15 MB W1=off, W2=off, W3=off, W4=off, W5=on  /  W9=off, W10=off, W11=off, W12=off, W13=on  Make sure you do STEP 1 as well.
15.5 MB W1=off, W2=off, W3=off, W4=off, W5=off  /  W9=off, W10=off, W11=off, W12=off, W13=off  Invalid selection.  Card would conflict with motherboard's BIOS ROM's.