Main Storage And Main Mpu; Feature Main Storage Card (A-B5) - IBM 5280 Technical Newsletter

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FEATURE MAIN STORAGE CARD (A-B5)
The diskette/main MPU card (303) contains 32 K bytes
of main storage. Additional storage may be located on
I
optional 16K, 32K, or 64K byte main storage cards. This
optional storage is added in card location 85.
The storage capacity of each feature main storage card is
indicated by a color marked on the end of the card. The
blue code indicates a 16K byte card, the orange code
indicates a 32K byte card, and the red code indicates a
64K byte card.
The switches on the storage card must be set to indicate
the starting address of the storage on that card. Because
the diskette/main MPU card contains the first 32K bytes
of main storage, switch 5 (32K byte) must be set to the
On position.
All other switches must be set to the Off position.
On
11121314151617181
Off
Color
Code
TP01
•
Page of SY31.Q600-1
As
updated April 16, 1981
By TNL SN20-9688
. If the card has a removable plastic cover (part 8331528)
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over the switches, remove the cover to change the settings of
the switches. After you have changed the settings of the
switches, reinstall the,cover over the switches.
If the card does not have a removable plastic cover over the
switches, see the following illustration for an example of how
to set the switches. Ignore the red indicator and set the
switches to the desired setting.
Main Storage and Main MPU 59