2MB and 4MB Memory Daughterboards affects XEN-S, XEN-LS, LANstation, LS386SX, Qi 300, Qi 386SX

See Also
IPB 4022 - IPB 4027 - IPB 4033 - IPB 4044
IPB 4046 - IPB 4060 - IPB 4068 - IPB 4100

Due to the introduction of the LS386SX and XEN-LS machines, the daughterboards have been changed to fit both old and new variants.

The change is a reduction in height and the addition of three switches to enable varying base memory addresses. Firstly to fit to a XEN-S, two height extenders are shipped with the module. It is necessary to fit the height extenders into the memory sockets on the motherboard before fitting the memory module; failure to do so will result in the memory module fouling motherboard components.

The three switches added to the memory module are only to be changed if you are fitting it to a 2MB base system (i.e. has 2MB of memory soldered to the motherboard).

For 1MB and 4MB base systems, the switches must be set to position 1 (furthest away from the locating hole)

For 2MB base systems, the switches must be set to position 2 (nearest to the locating hole.)

Identifying the Amount of Memory

To identify the amount of memory on the Daughter Board, simply look at the number of rows of chips. Each row of four chips represents 2MB of memory. At the moment the new style daughter board is only used for 2 and 4MB modules; however in the future all memory daughter boards will be of this kind. The top of the board can hold three rows of chips, giving 2, 4 or 6MB, the 8MB boards will have an extra row of chips on the underneath.

Note: 1MB memory boards have 2 rows of 256K chips and no switches.