Satellite Pro 4200 recognize RAM only in slot B

I have recently obtained a Satellite Pro 4200 and want to increase the memory to 320MB.
To start I purchased a 128MB module and have found that with a 64MB module in one slot and the 128 MB in the other the system only recognises the module in slot B.
Does the modules in the two slots have to be the same value for the system to recognise them? i.e. both 128MB or both 64MB.
If this is the case its OK but if it is not I dont want to purchase another 128MB module if the slot is unservicable.
Thanks
Billabilla.

Hi
Wow Sat Pro 42000 is an oldie I didnt think that someone would use this notebook in the future I mean it was a great notebook but the performance it too low for present-days.
As far as I know the Satellite Pro 4200 was equipped with Mobile Intel Celeron 500Mhz or with an Intel Pentium III 450Mhz/500Mhz.
The units equipped with Pentium 450Mhz CPU can be upgraded up to 320MB. All other units can be upgraded up to 576MB.
I think the 64MB module should not be removed!!!
You have to use 64MB + 128MB or 256MB or 512MB (only for models with 500Mhz CPU).
Hope this helps you

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