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Although great looks aren’t a feature of the ZX-GR, the unit is well-built and stable. I had no problems with wobble as I did with the Timex 16K RAM pack. The edge connector is attached to the unit by way of a 3 inch ribbon cable which adds to the stability of the unit.
Actually, like all “64K” RAM packs, the ZX-GR is only 56k, 48 of which is useable for basic programming. The other 8k is located in the unused 8-16k block of memory, which can be used for machine language programming or data tables. When using the ZX-GR with another hardware unit which requires the 8-16K block of memory, you must flip the switch on the front of the unit to the left. If you wish to use this block of memory, make sure the switch is in the correct position.