GeoRAM

GeoRAM is a memory expansion for the Commodore C64 and C128 home computer. It has a capacity of 512 KiB, and came in 1991 as a replacement for the no longer manufactured Commodore REUs on the market.

Your name, the memory expansion from the GEOS operating system for which it was primarily intended. Away from the GEOS operating system, the GeoRAM was rather underused.

In contrast to the REUs Commodore GeoRAM has no DMA chip and therefore can not independently effect the data transfer between private and C64/C128-RAM. Rather, in In-/Output the C64 a 256 -byte memory block is displayed ($ DE00 -$ DEFF ), from or in a program, the data needs to copy itself. The selection of the memory block via the address $ $ DFFE DFFF (which were reflected in the entire second range IO ). The programming is very simple. The additional functions of the DMA -based Commodore REUs, such as the fast moving or filling of storage areas, were not at GeoRAM available.

Since 2006, up to 2MB upgradeable development of GeoRAM called NeoRAM.

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