1 - Al Kossow's Bitsavers

RAS ~CAS \ I2AI \ I '-2BI '-iiD1Ro2Ro3Ro4DQ'----I'----I'----I'----II»"C'E..n'0)...0':::Ien5'~o...30)...0':::IBLOCK 1 BLOCK 2 BLOCK 3 BLOCK 4FIGURE 5 - FAST ACCESS READ TIMINGThe upgrade to next generation parts and expanded memory requirements are also taken into account on theTMS441 6/TMS4500A board. When 64K X 4 parts become available, they will be pin-compatible with the 16K X 4, allowingthe user to upgrade his board to 512K bytes of memory with no added interfacing. The TMS4416 disregards two of thecolumn addresses supplied to it from the TMS4500A (CAO, CA7) which are not needed to address its 16K of memory .These two extra address lines will be used to complete the addressing needed for the 64K X 4 making upgrade a matter of installingthe new devices .The TMS4416/TMS4500A memory board demonstrates the use of a versatile, and expandable memory suitable for mostany system.MOS MemoryApplications Engineering9-42