发明名称 |
A MEMORY SYSTEM WITH FLEXIBLE REPLACEMENT UNITS |
摘要 |
A read only memory system with replaceable units is provided in which the replacement units have a variable capacity. In addition, the system is sufficiently flexible so that a replacement unit substituted for an original unit may subsequently be removed from the system once and the original unit restored. The read only memory system has a fixed main read only memory with a plurality of addressable units of uniform capacity in combination with a substitute memory of a greater capacity than the addressable units. A control is provided with the capability of selectively disabling units of a fixed memory. It also can selectively enable a portion of the substitute memory and substitute the enabled portion for a disabled fixed memory unit. The control is also capable of selectively varying the capacity of the substituted enabled unit. |
申请公布号 |
DE3276729(D1) |
申请公布日期 |
1987.08.13 |
申请号 |
DE19823276729 |
申请日期 |
1982.01.19 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
BRINGOL, CHARLES RONALD;KROEGER III, WILBERT LOUIS |
分类号 |
G11C29/04;G06F9/06;G06F9/445;G11C16/02;G11C17/00;(IPC1-7):G06F11/20 |
主分类号 |
G11C29/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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