8080A SYSTEM CONTROLLER AND BUS DRIVER
NEe Microcomputers, Inc.
fttIEC
Jl,PB8228 J.I PB8238
8080A SYSTEM CONTROLLER AND BUS DRIVER
OESCR IPTION
The pPB8228...
Description
NEe Microcomputers, Inc.
fttIEC
Jl,PB8228 J.I PB8238
8080A SYSTEM CONTROLLER AND BUS DRIVER
OESCR IPTION
The pPB8228/8238 is a single chip cOntroller and bus driver for 8080A based systems. All the required interface signals rrecessary to connect RAM, ROM and I/O components to a pPD8080A are generated.
The pPB8228/8238 provides a bi·directional three·state bus driver for high TTL fan-out and isolation of the processor data bus from the system data bus for increased noise immunity.
The system controller portion of the pPB8228/8238 consists of a status latch for definition of processor machine cycles and a gating array to decode this information for direct interface to system components. The controller can enable gating of a multi·byte interrupt onto the data bus or can automatically insert a RESTART 7 Onto the data bus without any additional components.
Two devices are provided:. the pPB8228 for small systems without tight write timing constraints and the pPB8238 for larger sy...
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