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m Typo correction: removed unnecessary pluralization of 'kbyte'. |
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It was common to offer the internal bus through an expansion connector, or at least the space for such a connector to be soldered on. This was a low-cost option and offered the potential for expansion, even if it was rarely made use of. Typical expansions would be I/O devices, or memory expansion. It was unusual to add peripheral devices such as tape or disk storage, or even a CRT display
When [[#Single-chip microcontrollers|single-chip microcontroller]]s, such as the [[8048]], became available later on, the bus no longer needed to be exposed outside the package as all the necessary memory could be provided within the chip package. This generation of processors used a [[Harvard architecture]] of separate program and data buses, both internal to the chip. Many of these processors used a [[modified Harvard architecture]], where some write access was possible to the program data space, thus permitting in-circuit programming. None of these processors required, or supported, a Harvard bus across a single-board
== External bus expansion ==
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