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Originally, none of the ICs (before LSI) were configurable or programmable. Early computers and communication system were configured by hard wiring, circuit board layout, wiring patch panels (often done by women with the job title “computer”), or by manually entering a boot program via front panel switches (or punched paper tape, etc.). Some computer systems had vast amounts of front panel switches for configuration. Then came PROMs and PLAs(PALS), etc. that were “programmed” by applying high voltages to blow internal fuses to configure their logic and memories. When microprocessors were booted-up, they would then configure the other subsystems or peripheral ICs by writing to controltheir control registers in code.

At higher levels of integration these methods were often combined: a system might be configured by programming internal memories with instructions (code, software) that a processor would then use to configure other functional blocks on the chip (including other processors, which would then configure yet more subsystems, etc.)

Originally, none of the ICs (before LSI) were configurable or programmable. Early computers and communication system were configured by hard wiring, circuit board layout, wiring patch panels (often done by women with the job title “computer”), or by manually entering a boot program via front panel switches (or punched paper tape, etc.). Some computer systems had vast amounts of front panel switches for configuration. Then came PROMs and PLAs(PALS), etc. that were “programmed” by applying high voltages to blow internal fuses to configure their logic and memories. When microprocessors were booted-up, they would then configure the other subsystems or peripheral ICs by writing to control registers in code.

Originally, none of the ICs (before LSI) were configurable or programmable. Early computers and communication system were configured by hard wiring, circuit board layout, wiring patch panels (often done by women with the job title “computer”), or by manually entering a boot program via front panel switches (or punched paper tape, etc.). Some computer systems had vast amounts of front panel switches for configuration. Then came PROMs and PLAs(PALS), etc. that were “programmed” by applying high voltages to blow internal fuses to configure their logic and memories. When microprocessors were booted-up, they would then configure the other subsystems or peripheral ICs by writing to their control registers in code.

At higher levels of integration these methods were often combined: a system might be configured by programming internal memories with instructions (code, software) that a processor would then use to configure other functional blocks on the chip (including other processors, which would then configure yet more subsystems, etc.)

2 added 139 characters in body
source | link

Originally, none of the ICs (before LSI) were configurable or programmable. Early computers and communication system were configured by hard wiring, circuit board layout, wiring patch panels (often done by women with the job title “computer”), or by manually entering a boot program via front panel switches (or punched paper tape, etc.). Some computer systems had vast amounts of front panel switches for configuration. Then came PROMs and PLAs(PALS), etc. that were “programmed” by applying high voltages to blow internal fuses to configure their logic and memories. When microprocessors were booted-up, they would then configure the other subsystems or peripheral ICs by writing to control registers in code.

Originally, none of the ICs (before LSI) were configurable or programmable. Early computers and communication system were configured by hard wiring, circuit board layout, wiring patch panels, or entering a boot program via front panel switches (or punched paper tape, etc.). Then came PROMs and PLAs(PALS), etc. that were “programmed” by applying high voltages to blow internal fuses to configure their logic and memories. When microprocessors were booted-up, they would then configure the other subsystems or peripheral ICs by writing to control registers in code.

Originally, none of the ICs (before LSI) were configurable or programmable. Early computers and communication system were configured by hard wiring, circuit board layout, wiring patch panels (often done by women with the job title “computer”), or by manually entering a boot program via front panel switches (or punched paper tape, etc.). Some computer systems had vast amounts of front panel switches for configuration. Then came PROMs and PLAs(PALS), etc. that were “programmed” by applying high voltages to blow internal fuses to configure their logic and memories. When microprocessors were booted-up, they would then configure the other subsystems or peripheral ICs by writing to control registers in code.

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source | link

Originally, none of the ICs (before LSI) were configurable or programmable. Early computers and communication system were configured by hard wiring, circuit board layout, wiring patch panels, or entering a boot program via front panel switches (or punched paper tape, etc.). Then came PROMs and PLAs(PALS), etc. that were “programmed” by applying high voltages to blow internal fuses to configure their logic and memories. When microprocessors were booted-up, they would then configure the other subsystems or peripheral ICs by writing to control registers in code.