13-09-2006, 11:19
La goma de borrar ya la usábamos en 1969 cuando yo trabajaba para Philips Electrologica NV y sus ordenadores P350 y calculadoras P250.
Y desde entonces nunca ha fallado.
Te adjunto la nota técnica que explica el tema de "pitos" de arranque en el mac:
The power-on self-test resides in the ROM of the computer. This test runs whenever the computer is powered on After being fully shut down (the power-on self-test does not run if the computer is only restarted).
If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below.
If you experience one of these beeps, you should call your Apple-authorized service provider for additional troubleshooting assistance.
1 beep = No RAM installed/detected
2 beeps = Incompatible RAM type installed (for example, EDO)
3 beeps = No RAM banks passed memory testing
4 beeps = Bad checksum for the remainder of the boot ROM
5 beeps = Bad checksum for the ROM boot block
Products introduced after October, 1999 use a revised set of power on self-test beeps during startup.
The power on self-test resides in the ROM of the computer. This test runs whenever the computer is turned on after being fully shut down (the power-on self-test does not run if the computer is only restarted).
If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below.
If you experience one of these beeps, you may call your Apple Authorized Service Provider for additional troubleshooting assistance.
1 beep = no RAM installed
2 beeps = incompatible RAM types
3 beeps = no good banks
4 beeps = no good boot images in the boot ROM (and/or bad sys config block)
5 beeps = processor is not usable
In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.
Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.
Y desde entonces nunca ha fallado.
Te adjunto la nota técnica que explica el tema de "pitos" de arranque en el mac:
The power-on self-test resides in the ROM of the computer. This test runs whenever the computer is powered on After being fully shut down (the power-on self-test does not run if the computer is only restarted).
If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below.
If you experience one of these beeps, you should call your Apple-authorized service provider for additional troubleshooting assistance.
1 beep = No RAM installed/detected
2 beeps = Incompatible RAM type installed (for example, EDO)
3 beeps = No RAM banks passed memory testing
4 beeps = Bad checksum for the remainder of the boot ROM
5 beeps = Bad checksum for the ROM boot block
Products introduced after October, 1999 use a revised set of power on self-test beeps during startup.
The power on self-test resides in the ROM of the computer. This test runs whenever the computer is turned on after being fully shut down (the power-on self-test does not run if the computer is only restarted).
If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below.
If you experience one of these beeps, you may call your Apple Authorized Service Provider for additional troubleshooting assistance.
1 beep = no RAM installed
2 beeps = incompatible RAM types
3 beeps = no good banks
4 beeps = no good boot images in the boot ROM (and/or bad sys config block)
5 beeps = processor is not usable
In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.
Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.
Principio de Hanlon:
«Nunca le atribuyas a la maldad lo que puede ser explicado por la estupidez»
«Nunca le atribuyas a la maldad lo que puede ser explicado por la estupidez»