If you have a IIsi with this ROM, the computer will not function without it. There is a ROM SIMM slot on the Mac IIsi which may be filled with a IIsi ROM, although this is rare, since the IIsi generally has ROMs on the motherboard.
This is usually caused by poor contact between the speaker wire and the plug on the motherboard and can often be fixed by cleaning and coating the contacts on the motherboard with electrical cleaner and lubricant. The IIsi is noted for a sound problem where the internal speaker may fail to sound. (Note that this program is worthless if you’re using virtual memory or RAM Doubler.)Īlong with the LC, the IIsi was one of the first Macs with audio input. This can be done by creating a large-but-slow 768 KB disk cache or using IIsi-RAM-Muncher by Paul Ripke. Another is to set aside the first 1 MB of RAM, since that is the bank shared for video and program space. One way to speed things up is to add either a PDS or NuBus video card (see our NuBus Video Card Guide for more information). Like the IIci, the IIsi uses onboard RAM for video, which slows the computer slighty. (Apple had intended it as a 25 MHz computer, but chose to scale back the speed to avoid cutting into IIci sales.) Chipping the IIsi to 25 MHz – or even 28 MHz – is not unusual. Cost saving measures included eliminating NuBus expansion slots, soldering 1 MB of RAM to the motherboard, and using a slower CPU (20 MHz instead of 25 MHz).Īlthough the IIsi was marketed as a 20 MHz computer, users quickly discovered it used parts rated at 25 MHz.
The IIsi was designed as a less expensive, less expandable alternative to the Mac IIci. But with an adapter, the PDS can be converted to a NuBus slot, making it a legitimate member of the Mac II family (all other members of the Mac II family have built-in NuBus slots). Like the LC, it has no built-in NuBus slot, is quite short, and has a curved front.
Like the SE/30, it has a 68030 PDS (Processor Direct Slot) for expansion. The IIsi shares some features with the SE/30, some with the LC series, and some with the Mac II series.
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