Apple Macintosh IIsi
Sharing features with the SE/30, LC series, and of course the II series the Macintosh IIsi was introduced in October 1990 as a less expensive, and thus less expandable, alternative to the IIci. As with the IIci the IIsi has onboard video but also had 1MB of RAM soldered to the logic board. Unlike the rest of the II series there is no built in NuBus slot but with an adapter the PDS can be converted into one.
Also the case for the IIsi is unique as it was designed specifically for this model but unlike all the other Macintosh case designs was never used again.
I obtained this system at a local Swap Meet for $20 along with an Apple Extended Keyboard II and Apple Desktop Bus Mouse II that were my initial target. After seeing it had some form of ethernet I grabbed it as the seller seemed to want to get rid of it.
It was some time until I tested the unit but when I did I found that it didn't actually work. So I stripped the unit down and proceeded to try and determine what was wrong. The first fault I found was with the RAM so I took the opportunity to replace the 4x 1MB simms with 4x 4mb simms that I wasn't using. The next and final problem was a strange incompatability between the 80mb hard drive and the IIsi, however working on it again some time later it worked perfectly.
|CPU|| 20MHz Motorola 68030
optional 68882 Floating Point Unit
|RAM|| 1MB on Logic Board
up to 17MB in 4x 30 pin slots
|Video|| 512x384 8-bit colour
640x480 8-bit colour
|I/O Ports||Printer, Modem, Speaker, Microphone, Apple Desktop Bus|
|Expansion||1 Nubus or PDS Slot|
|Sound|| stereo 8 bit output
mono 8 bit (mic included)
|Drives|| 1.44MB Floppy Drive
40-80MB SCSI Hard Drive
External SCSI and Floppy Connectors
|Operating System||Mac OS (6.0.7 up to 7.6.1)|
|iisi-01.jpg, 1280x1024, 149KB|
|A complete system consisting of the IIsi, a display, Keyboard II, and Desktop Bus Mouse II.|
|iisi-02.jpg, 1200x900, 103KB|
|Closeup of the front of the unit which features a power light and a auto-inject floppy drive.|
|iisi-03.jpg, 1200x900, 195KB|
|Removing the top cover exposes the drives at the front of the case with the logic board and power supply at the rear.|
|iisi-04.jpg, 1200x900, 245KB|
|The drives, expansion card, power supply and fan can be removed to expose all of the the logic board.|
|iisi-05.jpg, 1280x1024, 232KB|
|The Asante Mac Con for IIsi provides ethernet capabilities. Attached to the rear of the case via a colourful ribbon cable is the ethernet tranceiver.|
|iisi-06.jpg, 1200x900, 134KB|
|The rear of the unit features the standard array of ports across the bottom with the space for an expansion card at the top right.|