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The Apple IIc Plus (identified as ROM '5') was the first IIc model to see significant changes. This IIc also came with an improved "clicky" keyboard. Previous versions of the IIc didn't support memory expansion without special tricks and hacks, as there was no such socket. The most significant difference was an internal memory expansion socket for plugging in RAM cards (up to 1 MB). The next two revisions of the IIc (identified as ROM '3' and '4') not only saw a new firmware change, but a slightly redesigned motherboard. Rudimentary support hooks for an AppleTalk interface were added to the firmware, but later removed from future IIc's when the device was cancelled. The second IIc ROM revision (identified as ROM '0') added support for an external Apple UniDisk 3.5-an 800 kB "dumb" floppy drive. An oscillator on newer mainboards fixed the problem).
#Apple iie rom zip serial
Early motherboards, specifically those manufactured between April 1984 and December 1984, had faulty serial ports that caused problems with some brands of modems and printer at speeds of 1200 baud or higher (it relied on a 74LS161 to divide the clock for the serial ports, which was 3% too slow. The original Apple IIc (identified as ROM version '255') could only support a single external 5.25 through its disk port. The Apple //c+ was discontinued in November of 1990.įrom a historic viewpoint, I think the most relevent facts would be that there were 5 different IIc ROM revisions (ROM 255, 0, 3, 4 and 5) and three different IIc motherboards (original, memory expandable, IIc Plus). The Apple //c+ (pictured right) was introduced in 1988, with a 4 MHz 65C02, RAM expandable to over 1 MB, a larger ROM, and an optional internal 800 kB 3.5" drive. It had 128 kB RAM, (expandable to 1 MB) a built-in 5.25" floppy drive on the side, and could be used with a mouse. It came in a small off-white case, and was built around an enhanced 65C02 processor, running at 1.4 MHz. Introduced in April of 1984, the Apple //c was the first compact model in the Apple lineup.
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#Apple iie rom zip upgrade
The //c was considered a "closed system", and while third-party products allowed users to upgrade their RAM to 1 MB, but only by voiding the warrenty in the process. Monitor: Standard 9" Green monochrome, optional LCD panel. Codename: ET, IIb, IIp, Pippin, VLC, Elf, Yoda, Teddy, Chels, Jason, Lollie