This ROM allowed for RAM disks up to 8mb. Apple and most 3rd party developers stopped supporting ROM00 after this release, making it a vital upgrade for those who had a ROM00 machine. It had toolset version 2.x and several bug fixes. Second Firmware release ROM01: Released in August 1987, this updated ROM was made as a free upgrade to all existing users. This ROM would only allow a RAM disk of up to 4mb, no matter how much RAM you had in the computer. Early version of System 1.x toolset, and only supported by the OS up to System 3.

Original Firmware release ROM00: an early almost beta-like firmware version that shipped with the IIgs for the first year. A summary of how Wikipedia lists the basic differences between the ROMs is as follows: It has built in Ensoniq synthesizer chip and support for RGB video as well support for 12mb of RAM (maybe more.)Īpple IIgs computers had three similar but different ROM versions, ROM00, ROM01, and ROM03. The last Apple II model made before the Mac took over. Converting Between Floating Point and Human Readab.Back in January, I answered a CL ad in Seattle for an Apple IIgs ROM01 Computer – $60.Replica 1 Quick Reference, Apple 1 on the Raspberr.He is hoping to restart a project they had to introduce a new replica of the original IMSAI 8080 computer. They were one of the first home computer manufacturers (along with Altair) and a portion of the company was still in business. Vince Briel is planning to purchase the assets I'm looking forward to getting the Apple Cassette Interface when Briel computers starts shipping them. It sounds like big things are in store for Briel Computers. I'll have more to say here as I explore it further. It can even generate video (which it does for the Replica 1). It is quite an amazing chip - 8 CPUs with shared memory, a built-in high level language interpreter as well as machine language, and hardware I/O ports. I've started playing with the Propeller CPU on the Replica 1.

It ran quite well although it was a little slow on the Raspberry Pi's 600MHz ARM CPU. I've ordered a hardware expansion board for the Raspberry Pi called the Gertboard and plan to use if for some hardware experiments.

For fun I compiled the POM1 Apple 1 Emulator on it. This is a very small (credit card sized), low cost ($35) embedded desktop computer that can run Linux. That directory also has some documents I wrote like a summary of the 65C6 processors and some errata for Apple 1 manuals. Earlier I made a one page reference of useful addresses for the Replica 1. I've extended that into a more comprehensive four page quick reference. You can download it from here.

Imsai 8080 emulator raspberry