Category Archives: EISA


A few weeks back I was reminded that the source code to the 386MAX (later Qualitas MAX) memory manager was released in 2022 on github. Back in the 1990s I used primarily EMM386 and QEMM, but I have some experience … Continue reading

Posted in 386MAX, DOS, EISA, Source code | 10 Comments

EISA Specification 3.1

While researching the Compaq Intelligent Drive Array (IDA), a circa 1990 EISA-based IDE RAID controller, I quickly established that there’s very little surviving information about it, and most of what there is can be found in two or three patents … Continue reading

Posted in Documentation, EISA | 19 Comments

Children of the Bus Wars

In the late 1980s and the early 1990s, the so-called Bus Wars raged. A few years after the PC/AT was released, it became clear that the ISA bus could not keep pace with faster CPUs and peripherals, especially graphics cards … Continue reading

Posted in ATi, EISA, MCA, PC history, PCI, VLB | 11 Comments