This is the recovered Machine Room from 2005. Please don't expect wonders. The look and feel of this site is nine years
old, and so is its code. Some of the functionality has been recovered while the rest of
the site is modernised and restructured. Watch this space!
The rate at which the
CPU works. This is for comparison against same CPU types only!
Remember: comparing clock rates for different CPUs is not a
measure of speed. See question 11 in the FAQ
(about CPUs) for more information.
The maximum number of bits the CPU can handle at once with its
hardware and instruction set. This is the thing one refers to when
mentioning, for instance, that the PDP-8 is a 12-bit
machine, while the Jupiter Ace has an 8-bit CPU.
Hardware compatibility standards (and de facto standards) that computers share.
Have a look at this if you're trying to research how many
computers used a certain bus like VME or S100, among other things.
This lists the number of colours the machine's video subsystem
can display. This is not the number of colours that can be displayed
simultaneously, just the maximum colour resolution of the machine. For
instance, a standard 1987 IBM VGA adapter would be listed as
having 262,144 (256Ki) colours, although it can only display up to 256 of them
at the same time.
The size of the
computer's memory in kilobytes (1 kbyte = 1024 bytes). Some machines
may come with different amounts of memory depending on the exact
model or configuration. These have multiple entries in the
Many of the machines listed here have a tape interface for storing
programs onto normal audio tapes (argh, I feel old when I have to explain
something as self-evident as this! And I haven't even mentioned
paper tape yet). This cross-reference lists the speed of this tape
interface in bauds. Actually the unit is bps (bits per second), but on all
micros with a tape interface, one baud happens to be one bps (it simplifies the
computers that didn't have a tape interface had a floppy interface (some had
both, some had none). Some of them came with a floppy drive as standard. This
cross-reference lists the total storage space afforded by the floppy
controller of each machine. The controller is assumed to be connected to the
maximum possible number of drives and the drives are assumed to be using the
largest acceptable media. Numbers are in kilobytes. If you see any numbers in
excess of 5120 KiBytes (5 MiB), it probably means the machine comes with some
sort of hard drive installed.