Work in progress ...
A bit of a silly hobby, this page is about my tinkering with Banana & Raspberry Pi computers.
The picture below is a Raspberry Pi 4 Model B
~ which, incidentally, is serving up THIS page ~
The Pi 4 replaced this Raspberry Pi B2
~ which had 1 Gigabyte of RAM, the Pi 4
has 4 Gigabytes of RAM. ~
Back in the day, RAM was core memory.
Here is a picture of how "core" memory has evolved.
The big frame is "real core memory" with tiny ferrite cores in a 4 4 10 10 array, so 1,600 cores with
three small guage copper wires running through each one. This array provides 200 Bytes of core memory that
can store and retrieve data at a rate approaching 1 million bytes/second. Beside the 200 bytes of core, is a
64 Megabyte compact flash memory which is 320,000 times as much storage as the core memory and it can transfer
data approaching 10 megabytes/second. The flash drive beside the U.S. dime coin is a 128 Gigabyte storage, i.e.
640 million times as much storage as the core array, and transfer rates up to 80 megabytes/second.
The 200 byte core array probably cost several hundred (1960) dollars. The 128 Gigabyte memory cost $28...
The change in cost and capacity of computing over the past 50 years is quite astonishing.
I got started down this path of looking at and using these new cheap processors because of a birthday present
from my oldest daughter who was delighted that she bought me a computer that I had never heard of. Here are
pictures of that party and the machine involved. At the end of this page are some links that compare these
devices to a mainframe installation 30 years ago.
Me preparing to blow out candles, big endian binary of course, on my BD dessert which was the hint for my gift below.
The above Banana Pi (the computer, not the birthday pie)
~ which was the first small computer used to serve up THIS page ~
has more memory, computing power and storage than the -
IPSA Exchange Tower Data Center - circa 1985
and consumes a LOT less energy...
Comments or questions - contact Joey (at) 1e6.com