24 May
2017
24 May
'17
6:19 p.m.
On 05/24/2017 02:19 PM, ben via cctech wrote:
On 5/24/2017 12:30 AM, Chuck Guzis via cctalk wrote:
I have a load of all of those... 2901Cs the faster ones. The 2901 tends
to force
the flavor of the hardware and instructions toward microcoded machine.
If your doing your own design an interesting flavor is a TTA, Transport
Trigged Architecture
sometimes called a OIS (one instruction machine). For that the machine
has one instruction
I did a Move machine and the whole word is source, destination and
options like jump if zero.
Tends to be very unique, can be fast and fairly simple since the
instruction cycle is fetch, do,
and repeat. That can also be used as a microcode engine for a more
conventional machine.
When you build its hand to not dream.
Allison
On 05/23/2017 05:31 PM, Andrew Harvey via cctalk
wrote:
But who wants to write the software?
I am building a 1977 ttl style computer because now I have spare time.
Finding vintage or similar devices is being a challenge as well fighting
modern OS to have even a C compiler and a TEXT editor.
Technology is not better, just cheaper.
I plan to use a low of LOW POWER 22V10's and undefined ALU logic
since I have several designs I want to play with. NOW is your last
chance to buy small quantities of things like 2901's and small TTL RAM's
and floppy disks.
I don't think Indivudual Computers make the
catweasle any more. They
never
released a 64bit Windows driver for it.
In point of advancing technology, one can purchase a STM32F4 development
board with USB, UART, microSD, battery-backed RTC and oodles of timers
and I/Os as well as a TFT interface for less than $12 shipped. Almost
all I/Os are 5V tolerant--and can be configured as open-drain if
desired. 192KB of fast SRAM and a CPU running at about 168MHz.
Perfectly capable of doing sampling of floppy output.
Why would anyone want a Catweasel at this stage? Technology has moved
past that.
--Chuck Ben.