24 May
2017
24 May
'17
12:58 p.m.
On 5/24/2017 1:35 PM, Chuck Guzis via cctalk wrote:
On 05/24/2017 11:19 AM, ben via cctalk wrote:
I am not to sure about that.
If a schematic has a bug you can use a logic probe to find the error.
With typo in VHDL you have hard problem finding that single gate
error.
But who wants to write the software?
Yes, just so. I learned about that one decades ago.
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
Modern technology is not only cheaper, but it's faster and uses less
power--and is usually more flexible.
I suspect that a PDP-11 in FPGA is quite a bit more reliable than the
real thing--and when you're done you have a nice abstract description of
the hardware in VHDL format. And yes, I have a pile of old CMOS/ECL/TTL logic.
Remember when CMOS logic was new-- +15V Vdd and 1MHz top speed?
This is Canada. RADIO SHACK was your only place to get anything.
99 cents for 7400.
Ben.