Ouch! Yes, things are so much easier nowadays.W. H. Heydt wrote: ↑Tue Jul 30, 2019 9:11 pmThings were proceeding nicely. Then one day a couple of weeks before the APS-u5 was supposed to go live, the Computing Services Newsletter had to be typeset. This was to be done on the CAT-4. The operator failed to properly secure the wingnut holding the alternate font wheel that the newsletter used. Pretty much instantly, the interior of the CAT-4 was filled with a vast number of very tiny shards of glass...
8080 was probably more like 0.5mips in practice. A72 ARM is multi-issue, out of order so much more than 1gip; likely 1.5 at least. And, obviously, at least 4 x the data width, so multiply the effect again by some value.
That's so cool! I started working in the commercial computer business with S-100 computers (8080 and Z80) running CP/M as well as MP/M systems a bit later before IBM took over the market.MisterEd wrote: ↑Wed Jul 31, 2019 2:43 amPeople think of NASA as high-tech but in the early 1980's secretaries were not allowed to have their own desktop PCs. We had an unused microcomputer sitting around so I proposed we convert it to be used for all the secretaries to use for word processing. I was given the go ahead to build the system. Remember we had to keep a low profile since this officially would never be allowed.
The specs as best as I can remember were:
CPU: Intel 8080 at 4 MHz
RAM: 7 x 64 KB (62 KB available for each user)
HDD: 2 x 20 MB
Terminals: 6 x DEC VT100 compatible
Printer: 4 x Diablo 630
Operating System: Digital Research MP/M (multi-user version of CP/M)
Users: 6 secretaries
Remember all the secretaries were using the same computer at the same time. All this one a little Intel 8080 CPU.
A regular computer printer was unacceptable since the secretaries normally used IBM Selectric typewriters. Also, a lot of documents had to be professional done because they went to NASA headquarters in Washington. I chose the Diablo 630 printer because it used a Xerox daisy wheel which made the printed output equivalent to an IBM Selectric. BTW, I pitied the poor engineer who had to sit next to the printer because it was really loud when it was printing.
Raspberry Pi 4B
CPU cores = 4
CPU speed = 1.5 GHz
RAM = 4 GB
Storage = 32 GB
CPU cores = 1
CPU speed = 4 MHz
RAM = 64 KB max addressable at one time
Storage = 40 MB
Pi 4 computer compared to Intel 8080 computer:
CPU 375 times as fast
RAM 62,000 times as much
Storage 800 times as much
To make the increase in hardware performance easier to understand, there has been a corresponding decrease in software efficiency.timrowledge wrote: ↑Thu Aug 01, 2019 6:21 pmModern systems are so much faster that simply offering scaling factors doesn't really give any feel for it to most people.