3 ms·
From memory. (The original) VAX 11/780 was a 1 MIPS machine. 32 Bit. pdp 11 was a slower machine. plus it was 16 bit. slow clock, a relatively cheap o'scope
by bdavis__ 4y ago
From memory.
(The original) VAX 11/780 was a 1 MIPS machine. 32 Bit.
pdp 11 was a slower machine. plus it was 16 bit. slow clock, a relatively cheap o'scope could be used to snoop the buses.
- zh3 4y agoIndeed, back in the day we bolted QBus backplanes to the side of DIN41612 backplanes and wire-wrapped across to a bunch of boards each with 100+ TTL chips on them (the 5V PSUs were something like 120A). The bus clocked at around a MHz, hence loosely the instruction rate (and back then, the addressed memory or peripheral needed to ack the bus cycle or there'd be a bus fault).
- timonoko 4y ago50 cent ESP-8266 would make excellent PDP-11. Except much too much memory. And 20 times too fast.
- dekhn 4y agohttps://www.espressif.com/en/news/news/ESP32-Powered_PDP-11 https://www.espressif.com/en/news/news/ESP32-Powered_PDP-11
- williamDafoe 4y agoThe original PDP-11/70 was 0.7 vax mips. So it was 70% as fast as a Vax 11/780. I believe (from memory) the Vax 11/780 could do ~1757 dhrystone 2.1 mips so a PDP-11/70 would be about 1230 dhrystone mips. https://wiki.cdot.senecacollege.ca/wiki/Dhrystone_howto https://wiki.cdot.senecacollege.ca/wiki/Dhrystone_howto