Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
login
jfengel
on July 13, 2022
|
parent
|
context
|
favorite
| on:
CP/M is really open-source now
Plus an RS-232 for your modem and an IEEE 488 for your printer.
That CPU lacked a multiply instruction, so you had to implement that yourself.
veltas
on July 13, 2022
[–]
The multiply instructions on later CPUs were implemented as microcode programs on the silicon, so sometimes it was faster to write your own or a specialised routine anyway.
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
That CPU lacked a multiply instruction, so you had to implement that yourself.