RIRicoElectrico·Nov 29, 2024Submission
em400 – MERA 400 (Polish minicomputer) emulator
4 points · Open discussionjakubfi
em400
C2024–2024
jakubfi / em400
em400
MERA 400 emulator
2Distinct people
2Mentions
0Explicit recommenders
89GitHub stars
What to know before exploring
What it is
MERA 400 emulator
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 5:04:57 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by week2 dated mentions
Observed mentions: 2024-07-25 23:12:11 UTC to 2024-11-29 20:37:47 UTC. Weeks start Monday, UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| Jul 22 | 2024-07-22 00:00:00 UTC | 2024-07-29 00:00:00 UTC | 1 | 0 | 1 |
| Jul 29 | 2024-07-29 00:00:00 UTC | 2024-08-05 00:00:00 UTC | 0 | 0 | 0 |
| Aug 5 | 2024-08-05 00:00:00 UTC | 2024-08-12 00:00:00 UTC | 0 | 0 | 0 |
| Aug 12 | 2024-08-12 00:00:00 UTC | 2024-08-19 00:00:00 UTC | 0 | 0 | 0 |
| Aug 19 | 2024-08-19 00:00:00 UTC | 2024-08-26 00:00:00 UTC | 0 | 0 | 0 |
| Aug 26 | 2024-08-26 00:00:00 UTC | 2024-09-02 00:00:00 UTC | 0 | 0 | 0 |
| Sep 2 | 2024-09-02 00:00:00 UTC | 2024-09-09 00:00:00 UTC | 0 | 0 | 0 |
| Sep 9 | 2024-09-09 00:00:00 UTC | 2024-09-16 00:00:00 UTC | 0 | 0 | 0 |
| Sep 16 | 2024-09-16 00:00:00 UTC | 2024-09-23 00:00:00 UTC | 0 | 0 | 0 |
| Sep 23 | 2024-09-23 00:00:00 UTC | 2024-09-30 00:00:00 UTC | 0 | 0 | 0 |
| Sep 30 | 2024-09-30 00:00:00 UTC | 2024-10-07 00:00:00 UTC | 0 | 0 | 0 |
| Oct 7 | 2024-10-07 00:00:00 UTC | 2024-10-14 00:00:00 UTC | 0 | 0 | 0 |
| Oct 14 | 2024-10-14 00:00:00 UTC | 2024-10-21 00:00:00 UTC | 0 | 0 | 0 |
| Oct 21 | 2024-10-21 00:00:00 UTC | 2024-10-28 00:00:00 UTC | 0 | 0 | 0 |
| Oct 28 | 2024-10-28 00:00:00 UTC | 2024-11-04 00:00:00 UTC | 0 | 0 | 0 |
| Nov 4 | 2024-11-04 00:00:00 UTC | 2024-11-11 00:00:00 UTC | 0 | 0 | 0 |
| Nov 11 | 2024-11-11 00:00:00 UTC | 2024-11-18 00:00:00 UTC | 0 | 0 | 0 |
| Nov 18 | 2024-11-18 00:00:00 UTC | 2024-11-25 00:00:00 UTC | 0 | 0 | 0 |
| Nov 25 | 2024-11-25 00:00:00 UTC | 2024-12-02 00:00:00 UTC | 1 | 1 | 0 |
What Hacker News says
2 sourcesOfficials weren't keen on these bespoke machines because there was a Comecon push to standardize on unified system based on IBM 360, with compatible peripherals manufactured in many Eastern bloc countries: https://en.wikipedia.org/wiki/ES_EVM
K-202 was later developed into MERA 400, which was somewhat more successful. https://mera400-pl.translate.goog/Strona_g%C5%82%C3%B3wna?_x...
One of interesting things from modern perspective is that these machines didn't have synchronous clocks, but cycles were timed by RC delay circuits which were tuned differently for various groups of instructions. One notable operating system developed for it was CROOK, which was significantly more unixy compared to other contemporary mainframe based systems.
There's modern emulator for it https://github.com/jakubfi/em400, and they have excellent YouTube channel
Read the rest
(in Polish though): https://www.youtube.com/@MERA400/videos