# IEC 821:1991 — Withdrawn and superseded ISO standards

For IEC 821:1991, item title is IEC 821 VMEbus — Microprocessor system bus for 1 byte to 4 byte data; status code is 9599; successor is IEC 60821:1991; withdrawn / published date is 1991-12-26, recorded from its source on 2026-08-05.

- **Identifier:** IEC 821:1991 _(verified: appears in the quote below)_
- **Item title:** IEC 821 VMEbus — Microprocessor system bus for 1 byte to 4 byte data _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** IEC 60821:1991
- **Withdrawn / published date:** 1991-12-26 _(verified: appears in the quote below)_

## What the source says

> 5175,IS,,IEC 821:1991,IEC 821 VMEbus — Microprocessor system bus for 1 byte to 4 byte data,Bus CEI 821 VMEbus — Bus système à microprocesseurs pour données de 1 octet à 4 octets,1991-12-26,2,['35.160'],ISO/IEC JTC 1/SC 25,9599,[5174],[81997],"['en','fr']",561,

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).