Description
Ensoniq 4001022851 Rev B ISA Sound Card OTTO Soundscape MIDI Joystick DB-15 1992
The Ensoniq 4001022851 is a full-length 16-bit ISA sound card built around Ensoniq's early OTTO audio processor, a proprietary chip Ensoniq developed for its Soundscape family. The OTTO chip integrated FM synthesis and digital audio playback in a single controller, giving this card a sound architecture distinct from the dominant Sound Blaster line of the same era. This example is Revision B, dated 1992, with assembly number 10900228.
Specifications & What's Included
- Part Number: 4001022851, Rev B
- Assembly Number: 10900228
- Bus Interface: 16-bit ISA
- Main Chipset: Ensoniq OTTO (MX chip marked 135090T601 / 18851A, © Ensoniq 1992)
- Form Factor: Full-length ISA card
- Bracket Connectors: DB-15 MIDI / Joystick port; 3× 3.5mm audio jacks (Line Out, Line In, Mic)
- Year: 1992
- Card only — no driver software, cables, or accessories included
Applications
Ensoniq entered the PC sound card market in the early 1990s with the Soundscape series, targeting buyers who wanted an alternative to Creative Labs' Sound Blaster with a higher-quality audio engine. The OTTO chip at the heart of this card combined wavetable-style synthesis with digital audio (PCM) playback, which set it apart from the OPL2/OPL3 FM-only synthesis used in many competing cards of that period. These cards were designed for DOS and early Windows 3.x / Windows 95 PCs with ISA slots, used for gaming, MIDI composition, and general multimedia. The DB-15 port served double duty as both a MIDI interface (with the appropriate adapter cable) and a standard PC joystick port — a common design on mid-1990s ISA audio cards. Today, Ensoniq ISA sound cards are sought by vintage PC enthusiasts building period-correct DOS gaming or MIDI workstation machines, where the OTTO chip's sound signature is valued alongside contemporaries like the ESS 688 and Crystal CS4236 families.
This Ensoniq 4001022851 Rev B ISA sound card has been inspected and appears to be in good used condition. The PCB is clean with no visible cracked traces, burned components, or obvious physical damage. The bracket shows light surface wear consistent with prior installation. The DB-15 MIDI/joystick port and 3.5mm audio jacks appear intact. It has not been powered up or tested at our facility, but it was pulled from a working environment where it was previously in use. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Ensoniq |
Model: |
4001022851 |
MPN: |
4001022851 |
Type: |
ISA Sound Card |
SKU: |
33577 |
Hardware Revision: |
Rev B |
Chipset: |
Ensoniq OTTO (135090T601 / 18851A) |
Bus Interface: |
ISA (16-bit) |
Form Factor: |
Full-Length ISA Card |
Audio Ports: |
3× 3.5mm jacks (Line Out, Line In, Mic) |
Game/MIDI Port: |
DB-15 MIDI / Joystick Port |
Compatible With: |
ISA-equipped PCs, vintage DOS/Windows systems |
Year / Era: |
1992 |
Country/Region of Manufacture: |
United States |
Seller Notes: |
Card only; no software, cables, or accessories included |
Condition Notes: |
This Ensoniq 4001022851 Rev B ISA sound card is in good used condition. PCB is clean with no visible damage; bracket shows light wear. Not tested at our facility but pulled from a working environment. Please contact us with any questions. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |
