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Laser Magnetic Storage International

Laser Magnetic Storage International (LMSI) was a subsidiary of Philips that designed and manufactured optical and magnetic media. It began as a joint venture between Philips and Control Data Corporation. It later became Philips LMS.

Products

LMSI developed a proprietary CD-ROM interface. Early iterations relied on many 7400-series chips&nbsp;– on the CM 153 card for example. Later on, this bus was based on the highly integrated NCR chip&nbsp;– <code>NCR © DIGBIE LMS 97644845-00 0390471</code> on the CM 260 for example.

External CD-ROMs, LMSI interface:
  • CDD 401: 1× speed (rebranded CM 221)
  • CDD 461: 1× speed
  • CDD 462: 1× speed (same as CDD 461 but with multi-session support)
  • CM 50: 1× speed
  • CM 100: 1× speed&nbsp;– the world's first CD-ROM drive
  • CM 121: 1× speed
  • CM 221: 1× speed
  • CM 225: ?× speed
External CD-ROMs, SCSI interface:
  • CDD 521: 2× speed
  • CDD 522: 2× speed
  • CDD 552: ?× speed
  • CDD 2000: 4× speed
  • CDD 2600: 6× read, 2x write
  • CM 110: ?× speed
  • CM 231: 1× speed
  • CM 234: ?× speed
Internal CD-ROMs, LMSI interface:
  • CM 201: 1× speed
  • CM 205: 1× speed
  • CM 206: 2× speed
  • CM 210: ?× speed
Internal CD-ROMs, SCSI interface:
  • CM 121: 1× speed
  • CM 201: 1× speed
  • CM 204: ?× speed
  • CM 212: ?× speed
  • CM 214: ?× speed
  • PCA80SC: 8× speed
Internal CD-ROMs, IDE interface:
  • CDD 3610: 6× speed
  • CDD 3801: 32× speed
  • CDD 4201: ?× speed
  • CDD 4401: ?× speed
  • CDD 4801: ?× speed
  • CM 202: 2× speed
  • CM 207: ?× speed
  • CM 208: ?× speed
  • CM 218: ?× speed
ISA LMSI controller cards:
  • CM 153: 8-bit ISA (coupled with the CM 100 and the CM 201)
  • CM 155: 8-bit ISA (coupled with the CM 100, the CM 201 and the CM 210)
  • CM 50 interface: 8-bit ISA (coupled with the CM 50)
  • CM 250: 8-bit ISA (coupled with the CM 205)
  • CM 260: 16-bit ISA (coupled with the CM 206)
Motherboard-integrated
  • Certain Tandy Sensation models featured a LMSI controller PCB connected to the motherboard.
  • The proprietary 16-pin LMSI CD-ROM interface was relatively short lived and existed on LMSI interface cards and a few ISA sound cards. These sound cards only have internal LMSI connectors, not the external DB-15 connector for external LMSI devices (the DB-15 on sound cards is the game port/UART MPU-401):
  • Sound Blaster Pro 2 CT1620
  • Sound Blaster 16 ASP CSP CT1780
  • Media Vision Jazz 16 LMSI
  • Pro Audio Spectrum LMSI
  • Pro Audio 16 LMSI
  • Generic 16-bit ISA cards with the Aztech AZTPR16 DSP (FCC ID 138-MMSN808)
  • Magnetic products were geared towards corporate mini computer environments (like the IBM AS/400):
  • LD 510: internal SCSI MO drive
  • LD 520: external MO drive
  • LD 1200: external WORM drive
  • LD 4100: cartridge optical storage
  • LD 6100: external WORM drive
  • LF 4500: cartridge optical storage

References