ID #3862

Commodore: 1084 (and variants) / 1084S (and variants)

Connection: DB9, Video Sockel (Amiga 23pin)

1084S, Front View
1084S, Front View

1084s (black), Front View
1084s (black), Front View

1084ST, Front view
1084ST, Front view

1084ST, Rear view
1084ST, Rear view

1084ST, Side view
1084ST, Side view

1084ST,  Ports
1084ST, Ports

1084s-D1, Front View
1084s-D1, Front View

1084s-D1, Rear View
1084s-D1, Rear View

1084S-P Rear view - 2716K
1084S-P Front view - 2600K
Hi Res Version, 1084s (black), Front View - 735K
1084S-P Connectors - 2395K
Hi Res Version, 1084ST, Front view - 56K
Hi Res Version, 1084ST, Rear view - 81K
Hi Res Version, 1084ST, Side view - 86K
Hi Res Version, 1084s-D1, Front View - 142K
Hi Res Version, 1084ST, Ports - 73K
Hi Res Version, 1084s-D1, Rear View - 155K


Picture Tube: 14 inch (13 inch viewiable), slotted triplet pitch 0.42 mm
Deflection: 90 degrees
Resolution: 640x256, 640x512 (interlaced)
Raster Frequency: 50 Hz
Line frequency: 15625 Hz
Character Field: RGB
2000 characters 80x25 rows
Composite Separated LCA
1000 characters 40x25 rows
VIDEO (Composite Video): 0,7V P-P, 75 ohm plus sync. 0,3V P
VIDEO (Luminance Signal): 1,0V P-P, 75 ohm
CHROMA (Chroma Signal): 1,0V P-P, 75 ohm
9-pin D: RGB Analog 0,7V P-P, 75 ohm
Sound output: 1,0W RMS/channel, 5% distortion
Audio input signal: 177 mV, 10K ohm
Mains voltage: 220-240V AC+/-10%, %0 Hz
Power consumption: 60W typical
Dimensions: (HxWxD) 355x360x365 mm
Weight: 12,5 kg


Picture Tube: 14 inch (13 inch viewable), slotted triplet pitch 0.42 mm
Deflection: 90°
Monitor input sockets for RGB signals:
9-pin D: RGB Analog 0.7 P-P, 75 Ohm
DIN connector: RGBI Digital TTL Levels
Resolution: 640 x 200 lines, 640 x 400 lines interlaced
Characters: RGB, RGBI, 2000 characters, Composite, Seperated LCA, 1000 characters
Raster Frequency: 50 or 60Hz
Line Frequency: 15625 - 15750Hz
Sound Output: 1WRMS
Audio Signal: 1.0V P-P, 47K Ohm
Mains Voltage: 120 VAC, 60Hz
Power Consumption: 75W
Dimensions (H x W x D): 330 x 357 x 378 mm
Weight: 11 kg

Looking at the back of the monitor

             Digital         Analog
Pin Number TTL Mode RGB Analog Mode

1 Ground Ground
2 Ground Ground
3 Red Red
4 Green Green
5 Blue Blue
6 Intensity N/C
7 N/C Composite Sync
8 Horiz.Sync N/C
9 Vert. Sync N/C

1084 Sub-Models

The 1084 and its variants (1084S, 1084ST, 1084S-P, 1084-P, 1084S-P2, 1084-D, 1084S-D) are all 15.75 kHz monitors. They do not handle AGA "double" screenmodes, nor will they display the deinterlaced output from the A2320 Amber board or the motherboard deinterlaced output on an A3000. However, they will show all normal 15.75 kHz displays, and many (most? all?) of the 1084 versions have a separate input for composite video.

The 1084 is a usually a variation of the Philips CM8833 monitor; the 1084S-D was made by Daewoo (as was the 1084D, probably). The display tubes used in these monitors were made by Orion, Toshiba, Hitachi, and Samsung.

At one time or another, every possible permutation of connectors and video capabilities on the 1084 seems to have been reached, so don't be surprised if your 1084 has some bizarre combination of connectors and specifications.

Common Problems

  • The door covering the front-panel controls is typically broken off.    
  • The attached cables or connectors on some models tended to fail, causing loss of color or other problems. Resolder the pins. You can glue connectors in place to provide support.
  • Failed or insufficient insulation may cause arcing.
  • The power switch may partially fail, causing separate parts of the monitor to power down.
  • A phone caller suggested that internal connectors could tarnish with age, and disconnecting and cleaning them may help clear up some problems.
  • Repeatedly blown fuses can indicate a bad power supply.
  • A loud whistling noise indicates a bad flyback transformer (also known as an LOPT). Some 1084 monitors also have digital RGB (PC clone CGA) inputs, and there was such a profusion of minor or major variations that any 1084 might have any combination of analog RGB, digital RGB, and composite inputs.
Other Notes

The 2080 is a long-persistance phosphor, .39 mm dot pitch.


  Sync Frequency 15.75 kHz (NTSC; 15.6 kHz PAL)

Pin-Outs (Analog RGB, 6-Pin DIN)

  Pin 1: Green
  Pin 2: Horizontal Sync
  Pin 3: Ground
  Pin 4: Red
  Pin 5: Blue
  Pin 6: Vertical Sync

Pin-Outs (Digital RGBI, 8-Pin DIN)

  Pin 1: Unused
  Pin 2: Red
  Pin 3: Green
  Pin 4: Blue
  Pin 5: Intensity
  Pin 6: Ground
  Pin 7: Horizontal Sync
  Pin 8: Vertical Sync

Pin-Outs (1084S DB9)

  Pin 1: Ground
  Pin 2: Ground
  Pin 3: Red
  Pin 4: Green
  Pin 5: Blue
  Pin 6: Unused
  Pin 7: Composite Sync
  Pin 8: Horizontal Sync
  Pin 9: Vertical Sync

Contributions to this page by:
Bojster, Greg Scott (National Amiga), Iggy Drougge, NicDouille, Olivier Croquette, RiWa & Friends, Severino Calleja, Warren Block

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Last update: 2009-01-26 20:29
Revision: 1.0

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