Atari TTM194
| Atari TTM194 | |
|---|---|
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|
| Atari's photograph from the 1991 TTM 194/195 data sheet | |
| Manufacturer | Moniterm Corporation, Minnetonka, for Atari Corporation[1] |
| Type | 19-inch ECL high-resolution monochrome monitor |
| Release date | Shown at CeBIT, Hannover, 21 March 1990[1] |
| Discontinued | About 1993[1] |
| Price | DM 2,198 (December 1990)[1] |
| Interface | ECL video on a 9-pin D-sub at the monitor, cabled to the TT's 15-pin high-density D connector[2] |
| Compatible | Atari TT030[2] |
| Dimensions | 368 × 452 × 381 mm (H × W × D)[2] |
| Weight | 16.4 kg[2] |
| Power | 220-240 V AC, 50 Hz, 64 W (European owner's manual)[2] |
| Resolution | 1280 × 960[2] |
The Atari TTM194 is a 19-inch fixed-frequency monochrome monitor for the Atari TT030's 1280 × 960 high-resolution mode. Atari's owner's manual describes it as an ECL high-resolution monitor for use with all Atari TT computers.[2] atari-computermuseum.de records that it was made by Moniterm and shown at CeBIT in March 1990, and that Atari sold it alongside the TTM195, a Philips-built equivalent.[1] The monitor contains a CRT and a mains power supply; read CRT Discharge Procedure before opening it.
History
[edit | edit source]The TT030's 1280 × 960 mode drives only an ECL monochrome monitor; VGA-type colour monitors use the same connector for the lower-resolution modes.[3] Atari showed the TTM194 at CeBIT in Hannover on 21 March 1990, and the TTM195 at the Fall COMDEX in Las Vegas on 12 November 1990. atari-computermuseum.de says the two were sold in parallel, the TTM194 mainly in the United States and the TTM195, made by Philips Korea and based on the Philips M19P114P/7103, mainly in Europe, though both turned up in both markets. It gives the TTM194's German price in December 1990 as DM 2,198 and the TTM195's US price in November 1990 as $995, and dates the end of production to about 1993.[1] Atari's August 1991 data sheet covers the two models together as the "TTM 194/195".[4] The TT030 field service manual names the TTM195 as the monochrome monitor for its test set-up.[3]
atari-computermuseum.de describes both monitors as technically close to the earlier Atari SM194, a Moniterm 19-inch monitor of 1989 for the TT030, and for the Mega ST and Mega STE with a graphics card.[1]
Specifications
[edit | edit source]| Item | Owner's manual (TTM194, 1990) | Data sheet (TTM 194/195, August 1991) |
|---|---|---|
| Picture tube | 19 in, black and white, 114° deflection | 19 in, P104 white phosphor, anti-glare |
| Resolution | 1280 × 960 lines minimum at 10 ft-L (P104 phosphor, 48 % anti-glare faceplate) | 1280 × 960, non-interlaced |
| Active display area | 360 × 270 mm ± 2 mm | About 36 × 27 cm |
| Video input | ECL; rise and fall 3.5 ns maximum (10-90 %) | ECL single-bit 100K, 75 Ω |
| Scan rates | Horizontal blanking 3.98 µs minimum, scan delay adjustable 0-4 µs; vertical blanking 55.62 µs minimum | About 72 kHz horizontal, about 72 Hz vertical |
| Mains | 220-240 V AC, 50 Hz; 64 W; inrush 40 A peak at 240 V | 90-264 V without switching, under 100 W |
| Controls | Brightness, contrast, power switch and power light at the front | On/off and brightness |
| Dimensions (H × W × D) | 368 × 452 × 381 mm | 470 × 420 × 400 mm, with swivel base |
| Weight | 16.4 kg | Under 18 kg |
The two documents disagree on the mains range, the controls, the size and the weight. The owner's manual is the European (UK) edition for the TTM194 alone; the data sheet covers the TTM194 and TTM195 together, and atari-computermuseum.de lists the scan rates as 71.911 kHz and 71.624 Hz with a video bandwidth of 128.85 MHz.[2][4][1]
Connecting
[edit | edit source]Switch everything off, connect the monitor's signal cable (9-pin D-sub) to the TT's 15-pin monitor connector, then connect the mains. Switch the monitor on first and the TT second.[2] The UK edition of the manual asks for a 3 A fuse in a BS1363 plug, or a 3 A or 5 A fuse with any other plug.[2]
| Monitor 9-pin (female) | Signal | TT 15-pin HD (male) | TT030 pin function |
|---|---|---|---|
| 1 | ECL video | 4 | High resolution monochrome out + |
| 2 | ECL video return (ground) | 5 | Ground |
| 3 | H sync | 13 | Hsync |
| 4 | V sync | 14 | Vsync |
| 5 | Not connected | ||
| 6 | XECL (inverted) video | 15 | High resolution monochrome out - |
| 7 | XECL video return (ground) | 10 | Ground |
| 8 | Sync return (ground) | 10 | Ground |
| 9 | Monitor detect (ground) | 9 | Monochrome detect |
The manual specifies twisted pairs: 1-2 and 6-7 at 75 Ω (28 AWG), 3-8 and 4-9 at 100 Ω.[2] Pin 9 is grounded in the monitor, and the TT reads it on the MFP's XMONO input to know that a monochrome monitor is connected.[2][3]
Faults and repair
[edit | edit source]| Symptom | Cause and action |
|---|---|
| Monochrome monitor does not sync, although a colour monitor works on the same TT | Atari's TT030 symptom checklist: check that the monochrome detect line is not open with the monitor connected, check the connection at the monitor connector, check the MFP's XMONO pin, and replace the MFP.[3] Check the cable continuity against the table above, especially 9-pin pin 9 to 15-pin pin 9. |
| Image too dark or washed out | Set the brightness and contrast controls at the front.[2] |
| Occasional snapping on switching on or off | Normal according to Atari. Continuous or frequent snapping or popping while running needs service.[2] |
No TTM194 service manual or schematic is held by the Internet Archive; its only TTM194 document is the owner's manual. The nearest circuit-level document is the February 1991 technical manual for the Atari SM194, which describes Moniterm's VCX series of monitors, buildable for any horizontal rate from 32 to 128 kHz. Its power consumption (64 W), video rise and fall time (3.5 ns) and horizontal scan delay (0-4 µs) match the TTM194 owner's manual. Its inrush figures (40 A at 120 V, 60 A at 220 V) differ from the TTM194's 40 A at 240 V, and its values are given for the SM194's 66 kHz timing, so use it as a guide to the TTM194, not as its service manual.[5][2]
A 2001 post on the classiccmp mailing list from someone who had repaired a batch of surplus Moniterm 19-inch monitors reported that most needed their first-stage video amplifier transistors replaced and a general alignment, and that those monitors set their fixed scan frequency with DIP switches.[6] The post is about Moniterm 19-inch monitors in general, not the TTM194 in particular.
Documentation
[edit | edit source]- Atari TTM194 Documentation: the owner's manual and the 1991 data sheet.
- Atari TTM194 Owner's Manual (C301836-003 Rev. A, 1990)
- Atari TT030 Computer Field Service Manual: the TT's monitor connector and the monochrome sync fault.
Gallery
[edit | edit source]-
Atari Computer GmbH data sheet for the TTM 194/195, August 1991
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Related pages
[edit | edit source]References
[edit | edit source]- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "Atari SM194 High-Resolution Monochrome Monitor" and "Atari TTM194 / TTM195 High-Resolution Monochrome Monitor", in "Atari ST Peripheriegeräte", atari-computermuseum.de: makers, first showings, markets, prices, scan rates and end of production. atari-computermuseum.de. Secondary source.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 Atari Corporation, Atari TTM194 High Resolution Monochrome Monitor Owner's Manual, C301836-003 Rev. A, 1990: introduction and power connection (p. 1); connecting and operating (pp. 2-3); safeguards and service (pp. 4-6); specifications (p. 7); 9-pin to 15-pin cable pinout and twisted pairs (p. 8). Hosted as File:Atari TTM194 Owner's Manual C301836-003.pdf.
- ↑ 3.0 3.1 3.2 3.3 3.4 Atari Corporation, Atari TT030 Computer Field Service Manual, C302483-001, August 1991: section 2.1, display modes and monitor interfaces (p. 5, PDF p. 12); section 2.3.1, monitor connector pinout (p. 14, PDF p. 21); section 3.1.2, test equipment (p. 29, PDF p. 36); symptom checklist, "Monochrome monitor fails to sync but color monitor does" (p. 72, PDF p. 79). Hosted as Atari TT030 Computer Field Service Manual.
- ↑ 4.0 4.1 4.2 Atari Computer GmbH, Atari TTM 194/195 data sheet, "Stand 8/91" (August 1991). File:Atari TTM 194-195 data sheet (Atari Computer GmbH, 1991).jpg.
- ↑ Atari, SM194 Technical Manual, February 1991: scope, general description and electrical characteristics including power and inrush (sections 1 to 3, PDF p. 3); display performance, rise and fall time and horizontal scan delay (section 4, PDF p. 5). Hosted as File:Atari SM194 Technical Manual (February 1991).pdf and described on Atari SM194 Documentation.
- ↑ Post replying to Douglas Quebbeman, "A2024/Viking Moniterm", classiccmp mailing list, 9 February 2001. classiccmp.org. Community repair report.