Olivetti M24 and ATT 6300

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Revision as of 22:45, 15 February 2022 by TiBo's Retro Computers (talk | contribs) (Generel description of the Olivetti M24 model)
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For more information, see this article's corresponding Wikipedia page: Olivetti M24.
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Olivetti M24 and ATT 6300
Preliminary Information
Release Year 1983
Leak Risk High
Batteries Yes, RTC known to leak
Mounting Technology Through Hole, Sockets
Capacitor Types Aluminum Electrolytic, Tantalum, Ceramic,
Destructive Entry No

Olivetti launched the M24 in 1983. This was based around the Intel 8086-2 which ran at a respectable 8 MHz.

On many levels the Olivetti computer was ahead of its time not only in the design but also in it's hardware.

Its graphics capability was to some extend at that time a bit odd, as it had an biuld-in enhanced CGA video card which in addition to the standard 320 x 200 also supported 640 x 400 x 2-colours. It did required a proprietary dual-sync monitor with a 25-pin D-sub connector.

The keyboard connector did also different from the IBM PC/XT, in that it used a 9-pin D-sub instead of a round DIN. But it was compatible with the later PS/2 pinouts. A Olivetti mouse could be plugged directly into the keyboard. The mouse could be configured to simulate the usage of the keyboard's arrow keys in DOS applications without mouse support. This is similar to how the Amstrad PC1512 mouse worked.

All M24s were bundled with MS-DOS 2.1 by Olivetti

Olivetti also licensed both Xerox and AT&T in US and Logabax in France to release the M24 under their respective brands, as the Xerox 6060, the AT&T PC 6300 and Persona 1600.

By 1986 the M24 was the #1 market leader in Europe, with approximately 300,000 M24s being sold that year. Due to this high level of sales, Olivetti was branded the third largest PC manufacturer in the world.

Fun facts

  • Internally the Olivetti M series was known as PC1050. A label you will see on all the motherboards and some of Olivetti's own expansion cards such as the CRT card
  • Having the Intel 8086-2 CPU running at 8/10 Mhz also made it the worlds first overclocked PC

Known Issues

Battery on Motherboard Leaks

Causes

  • RTC battery can leak and cause corrosive damage

Solutions

  • Remove battery and clean with baking soda

No Power

Causes

  • Pins soldered on the power supply board may be broken loose, especially for heavy parts like transformers or connectors like for the molex power cable.

Solutions

  • In a pinch, reflow the solder to reconnect it. But new solder should be added.
    • After reflowing parts could be glued down to help avoid it happening again

Original Parts

Power Supply

PCB is split but does not duplicate RefDes', C1050 AL191/1-B, COD 303603 P, P-P3, PSU Model 303219M

Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Lead Spacing Temp Type Brand Series
124, 134 2 680µF 200V Through Hole Radial 30mm 10mm 85C Aluminum Electrolytic Nichicon PS-M - Temp rating does not match series datasheet
132, 139 2 22µF 25V Through Hole Radial 5mm 85C Aluminum Electrolytic Nichicon SE-M - Cannot find this series
50, 62 2 100µF 25V Through Hole Radial 8mm 85C Aluminum Electrolytic Nichicon SE-M
83B 1 4.7µF 63V Through Hole Radial 5mm 85C Aluminum Electrolytic ? 0.03(M)

8410

Jacket is Yellow

74 1 470µF 16V Through Hole Radial 10mm 85C Aluminum Electrolytic Ace SE-M
69 1 1000µF 6.3V Through Hole Radial 10mm 85C Aluminum Electrolytic Ace SE-M
28 1 220µF 35V Through Hole Radial 10mm 85C Aluminum Electrolytic Ace SE-M
35 1 2200µF 10V Through Hole Radial 16mm 85C Aluminum Electrolytic Nichicon SE-M
65 1 1000µF 16V Through Hole Radial 10mm 85C Aluminum Electrolytic Ace SU
35B 1 2200µF 25V Through Hole Radial 16mm 85C Aluminum Electrolytic Nichicon SE-M
21 1 10,000µF 6.3V Through Hole Radial 18mm 85C Aluminum Electrolytic Nichicon SE-M
20 1 4700µF 16V Through Hole Radial 18mm 85C Aluminum Electrolytic Ace S

References