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Dell - ARC 8088 Motherboard

ARC 8088 Motherboard

Specifications


Microprocessor

 Microprocessor type

 8088

 Clock speed

 4.77/8 MHz

 Math coprocessor

 8087

 Math coprocessor speed

 6 MHz


Memory 

 Installed RAM
 640 KB
 RAM access speed
 150 ns
 RAM division option
 256 KB or 640 KB

Drive Bays 

 Visible
 4 half-height

Expansion Slots 

 8-bit
 8

Electrical 

 Voltage (user-selectable)
 110 V/220 V at 50/60 Hz
 Power supply
 150 W

Jumpers/Switches/Controls

SW1

00000001.gif 
Switch    Position        Function
00000002.gif 
1         Off             Reserved
00000003.gif 
2         Off             8087-2 installed             
                                                       

          On              NO 8087-2 installed
00000004.gif 
3         Off             Reserved
00000005.gif 
4         Off             Reserved
00000006.gif 
5&6    Off/Off         Mono video card              
                                                       

5&6    On/Off          CGA                          
                                                       

5&6    On/On           EGA

Diskette Drive Configuration

00000007.gif 
           S7     S8
00000008.gif 
1 drive    On     On     
                         

2 drives   Off    On     
                         

3 drives   On     Off    
                         

4 drives   Off    Off

Tech Notes

Dell System Analyzer

The Dell System Analyzer is not supported in any Turbo system. It was not ever shipped with a Turbo system. Attempting to use it may cause unpredictable results.

101-Key Keyboard

Does not support a 101-key keyboard.

Switching Speed

Keyboard method: <CTRL-ALT><->

NOTE: The LED on the chassis front indicates if the system is in Turbo mode. There are no beeps or other signals aside from a noticeable increase in speed.

RLL Drives

Are supported on Turbos, not on 286/386s.

3.5-Inch Diskette Drives

Not supported.

Memory

Chips

The memory sold in this system is 640 KB. It had a 150-ns access chip speed.

Amount

There are 2 switch banks located to the right of the memory banks that would change the amount of base memory on the system. The switches in both banks would either be "Even OFF/Odd ON" or "Even ON/Odd OFF." If the even switches were on, the system would have 256 KB of memory; if all the odd switches were on, it would have 640 KB of memory. (See Layout for exact position of switches.)

Removal

Even if the base memory was changed to 256 KB, the memory chips had to remain in the sockets to complete the circuit.
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