Diamond Speedstar24 configuration. \ VOGONS

Diamond Speedstar24 configuration.

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First post, by Baoran

Posted on 2017-05-02, 10:39

Baoran Offline

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I have a Diamond Speedstar24 ISA graphics card with Tseng Labs chip that has 4 dip switches in the back. It also has 2 jumpers. One of the jumpers is labeled as IRQ2 so that is self explanatory and then there is 3 way jumper that is labeled as JP1.
Anyone has any idea what the JP1 jumper does and how to configure the 4 switches at back of the card?
If there is a manual for the card somewhere online, that would help too.

Reply 1 of 3, by CkRtech

Posted on 2017-05-02, 10:55

CkRtech Offline

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Posted by a guy on experts-exchange from about 16 years ago -

JP1: ZERO WAIT STATE
ON (default) = ZERO WAIT STATES
OFF = No ZERO WAIT STATES

JP3: Set IRQ2 Interrupt
ON (default) = IRQ2 ENABLED
OFF = IRQ2 DISABLED

JP4: 8/16 bit BIOS ACCESS
ON (default) = 16 bit BIOS ACCESS
OFF = 8 bit BIOS ACCESS

DIP SWITCH SETTINGS:

800 x 600 Mode Setting

SW1 SW2 Monitor Retrace Timings
-----------------------------------
ON* ON* Vert. 56 Hz non-interlace, Horiz. 35.1
ON OFF Vert. 72 Hz non-interlace, Horiz. 48.1
OFF ON Vert. 60 Hz non-interlace, Horiz. 37.8

1024 x 768 Mode Setting

SW3 SW4 Monitor Retrace Timings
----------------------------------
ON* ON* Vert. 43 Hz interlace, Horiz. 35.5
ON OFF Vert. 70 Hz non-interlace, Horiz. 56.5
OFF ON Vert. 60 Hz non-interlace, Horiz. 48.3
OFF OFF Vert. 72 Hz non-interlace, Horiz. 58.1

Switch 5 ALTERNATE TIMING SWITCH
ON* Normal Timing
OFF Alternate Timing

* - DEFAULT

Reply 2 of 3, by Baoran

Posted on 2017-05-02, 10:59

Baoran Offline

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Location: Finland

That seems like a different card because my JP1 is a 3 way jumper, JP4 does not exist on my card and I also don't have 5th switch

Reply 3 of 3, by Baoran

Posted on 2017-05-02, 11:45

Baoran Offline

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Posts: 2206
Joined: 2017-04-01, 08:39
Location: Finland

Mine looks like the card in the pictures on this page: http://www.vgamuseum.info/index.php/component … -tseng-et4000ax

Only Differences are that the bios version number is different and ramdac chip is different. Jumpers and switches are the same. You can see the irq2 jumper in the bottom right corner and JP1 3 way jumper below the ramdac chip.

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