

>>>>>>>>  TEST6046


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TARGET
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This is 32 KB sized code to go into ROM U18 (which is 32 KB sized) on an IBM 5160 (IBM XT) motherboard.

If your IBM 5160 motherboard is a 64-256KB type, the TMM23256/MK37000/MK38000 ROM's can in most cases be replaced with 27C256 EPROM's,
but some brands of 27C256 may be unsuitable for the 64-256KB motherboard - see http://www.minuszerodegrees.net/5160/motherboard/5160_u18_u19_sockets.htm
     
If your IBM 5160 motherboard is a 256-640KB type, then you can use a 27C256 (or 27256) EPROM, or a Winbond W27E257.
      
For the IBM 5160, use EPROM's that are rated at 250 ns, or faster.
See http://www.minuszerodegrees.net/5160/motherboard/IBM%205160%20motherboard%20-%20ROM%20description%20from%20TR.png


The code also suits XT clones that have a single 32 KB sized BIOS ROM (e.g. 27256 or 27C256).
If the XT clone has instead, a single 8 KB sized BIOS ROM (e.g. 2764 or 27C64), then use the 8 KB sized ROM images at http://www.minuszerodegrees.net/5150/code/IBM%205150%20-%20Some%20test%20code%20for%20U33.htm


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REQUIRED
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1. A speaker attached to your IBM 5160 motherboard.

2. A way of putting TEST6046_32KB_SIZED.BIN into a suitable ROM/EPROM/EEPROM.


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WHAT DOES THE CODE DO ?
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Sets up the 8253 and 8255 chips in a way that results in a continuous tone from the speaker.

The tone is about 900 Hz.


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WHAT YOU SHOULD OBSERVE
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A tone heard from the speaker, a tone that never ends.

A partial circuit diagram is in file: TEST6046 - Measurements.png

