

>>>>>>>>  TEST6065


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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


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REQUIRED
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1. A way of putting TEST6065_32KB_SIZED.BIN into a suitable ROM/EPROM/EEPROM.

2. Logic probe (and the knowledge of how to use it).


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WHAT DOES THE CODE DO ?
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The code, in a loop:

Step 1:  Reads address 00000.
Step 2:  Reads address FFFFF.


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WHAT YOU SHOULD OBSERVE
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Reference diagram at https://minuszerodegrees.net/5160/misc/5160_address_bus.jpg

The intention is, for diagnostic purposes, to use this code together with a logic probe, the probe used to:
Step 1: Verify that the address bus lines of A0 to A19 are toggling/pulsing.
Step 2: Verify that the external address bus lines of XA0 to XA19 are toggling/pulsing.

( A good place to measure A19 to A0 of the address bus is an ISA expansion slot. )






