

>>>>>>>>  TEST5065


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TARGET
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This is code to go into ROM U33 on an IBM 5150 (IBM PC) motherboard.
The IBM 5150 has special ROM requirements. See http://www.minuszerodegrees.net/5150/motherboard/5150_u33.htm


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REQUIRED
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1. A way of putting the BIN file into a suitable ROM/EPROM/EEPROM.
   The IBM 5150 has special ROM requirements. See http://www.minuszerodegrees.net/5150/motherboard/5150_u33.htm

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


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BIN FILES
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Per http://www.minuszerodegrees.net/5150/motherboard/5150_u33.htm, if a suitable adapter is used, 16 KB and 32 KB sized ROM/EPROM's can be used on the IBM 5150 motherboard.
Because of that, included here are 16 KB and 32 KB versions of TEST5065_8KB_SIZED.BIN, being TEST5065_16KB_SIZED.BIN and TEST5065_32KB_SIZED.BIN

TEST5065_8KB_SIZED.BIN is for an MCM68766 EPROM, or a 2564 EPROM.
TEST5065_32KB_SIZED.BIN is for a 27C256 EPROM (in a suitable adapter) or W27E257 EEPROM (in a suitable adapter).

Again, see http://www.minuszerodegrees.net/5150/motherboard/5150_u33.htm


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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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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 XA12 are toggling/pulsing.

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






