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B-24 Diagnostic ROM Listings
HP 82718A
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*NOTE:
this does does not write or read
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to system ram/rom (0-64K nonswitched).
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It tests the entire address space
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when in switch mode.
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note that the start address (512K-ramsiz)
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HAS to he a integer multiple of ramsiz
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for the test to stop.
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this test depends on the the fact
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that there are 64 ram chips on
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4 MEMIC chips (64 bits=8 hytes)
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ADDRESS LINES
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* t e s t the
address
lines
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*alg
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fill first 8K ram chip with zero
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addr<-0
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loop
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M(addr)<-PE
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for 0=0 to 8K
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if o=addr then
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if M(o)<>PF then error
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"address lines BAD;
addr,o"
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else
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if M(o)<>0 then error
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"address lines BAD: addr,o"
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next o'
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M(addr)<-0
{ reset ram }
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i f addr=0 then addr<-1
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else addr<-addr+addr
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while addr<>8K
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done
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*Note: I assume that the last live MEMIC chip
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(ie the one selected) has ram on it.
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