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Stubs in just enough of the 5380 to get a Mac Plus too boot.

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This commit is contained in:
Thomas Harte
2019-08-11 20:55:20 -04:00
parent 949c1e1668
commit a90a74a512
3 changed files with 122 additions and 53 deletions
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Components/5380/ncr5380.cpp
+69
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@@ -8,11 +8,80 @@
#include "ncr5380.hpp"
#include "../../Outputs/Log.hpp"
using namespace NCR::NCR5380;
void NCR5380::write(int address, uint8_t value) {
switch(address & 7) {
case 0:
LOG("[SCSI] Set current SCSI bus state to " << PADHEX(2) << value);
break;
case 1:
LOG("[SCSI] Initiator command register set: " << PADHEX(2) << value);
break;
case 2:
LOG("[SCSI] Set mode: " << PADHEX(2) << value);
mode_ = value;
break;
case 3:
LOG("[SCSI] Set target command: " << PADHEX(2) << value);
break;
case 4:
LOG("[SCSI] Set select enabled: " << PADHEX(2) << value);
break;
case 5:
LOG("[SCSI] Start DMA send: " << PADHEX(2) << value);
break;
case 6:
LOG("[SCSI] Start DMA target receive: " << PADHEX(2) << value);
break;
case 7:
LOG("[SCSI] Start DMA initiator receive: " << PADHEX(2) << value);
break;
}
}
uint8_t NCR5380::read(int address) {
switch(address & 7) {
case 0:
LOG("[SCSI] Get current SCSI bus state");
return 0xff;
case 1:
LOG("[SCSI] Initiator command register get");
return 0xff;
case 2:
LOG("[SCSI] Get mode");
return mode_;
case 3:
LOG("[SCSI] Get target command");
return 0xff;
case 4:
LOG("[SCSI] Get current bus state");
return 0xff;
case 5:
LOG("[SCSI] Get bus and status");
return 0x03;
case 6:
LOG("[SCSI] Get input data");
return 0xff;
case 7:
LOG("[SCSI] Reset parity/interrupt");
return 0xff;
}
return 0;
}