ronr@sphinx.UChicago.UUCP (Ron Rusnak) (05/23/86)
The SCSI rom code in the Mac+ uses a process called pseudo dma to send and retrieve bytes from the NCR 5380 chip. That process depends on the pulsing of the DACK input signal. Does anyone know where that signal is generated? From looking at the code I suspect it is address line A9, however ......... Also I noticed that the board has the EOP input signal connected. Any ideas on what generates that one? I tried tracking them down on the board but got lost under the BMU1 chip. ron rusnak - !ihnp4!gargoyle!sphinx!ronr