On Fri, 19 Jul 2019 19:16:09 -0700, Tom Brennan wrote: >Simple: No > >Longer: I'll guess you're talking about clearing memory? I do seem to >remember writing code on a z80 to clear a section of bytes to zero, and >oops if I messed up it would keep writing zeros to 64K, wrap around to >zero, and then continue on until the zeros hit the instructions that >were being executed. Everything but parts of the loop code was gone, >and since x'00' is a z80 NOP, the processor would remain running - just >not really doing much of value. > >On 7/19/2019 3:16 PM, Lester, Bob wrote: >> >> Who remembers how to "ripple core" on a 360/75J? Back in the day, I >> was taught that it "wrote un-digit zeros" to all storage locations (main + >> LCS) on the box. If course, an IPL was required after this was done. >> >> Not sure how widely it was used. A simple yes or no is OK if you >> cannot provide details. 😊 >> In days of yore, was there a button on the console, perhaps white, recessed behind a plastic guard to do something like that?
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