It monitors the - Z80 address and data buses and displays the current values on those buses on OLED displays.Designed by JACK in Taiwan
What is it? It monitors the - Z80 address and data buses and displays the current values on those buses on OLED displays. This allows you to, for example, see what IO ports are being read and writt...Read More…
It monitors the - Z80 address and data buses and displays the current values on those buses on OLED displays. This allows you to, for example, see what IO ports are being read and written, or what memory addresses are being written.
They chose was to add some configurable latching capability. I broke out the M1, MREQ, IOREQ, RD, and WR signals to a jumper so that those signals can be used to trigger the latch on the 74HC573. If you select M1, then in theory you should be able to see every instruction load address. If you select IOREQ then you should be able to see every IO request. Watching instruction loads at 7.3728Mhz is still not something the human eye can perceive, but io requests happen much less frequently and you can actually see stuff happen.
You have to be careful not to engage two jumpers at the same time . We use a NPN BJT circuit as a NOT function. The product needs to be assembled and soldered by yourself.
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Karl Albert | Feb. 13, 2020
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