Hi Tom,
maybe because that's a *really* undocumented input bit ?
The RBIL documents it. PORTS.A, table 393 says about bit 4: toggles with each refresh request.
I searched right now, but couldn't find it anywhere. so let me ask: what kind of 'refresh' is that ?
DRAM refresh.
does this work on compaq/dell/../tandy TRS-1000 as well ?
I don't know, but the RBIL says it exists on PC, XT and newer (see port 0060-006F, line 7001).
anyway, I'd go with eric and say that beeping shouldn't be spaceship engineering. so take the BIOS 55 ms timer ...
For the beep, you're right. In case someone needs finer reslution, refresh toggle bit can be used.
Regards, Lucho
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