On Thu, 9 Oct 2003 23:27:41 +0100, "Adrian Brown" <[EMAIL PROTECTED]> wrote:
> Ok, Someone might know (Colin?). What happens (is it even possible), if > a piece of hardware on the euroconnector attempts to tap into a read on > the normal memory address lines and send its own data, do the address > lines get setup when it tries to read from normal memory ranges? > If I have read the schematic correctly : The internal mem chips have their o/p passed through 470R resistors before reaching the Z80 and the connector. So as long as it is normal memory being read then any external device should be able to override the memory data. If it is a read of the ROM then you need to assert ROMCSL & ROMCSRL to turn off the ROM. Dunno if you could do that fast enough to be effective within one read cycle though. I'm sure some one will be along in a moment to prove me wrong. Nev -- Nev - please note that mail to address nevilley@ will now go into a spam bucket because of excessive mail abuse. Please use one of the new addresses.
