ZN wrote > The big omission on the ROM slot is a 'write' signal. Clever hardware can > be used to 'remember' the state of the lower 8 address lines when a read is > done from an area (obviously at least 256 bytes in size) set aside - the > read data is normally ignored, as the purpose was only to capture the state > of the address lines and later use them as data - then this data is written > somewhere by the hardware. The most notable example of this is Romdisq, > although other hardware used the same trick (there was a Kempston printer > interface, I think, that used this, as well as the original Miracle hard > disk).
Please stop this thread! Nearly clever enough hardware nearly works nearly all the time with nearly impossible software driving me nearly mad. Just reminding me of it gives me nightmares. Tony Tebby
