Re: apple II roms and eproms

["Igor" <ikanja@despam....com>]

Roger Johnstone wrote:

> 
> A 2764 EPROM has 13 address lines numbered A0 through A12. A 27128
> has one extra address line (A13). Your EPROM programmer only controls
> the A0 to A12. If you plug in a 27128 and pull A13 low by connecting
> it to 0V you can read and write the first half of it by just
> pretending it's a 2764. Now connect A13 to +5V and you can use the
> upper half of the EPROM.

oh, now I understand! Definitely, I want to try.
Then I'll have to find a way to break the binary files I want to load
into 8k pieces (and to put pieces together).
Thanks,


Igor