== Upper ROM Bank ==
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Works like the [[Upper ROM Bank]] register on CPCs. The number is looked up banks used for the Aleste BIOS are: 00h BASIC (bytes in 4000h..7FFFh in D62 and converted into another number which is the 16K page index Aleste's 64K EPROM) 03h BOOTMENU (bytes in C000h..FFFFh in the Aleste's internal 64k ROM64K EPROM) 07h AMSDOS (bytes in 8000h..BFFFh in the Aleste's 64K EPROM)All other values 01h..02h, 04h..06h, 08h..FFh do select BASIC, too.
== Ext Port ==