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Apple One Replica

nick123 over 9 years ago

Hello,

I was watching Ben Heck's Apple one replica Videos earlier, and he was talking about "Bank 0, and Bank 1" I didn't quite understand what that meant.

Could I get some help?

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clem57 over 9 years ago +1

In the early days, memory addressing was limited to 16 bits or 64 K. To store more, they would have a bank 0 and 1 switch at same address by processor command to effectively increase memory by 8 K typically…

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clem57 over 9 years ago

In the early days, memory addressing was limited to 16 bits or 64 K. To store more, they would have a bank 0 and 1 switch at same address by processor command to effectively increase memory by 8 K typically.
Clem
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nick123 over 9 years ago in reply to clem57

Ok, then how does the computer access the ROM?, I thought bank 0 was RAM, and bank 1 was ROM.
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nick123 over 9 years ago in reply to clem57

Ok, then how does the computer access the ROM?, I thought bank 0 was RAM, and bank 1 was ROM.
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clem57 over 9 years ago in reply to nick123

Usually both are RAM!
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nick123 over 9 years ago in reply to clem57

Ok, than how is the ROM accessed?
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clem57 over 9 years ago in reply to nick123

Usually ROM is located in a special memory location where the processor goes after a reset or power on. The code tests memory and sets up keyboard, mouse and display. If anything goes wrong, the number of beeps on speaker signal what hardware failed.
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