Date   : Thu, 16 Mar 2006 00:25:53 -0000
From   : "Mark Usher" <mu.list@...>
Subject: Re: Web site: Mainly Master 512

> CLC
> LDY #255
> TYA
> .loop
> ADC addr-1,Y
> DEY
> BNE loop
> 
> for both sectors.

The Acorn Superform program actually does it like this for the two sectors.

 4040P%=buffer%+1000
 4050[ OPT2
 4060CLC:LDY#&FF:TYA
 4070.L1% ADC buffer%+255,Y
 4080DEY:BNE L1%
 4090TAX:DEY:CLC:TYA
 4100.L2% ADC buffer%-1,Y
 4110DEY:BNE L2%
 4120STX buffer%+511
 4130STA buffer%+255
 4140RTS
 4150]
 4160CALL buffer%+1000