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Can I use HIGH in a simple relocatable expression?

Hi Everyone,

I am trying to get the following to assemble, but the assembler gives me error A20:-

defins_XSEG	segment xdata
		rseg    defins_XSEG

rx_buff:	ds	200h
tx_buff:	ds	200h

rx_msb EQU	HIGH rx_buff
rx_lsb EQU	LOW  rx_buff
tx_msb EQU	HIGH tx_buff
tx_lsb EQU	LOW  tx_buff


Can HIGH (and LOW) be used here or have I lost my mind and missed the obvious?

Many Thanks
Alex F.

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