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Analog Devices 218x.

Assembler code
ROM:0034 ; --------------------------------------------------------------------------- ROM:0034 ROM:0034 loc_34: ; CODE XREF: TIMER+CF↓j ROM:0034 ar = $37 ROM:0035 dm(byte_1003F4F) = ar ROM:0036 jump loc_25C3 ROM:0037 ; --------------------------------------------------------------------------- ROM:0037 imask = $240 ROM:0038 ROM:0038 loc_38: ; CODE XREF: TIMER+12↓j ROM:0038 ar = dm(byte_1003E33) ROM:0039 ar = ar - 1 ROM:003A if lt jump loc_38 ROM:003B imask = $250 ROM:003C ROM:003C loc_3C: ; CODE XREF: TIMER+16↓j ROM:003C ar = dm(byte_1003E33) ROM:003D ar = ar - 2 ROM:003E if lt jump loc_3C ROM:003F imask = $269 ROM:0040 ROM:0040 loc_40: ; CODE XREF: TIMER+1A↓j ROM:0040 ar = dm(byte_1003F12) ROM:0041 ar = ar + 0 ROM:0042 if eq jump loc_40 ROM:0043 jump loc_6E ROM:0044 ; --------------------------------------------------------------------------- ROM:0044 ROM:0044 loc_44: ; CODE XREF: TIMER+2F↓j ROM:0044 ; TIMER+38↓j ... ROM:0044 ena timer ROM:0045 ay0 = dm(byte_1002CD2) ROM:0046 ax0 = dm(byte_1002CD3) ROM:0047 ar = ay0 - ax0 ROM:0048 if ge jump loc_4B
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