collapseos/blk/311

( Low-level part of ROLL. Example:
  "1 2 3 4 4 (roll)" --> "1 3 4 4". No sanity checks, never
  call with 0. )
CODE (roll)
    HL POPqq,
    B H LDrr,
    C L LDrr,
    SP ADDHLss,
    HL INCss,
    D H LDrr,
    E L LDrr,
    HL DECss,
    HL DECss,
    LDDR,
;CODE
Copy boot.z80 to blkfs 2020-04-23 11:19:12 +10:00			`( Low-level part of ROLL. Example:`
			`"1 2 3 4 4 (roll)" --> "1 3 4 4". No sanity checks, never`
			`call with 0. )`
			`CODE (roll)`
			`HL POPqq,`
			`B H LDrr,`
			`C L LDrr,`
			`SP ADDHLss,`
			`HL INCss,`
			`D H LDrr,`
			`E L LDrr,`
			`HL DECss,`
			`HL DECss,`
			`LDDR,`
			`;CODE`
VE: add 't' This is the first commit I do entirely in VE. It's a habit I'm planning on taking as it helps a lot to find usability issues. 2020-06-12 08:12:01 +10:00