UltimateBasic 64 1.6.5

Ultimate Basic v1.6.5 – Release Notes

2026-10-17 – Release 1.6.5: 16-bit address expressions

Fixed

• An address made of a 16-bit constant plus a byte variable was
  computed in 8 bits: peek($07F8 + k) read $00F8 + k, and
  poke $07F8 + k, v wrote into zero page. Addresses are now 16-bit
  in peek, poke, peek16, poke16, fill, memcopy, drawmem, save and
  reu (also the fill / memcopy length, e.g. 40 * rows).
  constant + byte compiles to LDA / STA $07F8,Y.
• poke ptr + i, v with a word pointer adds in 16 bits.
• peek(k) with a byte variable returned k itself; it now reads
  memory at $00kk.
• poke16 addr, base + k wrote only the low byte of the value.