Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Calculator | CPU | RAM | Display Size | Programming Languages | Link Abilities | Year Released | Predecessors | Successors |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| TI-73/TI-73 Explorer | Zilog Z80 @ 6 MHz | 25 KB of RAM, 512KB of Flash ROM | 96×64 pixels 16×8 characters | TI-BASIC , Assembly (via Mallard), Flash Apps | I/O Port | 1998/2003 | TI-80 | None |
| TI-82 | Zilog Z80 @ 6 MHz | 28 KB of RAM | 96×64 pixels 16×8 characters | TI-BASIC, Assembly (through modifications) | I/O Port | 1993 | TI-81 | TI-83 |
| TI-83 | Zilog Z80 @ 6 MHz | 32 KB of RAM | 96×64 pixels 16×8 characters | TI-BASIC, Assembly (built-in) | I/O Port | 1996 | TI-82 | TI-83 Plus |
| TI-85 | Zilog Z80 @ 6 MHz | 28 KB of RAM | 128×64 pixels 21×8 characters | TI-BASIC, Assembly (through modifications) | I/O Port | 1992 | None | TI-86 |
| TI-86 | Zilog Z80 @ 6 MHz | 128 KiB of RAM | 128×64 pixels 21×8 characters | TI-BASIC, Assembly (built-in) | I/O Port | 1997 | TI-85 | None |
| TI-92/TI-92 II | Motorola 68000 @ 10 MHz | 68 KB of RAM/136 KB of RAM | 240×128 pixels (not broken into character blocks) | TI-BASIC, Assembly (through modifications) | I/O Port | 1995/1996 | None | TI-89 , TI-92 Plus |
Question:
what is the cpu for the calculator with 28 kb of ram and display size 128×64 pixels 21×8 characters?
Answer:
Zilog Z80 @ 6 MHz