Display Control 1 Register
From SpecNext Wiki
| Number | TBRegisterNumber::$69 |
|---|---|
| Readable | TBRegisterReadable::Yes |
| Writable | TBRegisterWritable::Yes |
| Short Description | ShortDesc::Layer2, ULA shadow, Timex $FF port |
| Bit | Function |
|---|---|
| 7 | Enable the Layer 2 (alias for {{#ask:
PortNumber::$123B }} ($123B{{#ask: PortNumber::$123B |mainlabel=- |headers=hide |intro= / |?NumberDec#- }}) bit 1) |
| 6 | Enable ULA shadow (bank 7) display (alias for {{#ask:
PortNumber::$7FFD }} ($7FFD{{#ask: PortNumber::$7FFD |mainlabel=- |headers=hide |intro= / |?NumberDec#- }}) bit 3) |
| 5-0 | alias for {{#ask:
PortNumber::$xxFF }} ($xxFF{{#ask: PortNumber::$xxFF |mainlabel=- |headers=hide |intro= / |?NumberDec#- }}) bits 5:0 |
ULA shadow screen from Bank 7 has higher priority than Timex modes, setting bit 6 to "1" together with one of the extended Timex graphic modes will result into classic ZX128 ULA mode using Bank 7 data.