CRTC (Motorola 6845 compatible)
E532269
The CRTC (Motorola 6845 compatible) is a programmable CRT controller chip widely used in 8-bit and early 16-bit computers to generate video timings and manage text and graphics display output.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
CRT controller chip
ⓘ
video display controller ⓘ |
| accesses | video RAM ⓘ |
| category | display hardware component ⓘ |
| communicatesVia | I/O registers ⓘ |
| communicatesWith | system CPU ⓘ |
| compatibleWith | Motorola 6845 NERFINISHED ⓘ |
| controls |
CRT raster scanning
ⓘ
display enable timing ⓘ horizontal sync timing ⓘ vertical sync timing ⓘ |
| era | late 1970s and 1980s home and personal computers ⓘ |
| function |
generate video timing signals
ⓘ
manage graphics display output ⓘ manage text display output ⓘ |
| hasFeature |
cursor control
ⓘ
hardware scrolling via start address changes ⓘ programmable character cell size ⓘ programmable registers ⓘ programmable screen resolution parameters ⓘ start address register for display memory ⓘ |
| hasRegister |
cursor end register
ⓘ
cursor position registers ⓘ cursor start register ⓘ horizontal displayed register ⓘ horizontal total register ⓘ start address high register ⓘ start address low register ⓘ vertical displayed register ⓘ vertical total register ⓘ |
| hasSignal |
HSYNC output
ⓘ
VSYNC output ⓘ address outputs for video memory ⓘ display enable output ⓘ |
| influencedBy |
Motorola 6845 register set
NERFINISHED
ⓘ
Motorola 6845 timing model ⓘ |
| outputTo |
CRT monitor interface circuitry
ⓘ
digital video signals ⓘ |
| requires |
external character generator ROM for text mode
ⓘ
external video shift register or logic for pixel serialization ⓘ |
| roleInSystem |
address generator for video memory scanning
ⓘ
timing generator for video subsystem ⓘ |
| supports |
character-based display organization
ⓘ
multiple rows and columns of text ⓘ |
| usedFor |
low-resolution graphics modes
ⓘ
text mode displays ⓘ |
| usedIn |
8-bit computers
ⓘ
early 16-bit computers ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.