According to the datasheet, the HD6345 is upward-compatible with the HD6845S in pin and software. And it brings these new features:
*Screen Partition (horizontally split into 4 screens)with paging and scrolling for each screen*Smooth Scrollingin the vertical direction*External Synchronizationin Master-Slave or TV Syne modes*Interrupt requestby vertical blanking or light pen strobe detection*Double-size vertical display by Raster Interpolation
*Sync Position Adjustment
*Light Pen Raster Address
*Second Hardware Cursor
*Display Memory Width Setting
*Up to 256 Rows Maxcharacter rows per field*Programmable Timing Signal for dual-port RAM in MPRAMmode
*Three-state Control of MA/RA Output