Video Ram And Hd46505 Crtc - Sanyo MBC-550 Series User Manual

Video RAM and HD46505 CRTC
The MBC 550 series computer allows any section of the
256K byte area to be converted into Video RAM. Allo­
cation is effected by the following method:
(1) Select a 16K byte page (usually page 1)
using the page selector (at I/O address XMO1).
(2)
Determine a display address by CRTC.
Relations between CPU addresses and pages:
5-38