Tandy 1400LT - IV-6. Memory Map and Organization

IV-6. MEMORY MAP
Figure 4-7 Memory-Map shows the location on the board of the IC and the corresponding memory Column-Address
Strobe
( CASO , CASl , CAS2 )
-~~
FFFFFH
FCOOOH
DCOOOH
COOOOH
BCOOOH
BBOOOH
AOOOOH
7FFFFH
40000H
OOOOOH
IPL
, ROMBIOS
(40000H -9FFFFH and DCOOOH -FBFFFH addresses are enabled or disabled by DIP switch (DS1)).
-
CAS2 SIGNAL
RAM
( IC301 , IC303 )
( DIP SWITCH SELECT )
EXPANSION ROM AREA
NOT USED
VIDEO
RAM
NOT USED
RAM
( IC301 , IC303
RAM
( IC300 . IC302
RAM ( IC43 , IC44 )
Figure 4-7. Memory-Map
Figure 4-9 shows the switch settings and description.
-
CAS2 SIGNAL
-
CASl SIGNAL
-
CASO SIGNAL
Function Description
InternaVExternal use Internal use
address 4000:0-9000:FFFF External use
sw 2 InternaVExternal use Internal use
Figure 4-8. DIP-SW Location
Figure
4-9. DIP-SW
4-7