Product data

HD404818 Series
96
Notes on ROM Out
Please pay attention to the following items regarding ROM out.
On ROM out, fill the ROM area indicated below with 1s to create the same data size as an 8-kword version
(HD404818 and HD40L4818). An 8-kword data size is required to change ROM data to mask
manufacturing data since the program used is for an 8-kword version.
This limitation applies when using an EPROM or a data base.
Vector address
Zero-page
subroutine
(64 words)
Pattern & program
(2,048 words)
Not used
Vector address
Zero-page
subroutine
(64 words)
Pattern
(4,096 words)
Not used
ROM 2-kword version:
HD404812, HD40L4812
Address $0800–$1FFF
ROM 6-kword version:
HD404816, HD40L4816
Address $1800–$1FFF
$0000
$000F
$0010
$003F
$0040
$07FF
$0800
$0000
$000F
$0010
$003F
$0040
$17FF
$1800
$1FFF
Fill this area with 1s
Vector address
Zero-page
subroutine
(64 words)
Pattern & program
(4,096 words)
Not used
ROM 4-kword version:
HD404814, HD40L4814
Address $1000–$1FFF
$0000
$000F
$0010
$003F
$0040
$0FFF
$1000
$1FFF
Program
(6,144 words)
$0FFF
$1000