Read Sharp ER-A850 (serv.man16) Technical Bulletin online
CHANGE TO THE BIOS ROM
[Event report]
1. Model name:
ER-A850/A880
2. General:
A possibility has been identified, that a chip set problem could exist, the refresh stops
temporarily allowing the cache of the interrupt vector table area of the main memory, which
locks up the machine when executing a program. This is a countermeasure against it.
3. Description:
The machine locks up when starting after switching on and corrupts the data on the RAM disk.
(The frequency is once a week approximately.)
4. Cause:
Permitting to cache the interrupt vector table area of the main memory sometimes stops the
refresh for a long time, which corrupts the RAM disk data.
5. Action:
The cache presetting in the ROM or the driver has been changed as follows:
CPU ADDRESS 0A0000H~0DFFFFH: CACHE OFF AREA
CPU ADDRESS 000000H~001000H: CACHE OFF AREA
OTHER CPU ADDRESSES: CACHE ON AREA
1) The changed BIOS ROM has changed the ROM version as follows.
(Before changing) (Changed)
VHI27010RAN1C
→
VHI27010RAN1D
2) A change to the driver has made, the latest versions are as follows.
POSIOF.SYS V1.04
POSIOT.SYS V1.17
((For the field))
(1) Use the latest driver (POSIOF.SYS V1.04 or POSIOT.SYS V1.17).
(The drivers later than POSIOF.SYS V1.04 or POSIOT.SYS V1.17 will have the improved
cache incorporated.)
Exchange the ROM for one of the above new versions at repair, or exchange of the main
PWB.
1/2
Date :
Model :
Ref :
Colour Code :
Page 1
1st September 1996
ERA850
A850-011
White
ELECTRONIC CASH REGISTER
TECHNICAL BULLETIN
Sharp Electronics (UK) Ltd, Technical Support Group
2/2
above new ROMs.
((For production))
From June 1996 Production
6. Parts change:
Ref
No.
No.
Model
name
name
Version
P/G No.
Current parts
New parts
Parts name
Effec-
tive
time
tive
time
Inter-
change-
ability
change-
ability
Note
Parts code
Parts code
Price
rank
1
ER-A850
ER-A880
ER-A880
All
5 - 33
VHI27010RAN1C
VHI27010RAN1D
BC
ROM
Jun. ’96
3
—
<Interchange>
1. Interchangeable.
4. Not interchangeable.
2. Current type can be used in place of new type.
New type cannot be used in place of current type.
5. Interchangeable if replaced with same types of
related parts in use.
3. Current type cannot be used in place of new type.
New type can be used in place of current type.
6. Others.
Parts marked with " ! " is important for maintaining the safety of the set.
Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.
Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.
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