Toshiba MA-290-100 SERIES - Manual (Page 21)

To operate, enter the discount amount on the numeric keyboard, and
then depress the [DOLL DISC] key. It may be operated after a
[ST] key depression or any time during a sale before finalizing the
sale.
This key may be programmed with Amount Limit (max. 4-digit value), tax
status, validation compulsion, and manager intervention.
To override the programmed Amount Limit, the "MGR" position of the
Mode Lock is required, but the [LC OPEN] key will not be effective.
Quantity extension is not possible using the [DOLL DISC] key.
EX
TAX EXEMPT KEY [EX]
This key is used to declare the exemption of the taxes from the sale,
displaying the sale total excluding the exempted-tax, printing the
tax-exempted amount. Only a finalizing operation is possible after a
[EX] key depression.
The [ITEM CORR] key can not function to delete a [EX] key entry.
When multiple tax modifier keys are installed, partial tax exemption
as well as all tax exemption may be performed in the following ways:
[TXI/M] [ ex ] ............................. to exempt TAX 1 only
[TX2/M] -► [EX] ............................ to exempt TAX 2 only
[TX3/M] [ ex ] ............................. to exempt TAX 3 only
[TXl/M] [TX2/M] ♦ [EX] .................. to exempt TAX 1 and TAX 2
[TX2/M] [TX3/M] [EX] ................... to exempt TAX 2 and TAX 3
[TXl/M] [TX3/M] ♦ [EX] .................. to exempt TAX 1 and TAX 3
To exempt all the taxes, simply depress [EX] (or depress all the
tax modifier keys first, and then depress [EX]).
The [EX] key may be programmed to require the "MGR" position of the
Mode Lock.
PB+ PB-
PREVIODS BALANCE KEYS [PB+] [PB-]
These keys are used to enter a previous balance in a charge posting
operation. If a previous balance is entered, then the operation
becomes a charge posting operation, and the [Chg] key must used at the
end of the operation. (See the "REGISTER PROCEDURE FOR SALES" section
as to detail operations to follow the [Chg] key in charg posting.)
A previous balance may be entered anywhere and any number of times
during a sale. The [PB+] key is used to post a debit balance and the
[PB-] key is used to post a credit balance. To initiate a charge
posting operation where no previous balance exists, then enter "0"
(zero) as a past balance, followed by [PB+] or [PB-].
If the [TXBL TL] is depressed during a charge posting, the displayed
amount does not include the previous balance. When the [Chg 1 key is
depress to end the charge posting, the displayed and printed amount
includes the previous balance. However, a programmable option may be
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