200 lines
5.0 KiB
Groff
200 lines
5.0 KiB
Groff
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,m3 0
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____________
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/ /
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/ Section 9 /
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/___________/
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---------------
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OTHER COMMANDS:
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---------------
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From the XTRAS menu, there are three additional commands:
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RAM
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The number of bytes of memory left is displayed.
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NEW
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Clears memory so that you can begin with a clean slate.
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BOOT
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The computer will be rebooted from the drive that Quick-Draw Adventure
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Mapper was loaded from.
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_____________
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/ /
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/ Appendix I /
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/____________/
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-------------------------------
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SPECIFYING INTERFACE CARD DATA:
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-------------------------------
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If you have a printer interface card that is not currently supported,
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you have three options:
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[01]
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Buy a supported card. (Not a popular choice).
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[02]
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Write your own interface driver. (Explained in the next section).
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[03]
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Specify certain parameters about your interface. (Explained below).
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During configuration, select the "USER-SPECIFIED" option for your
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interface and answer affirmatively when asked if you want to specify
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your interface parameters.
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You need to know the following information which should be in the
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manual for your interface card:
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Data Address
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This is the address at which each byte must be stored in order to
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transmit it to the printer.
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Busy Address
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This is the address that contains the printer busy status.
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Busy Bit
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This is the bit number in the busy address that must be tested to
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determine if the printer is busy. The low order bit is 0 and and the
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high order bit is 7.
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Set/Reset
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Set means that if the bit is on, the printer is busy. Reset means
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that if the bit is off, the printer is busy.
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Strobe On Address
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This is an address that must be toggled after the data byte has been
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stored in order to transfer the data. It is not required on most
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interfaces.
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Strobe Off Address
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This address is required on some interfaces and must be toggled after
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the strobe on address.
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Addresses can be entered as decimal (default) or hexadecimal (preceded
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with a "$") values. You can enter absolute addresses set for a
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specific slot or make them adjust to the slot number (s) entered
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during configuration. After specifying each address, you will have to
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select one of five address modifications:
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- None
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- Slot *16
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- Slot *256
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- 2nd Slot *16
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- 2nd Slot *256
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----------------------------
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WRITING AN INTERFACE DRIVER:
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----------------------------
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If you can program in 6502 assembly language, you can write your own
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interface driver. The rules are very simple:
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1. Your routine must begin at $4300 and be no longer than $0100 (256)
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bytes.
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2. The printer drivers JSR to $4300 with the character to be output
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in the accumulator.
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3. Name your routine "USER-WRITTEN.IF" and select "USER-WRITTEN" from
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the interface menu during configuration.
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4. The printer slot # is stored at $CE. The 2nd slot value is stored
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at $CF.
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5. You can use the page zero locations between $90 and $9F.
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-------------------------
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WRITING A PRINTER DRIVER:
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-------------------------
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Writing a printer driver is considerably harder. The following
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requirements should be met:
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1. The driver must begin at $4000 and be no more than $300 (768)
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bytes long.
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2. To be general purpose, it should call an interface driver at $4300
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to output each character.
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3. Mapper calls 5 different subroutines:
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> JSR $4000 to perform a normal form feed operation on the printer.
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> JSR $4003 to output a normal text line. The data begins at $2C00.
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Output 80 bytes maximum or until a carriage return ($D) is found.
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> JSR $4006 to enter graphics mode. You can do whatever is required to
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init alize the printer. All subsequent calls will be to output graphic
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lines until a leave graphics mode call is made. The line spacing must
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be 7 "dots" high.
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> JSR $4009 to send a line of graphics data. The data is at $2A00 and
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consists of 480 bytes with each byte containing a column that is 7
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"dots" high and one "dot" wide. The high order bit is always off, the
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2nd highest is the top bit in the column, the low order bit is the
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bottom.
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> JSR $400C to leave graphics mode. You should do all of the
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"clean-up" that is required.
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1. You can use the space between $2000 and $27BF while in graphics
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mode. The contents will be indeterminate when graphics mode is entered
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and will be destroyed after graphics mode is exited. In between, it
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will be stable and survive between graphic line calls.
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2. Name your routine "USER-WRITTEN.PR" and select "USER-WRITTEN" from
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the printer selection menu during configuration.
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3. You can use the page zero locations between $80 and $8F.
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4. The graphics density value is stored at location $4B. A zero
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indicates single density, while a one means double density.
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