Model 100 System Map Part 6 (6D3F-7FD6)
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| Model 100 System Map |
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ROM: Part VI
Copyright 1985
Revision Date: 09/30/85
Compiled and Researched by:
Robert D. Covington
Systems Information Management Consultants
[Not associated with The Covington Group, N. Y., N. Y.]
This document may be duplicated and distributed free of
charge to any individuals who desire it. Any duplications of
this document, however, must inluce all of the information
contained here-in, with no deletions or changes.
The author and distributors of this document make no
expressed or implied warrantees as to the validity of the
information contained here in.
6D3FH - Send a character to the printer
Entry:
A - Character to send
Exit:
C flag - Set if break key interrupt
6D6DH - Check RS232 queue for pending characters
Exit:
A - Number of characters pending
Z flag - Set if no characters pending
6D7EH - Get a character from the RS232 receive queue. If no
character is pending, wait for a character.
Exit:
A - Character received
Z flag - Set if no error
C flag - Set if break key interrupt
6DACH - RST 6.5 (RS232 Interrupt on received character) routine
6E0BH - Send XON (Control Q) out the RS232 if enabled by FF42H.
Exit:
A - Destroyed
6E1EH - Send XOFF (Control S) out the RS232 if enabled by FF42H.
Exit:
A - Destroyed
6E32H - Send a charcter out the RS232 (routine waits for character to
be transmitted).
Entry:
A - Character to send
Exit:
C flag - Set if shift break pressed
6E75H - Set the RS232 baud rate
Entry:
H - Baud rate code (1-9)
Exit:
A & DE - Destroyed
6E94H - Start of 18 byte RS232 baud rate timer values. Each 2 byte
entry corresponds to the baud rates 0-9. These values are
loaded into the 8155's timer to generate the baud rate for
the UART.
6EA5H - End of RS232 baud rate timer table.
6EA6H - Initialize RS232 or modem
Entry:
H - Baud rate code for RS232 (300 baud assumed for
modem).
L - Configuration code
Bit 0 - Number of stop bits (0=1, 1=2)
1 - Parity (0=odd, 1=even)
2 - Parity enable (0=enable)
3-4 - Word length (01=6, 10=7, 11=8)
C flag - Set if RS232, reset if modem
6ECBH - Deactivate RS232 or Modem
Exit:
A - Destroyed
6EE5H - Click sound port if sound is enabled
6EEFH - Check for carrier detect
Exit:
A - 0 if carrier detect, 0FFH if no CD
Z flag - Set if carrier detect
6F31H - Enable XON/XOFFs when control Ss and Qs are sent.
Exit:
A - Destroyed
6F46H - Write cassette header and sync byte
All registers destroyed
6F5BH - Write a character to cassette without checksum.
Entry:
A - Character to save
Exit:
All registers destroyed
6F85H - Read cassette header and sync byte
Exit:
C flag - Set if error, reset if header verified
All registers destroyed
6FDBH - Find the frequency of the cassette port. This routine
measures the duration from the start to the stop of half of
the wave presented on the cassette port. The result is the
number of 29 t-state cycles required to find the end of the
wave. The byte at FF8EH determines if the count will trigger
on a high or low pulse. For example, a 1200 hz signal, which
would take 416 ms to go through half of the wave, would cause
this routine to exit with a value aound 35. If the sound
option is turned on (see FF44H), this routine will click the
beeper on each call. Note: Although this routine analyses
the cassette port in 29 T-state intervals, the actual routine
requires much more time to execute.
Exit:
C - Number of 29 T-state cycles
A - Destroyed
C flag - Set if the routine was canceled by a shift break
702AH - Read a character from cassette without checksum.
Exit:
D - Character from cassette
C flag - Set if the routine was canceled by a shift break
All other registers destroyed
71F7H - POP AF, BC, DE, and HL off stack, enable interrupts and
return. This routine should only be used with a jump to
assure stack integrety. This routine makes a good interrupt
routine exit vector.
7242H - Scan keyboard for a possible character (Note: Shift Break is
converted to Control C)
Exit:
A - Character from keyboard
Z flag - Set if no key is found
C flag - Set if special function key
A Key
-----------------------
0-7 F1-F8
8 LABEL
9 PRINT
0AH SHIFT-PRINT
0BH PASTE
726AH - Enable interrupts as normal (nothing destroyed)
7270H - Check keyboard queue for pending characters
Exit:
A - Destroyed
Z flag - Set if charcter pending
C flag - Set if break is present
7283H - Check for break (Control C) or wait (Control S)
Exit:
A - Destroyed
C flag - Set if Control C or S
Z flag - Set if no control C or S
729FH - Check to see if SHIFT BREAK is being pressed.
Exit:
A - Destroyed
Z flag - Set if shift break is being pressed
C flag - Set if shift break is being pressed
72B1H - Scan BREAK, CAPS, NUM, CODE, GRAPH, CONTROL, and SHIFT key
column of keyboard. Reset the bit in the A register that
corresponds the key being pressed
Exit:
A - Each reset bit coresponds to a key being pressed
(BREAK=bit 7, CAPS=bit 5, etc.)
72C5H - Produce a tone through the internal transducer. The RS232
cannot be used along with this routine.
Entry:
DE - Frequency
B - Duration
Exit:
A - Destroyed
7329H - Load the contents of the clock chip registers into the
address pointed to by HL.
Entry:
HL - Start of receiving buffer for the contents of the
hardware clock chip
732AH - Update the clock chip internal registers with the time in the
buffer pointed to by HL
Entry:
HL - Start of the buffer containing the new values for
the clock chip
744CH - Plot point on screen
Entry:
D - X coordinate
E - Y coordinate
Exit:
All registers destroyed
744DH - Reset point on screen
Entry:
D - X coordinate
E - Y coordinate
Exit:
All registers destroyed
765CH - Set interrupt to 1DH
Exit:
A - Destroyed
7662H - Beep routine (07H)
Exit:
A & BC - Destroyed
7676H - Click sound port
Exit:
A - Destroyed
7711H - Start of LCD character generator shape table. Five bytes per
character for the first 128 characters. 6 bytes per
character for characters 128-255.
7BF0H - End of LCD character generator shape table.
7BF1H - Start of keyboard conversion matrix.
7D32H - End of keyboard conversion matrix.
7D33H - Boot routine
7EACH - Display the number of free memory bytes on the screen.
7FD6H - RST 38H RAM vector driver routine (see 38H).
