Model 100 System Map Part 6 (6D3F-7FD6)
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This is a derived work of the "Model 100 System Map", Copyright (C) 1985, Robert D. Covington, Systems Information Management Consultants.
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).