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SP (A008) Temporary storage location for the stack pointer. SP is used in the register
dump subroutines and by the breakpoint function.
PORADD (A00A) This location contains the port address used for SWTBUG’s I/O routines.
PORECH (A00C) This byte tells SWTBUG® ‘s input routines whether or not to echo.
XHI (A00D) Temporary index register storage used by numerous routines.
XLOW (A00E) Temporary index register storage used by numerous routines.
XTEMP (A010) Temporary index register storage for input and output routines.
SWIJMP (A012) When a SWI instruction is encountered, processor control will transfer to the
location stored in SWIJMP.
BKPT (AQ14) Temporary breakpoint address storage.
BKLST (A016) Temporary data storage for the breakpoint routine.
TW (A044) Temporary storage location for load/punch.
TEMP (A046) Temporary storage location for punch and load.
BYTECT (A047) Temporary storage location for load/punch.
SWTBUG® SUBROUTINE AND TEXT STRING DESCRIPTION
IRQV (E000) This is the entry point for regular IRQ interrupts. Processor control is given of
the service routine whose address is stored in IRQ.
JUMP (E005) This is the service routine for the J command. BADDR is used to input the
address and a jump then occurs to the correct address.
CURSOR (E009) Home-up and erase to end of frame characters for CT 1024.
LOAD (E00C) Load is the ASCII loading routine. Load uses a number of other SWTBUG®
subroutines.
BADDR (E047) BADDR is a subroutine to input a 4-digit hexadecimal number, such as 137D,
from the control terminal. BADDR uses the subroutines BYTE, INCH and
INHEX and uses temporary storage locations XHI, XLOW, CKSM, both
accumulators and the index register. When BADDR is called it will look for
four hex numbers to be entered from the terminal. If a non-hex value, such
as H, is entered, SWTBUG® control will resume. If all characters entered are
valid hex, the results will be stored in XHI, XLOW and the index register.
Accumulator A will contain of XLOW. If 137D is entered the results will be as
follows-
ACC A 7D
ACC B CKSM
IXR 137D
XHI 13
XLOW 7D
- CKSM and ACC B are used internally to generate a check sum for the
PUNCH routine.
BYTE (E055) BYTE is similar to BADDR, but inputs only two hex characters from the
terminal to generate one 8-bit byte equivalent. BYTE uses the subroutines