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A002 à 01 MOST SIGNIFICANT BYTE OF LOWER ADDRESS
A003 à 23 LEAST SIGNIFICANT BYTE OF LOWER ADDRESS
A004 à 45 MOST SIGNIFICANT BYTE OF UPPER ADDRESS
A005 à 67 LEAST SIGNIFICANT BYTE OF LOWER ADDRESS
Typing P would turn the punch on and output the specified memory data. A sample punch
output is as follows:
$M A002
$A002 02 01 MSB OF LOW ADDRESS
$A003 72 00 LSB OF LOW ADDRESS
$A004 EF 01 MSB OF HIGH ADDRESS
$A005 00 20 LSB OF HIGH ADDRESS
$A006 5F
$P TAPE PUNCH COMMAND
S11301008E1000CE12348600C6FF3FE0E3DD005DB2
S11301108090E05160F73A8201F500FFC79771D1F2
S104012000DA
$
S1 13 0100 8E1000CE12348600C6FF3FE0E3DD005D B2
START OF
BLOCK
CHARACTER
BYTE
COUNT
(HEX)
BLOCK
STARTING
ADDRESS
DATA CHECK
SUM
The S1 at the start of the block is used to tell the load routine that valid punch data follows.
Each punch block must begin with the S1. The 13
16
is the number of bytes that follow in the block.
In this case two bytes are required for the starting address of the block (01 and 00), 10
16
bytes
are required for the data (8E 10 00 CE 12 34 86 00 C6 FF 3F E0 E3 DD 00 50) and one byte is
required for the checksum (B2). The checksum is generated by adding the complement of the
start of block address and the data, 8 bits at a time. At load-in time another checksum is
generated by the load routine which must match with the one generated at punch time.
As the punch begins a PUNCH ON (12
16
) control character will be output to the punch
device. If a MP-C control interface is the selected interface unused lines on the PIA will be
strobed to turn on the punch function of a SWTPC AC-30 or equivalent tape interface. (See the
PIA Strobing section for more information.) When the punch is completed a PUNCH OFF (14
16
)
control character will be output and another PIA line will be strobed. User control is then returned
to SWTBUG. To complete the tape making procedure you will have to enter the end of tape
command described below.
END OF TAPE COMMAND E
The E command will punch the contents of the program counter (A048-A049) and an S9 to
tape. The S9 is decoded by the load routine as an “end of tape” marker. For example, if you wish
to save a program that resides from 0000 to 000F and whose starting address is 0005 you would
perform the following sequence:
$M A002
$A002 FC 00
$A003 3E 00
$A004 A0 00
$A005 49 0F
$A006 4C