Southwest Specialty Products 6800 manual Compatibility, Loading Binary Tapes Thru Swtbug

OPERATING THE MP-A PROCESSOR BOARD

AT BAUD RATES HIGHER THAN 1200 BAUD

When using the MP-S serial interface with an MP-A processor board, baud rate clocks for up to 9600 baud are available from the baud rate generator on the MP-A processor board. The table below shows the baud rates available and from which pin of IC4 on the MP-A board they are derived. These 16X baud rate clocks are best feed back to the interface boards via the user defined lines provided on the mother board. These baud rates of course are in addition to the 110, 150, 300, 600 and 1200 baud rate clocks already provided on the mother board.

BAUD RATE	MP-A IC4 pin
75	9
200	6
1800	15
2400	3
3600	16
4800	2
7200	17
9600	1

COMPATIBILITY

Although SWTBUG® has been written to be as compatible as possible with MIKBUG® and with software supplied by SWTPC, it can never be completely MIKBUG® compatible. All major subroutines of SWTBUG® are address and function compatible with MIKBUG®, but if you have a program that enters into the middle of a MIKBUG® routine for some reason, program modifications will be necessary. The following is a list of the MIKBUG® compatible subroutines and strings along with their entry point addresses.

E040	LOAD19	E0C8	OUT4HS
E047	BADDR	E0CA	OUT2HS
E055	BYTE	E0D0	START
E075	OUTCH	E0E3	CONTRL
E078	INCH	E19C	MCLOFF
E07B	PDATA2	E19D	MCL
E07E	PDATA1	E1AC	INEEE
E0BF	OUT2H	E1D1	OUTEEE

If any doubt exists as to the compatibility of a particular program, it should be disassembled and any references to memory locations E000–E1FF be verified. Since SWTBUG® is more complex than MIKBUG, more RAM area must be used in the 6810 SWTBUG® RAM. If vectored software interrupts and breakpoints are not being used, the area from A014 to A033 and from A04A to A07F can be used for small, temporary programs such as memory diagnostics. Note that some programs written for MIKBUG® use locations A034-A036 - these locations are not available for use in SWTBUG®

LOADING BINARY TAPES THRU SWTBUG®

SWTBUG® was written to accept the binary formatted tapes supplied by SWTPC. These tapes include 4K BASIC, 8K BASIC, CORES and DESEMBLER. When loading these tapes the following rules must be followed:

1.) The tape reading device (AC-30, etc.) must be locked in the read on mode during the binary load.

2.) Binary tapes must be loaded in thru port # 1, the control port. The optional load from port 0 command is not supported in binary. You may load in ASCII however.

3.) When using a PIA type interface to load binary tapes, the unused lines used for reader/punch on/off strobing are not activated.

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