Page 15
ever the computer is stopped. The output latch is displayed only while the AUX-Right switch is held
down – normal display is restored as soon as the switch is released.
The output latch feature is controlled by VDIP #1, bit 6. A value of 1 turns on the output latch, a value of
0 turns off the output latch.
Auto-Repeat Single Step
The 8800b provides an auto-repeat single step feature when the SINGLE-STEP switch is held down. This
same feature can be enabled on the 8800c Front Panel board. The lower three bits of VDIP #1 specify
the approximate auto-repeat rate in steps per second. A value of zero disables the auto-repeat feature.
Code Snippet Injection
A number of code snippets can be injected into RAM by entering the octal identifier for the desired code
snippet on switches A7-A0 (see below) and then depressing AUX-Left. After injection, an “examine” of
the start address is automatically performed, so simply depressing run starts the loaded code.
The code injection feature is enabled by VDIP #1, bit 5. A value of 1 enables code injection, a value of 0
disables code injection.
Bootstrap Loaders for BASIC
BASIC 1.0
000
2SIO
002
SIO
003
ACR
4K BASIC 3.2
004
2SIO
006
SIO
007
ACR
8K BASIC 3.2
010
2SIO
012
SIO
013
ACR
4K BASIC 4.0
014
2SIO
016
SIO
017
ACR
8K BASIC 4.0
020
2SIO
022
SIO
023
ACR
Extended BASIC 4.0
024
2SIO
026
SIO
027
ACR
Other Routines
ACR Leader Detector
030
For BASIC 3.2
031
For BASIC 4.0
Port Echo Routines
034
2SIO (1
st
port)
035
2SIO (2
nd
port)
036
SIO
037
ACR (SIO at 6/7)
Miscellaneous
040
Kill the Bit
041
Pong
044*
Intel Hex Loader 2SIO (1
st
port)
045*
Intel Hex Loader 2SIO (2
nd
port)
046
Memory Test (2SIO console)
*Relocatable – Set switches A15-A8 to the MSB of the desired load address before depressing AUX-Left
