Table of Contents
Advertisement
8K MEMORY USERS GJIDE
ADDRESS RANGE
0000-IFFF
2000-3FFF
4000-5FFF
6000-7FFF
8000-9FFF
AOOO-BFFF
COOO-DFFF
EOOO-FFFF
TABLE 1
Page 4
SWITCH SETTING
(1 =ON)
OOOX
001X
OIOX
OllX
lOOX
101X
llOX
11IX
IF YOU HAVE 4K OR SMALLER BOARDS, THE MOST CONVENIENT ARRANGEMENT IS TO PUT THE
8K BOARDS AT THE I...CWEST ADDRESS FDLLCMED BY THE 4K AND SMALLER BOARDS.
IF YOU
HAVE MACHINE LAJ."IJGUAGE ROUTINES CN PRQI1S THAT USE THE STACK, A SMALL MEMORY BOARD
LOCATED JUST BELCM 32K IS VERY CONVENIENT.
THIS ALLCWS YOU TO ADD TO YOUR MAIN
MEMORY WITHOur HAVING TO REP:R:CX;RAM PROMS WITH THE NEW STACK LOCATION.
MEMORY WRITE PRarECT
THE RIGHT HAND DIP SWITCH CONTROLS THE MEMORY WRITE PROTECT.
WITH THE SWITCH
OFF, THE MEMORY CAN NOT BE WRITTEN INTO.
THE NOID1AL POSITION IS ON.
THIS
FEATURE IS IDl' USED WHEN RUNNING BASIC, Bur CAN BE USED 'ill PR0rECT SOURCE FILES
OR ASSEMBLERS WHEN DEBUGGING MACHINE CODE ROUTINES, WHICH OFTEN GO AWRY AND
CAUSE OI'HER PARTS OF ME,.1I1.0RY 'IO BE ALTERED.
'IO USE THE FEATURE, MERELY FLIP THE
PROTECT SWITCH J:lCMN BEFORE EXECtJrING THE MACHINE USAGE ROtJrINE.
NATURALLY, THE
STACK OR MEMORY LOCATIONS ALTERED CURING NORMAL PROGRAM EXECtJrION CAN IDI' RESIDE
CN PROI'ECTED BOARDS.
OtJrPUT DISABLE FEATURE
THERE IS CNE JUMPER LOCATION, AS SHCMN CN THE CCMroNENT PLACEMENT DIAGRAM, WHICH
PERMITS THE TRI-STATE BUS DRIVERS TO BE DISABLED DURING MEMORY READ CYCLES.
THIS PERMITS A TRANSPARENT BOOTSTRAP LOADER 'IO BE IMPLEMENTED USING COMPONENTS
ON ornER BOARDS.
WITH THE JUMPER INSTALLED, PULLING LINE 67 ON THE BUS LCW WILL
DISABLE '!HE TRI-STATE BUS DRIVERS.
MEMORY TEST PROGRAM
THERE ARE NUMEROUS MEMORY TEST PROGRAMS AVAILABLE IN THE LITERATURE FOR ANY
LEVEL OF SYSTEM SOPHISTICATION.
IF YOU HAVE 8K BASIC UP AND RUNNING, OR KNCM
SOMEONE WHO roES, '!HE FOLLCWING PROGRAM WILL ro A THOROUGH JOB OF TESTING YOUR
MEMORY WITH A RANDOM PATTERN USING THE RND FUNCTION.
TO USE THE PROGRAM, A
SYSTEM TN'"ITH AT LEAST 8K OF MEMORY IS REQUIRED, NOT COUNTING THE BOARD TO BE
TESTED.
SET THE BOARD ADDRESS 'IO SOME RANGE ABOVE THE EXISTING MEMORY Bur BELCW
32K.
LOAD Bi\SIC AND INITIALIZE MEMORY AT 8192 BYTES, SO BASIC WILL NOT LOAD A
PROGRAM IN THE BOARD TO BE TESTED.
LOAD THE TEST P:R:CX;RAM USING THE KEYBOARD,
PAPER TAPE, OR CASSETrE.
RUN THE PROGRAM AND ENTER THE STARTING AND ENDING
Advertisement
Table of Contents
