KrNews #06 15 ноября 1998

Программирование

AUTOCONF - AUTOCONFIG extended memory needed by all.

AutoConfig needed by all!


   (C) 1998 Viper / Techno Laboratory


   You've probably already noticed AutoConfig,
when charged with a newspaper ;-)

   AutoConfig - a small
subroutine, which determines what
memory pages from your computer
fast and which are slow and
distributing the pages in connection with
test results.

   Suppose your program
N pages using the 128th memory.
List of pages is organized in a table:


           DEFB 16,17,19,20,0

 where 0 - marker of the end of the table.


   Some pages require
high-performance, ie, we
that they were fast. As this
achieve?

   The following program
test all pages from the table and
arrange them by priority: the beginning
Tables will be quick page, then
slow. In your program in such a
case will spolzovatsya logical
Addressing pages - pages will have
non-physical (16, 17, 19 ...), but
LUNs (0, 1, 2, 3, 4 ...).
It is clear that the first logical
Pages will speed higher than that
the latter.

   Therefore, the first logical
page (0, 1) must be used
vremyakritichnyh for tasks such as:

   1) scrolling

   2) a large number of computations

   3) playing music

   4) Animation

   List goes on
infinity.

   It should be noted that the test will be
work properly and when the
TURBO mode.
 Q: What is it?
 A: This program is needed to
that your program worked just fine
used on most computers,
and not only on your! Otherwise, large
Diversity Spectrum-compatible machines,
methods to increase up to 128kb will
Besides that your program will be
reset or malfunction -
use such a program at
some (many) computers will be
impossible! For example, here are the results
Some research:


      with the help of this program:


           Pentagon (rulez!):

             Page: 0 - fast

             Page: 1 - fast

             Page: 3 - fast

             Page: 4 - fast

             Page: 6 - fast

             Page: 7 - fast


                 Profi:

             Page: 0 - fast

             Page: 1 - fast

             Page: 3 - fast

             Page: 4 - fast

             Page: 6 - fast

             Page: 7 - fast


               Krasnodar:


             Page: 0 - fast

             Page: 1 - fast

             Page: 3 - fast

             Page: 4 - slow

             Page: 6 - slow

             Page: 7 - slow


                Pulse:

             Page: 0 - fast

             Page: 1 - slow

             Page: 3 - slow

             Page: 4 - fast

             Page: 6 - fast

             Page: 7 - slow

From Western sources:


               48kb firm:
fast memory: # 8000 - # ffff


              128kb firm:

             Page: 0 - fast

             Page: 1 - slow

             Page: 3 - slow

             Page: 4 - fast

             Page: 6 - fast

             Page: 7 - slow


             Spectrum +2, +3

             Page: 0 - fast

             Page: 1 - fast

             Page: 3 - fast

             Page: 4 - slow

             Page: 6 - slow

             Page: 7 - slow


   It is easy to see that the 0th page
is fast on any computer.

   Clearly, many programs
well-established in some
users who refused to work or
worked correctly in others. Examples
widely known: ProTracker 2. 1, Black
Raven, UFO 1-2, MicroEditor .. ProTracker
3.31 works on the "Krasnodar", but catches
glitches on the "Impulse" ...

   It should also be noted that for
achieve maximum compatibility with
different models need to
In the second mode
Interrupt routine of their service
was in the fast memory.
The presence of 257-byte table also
necessary.

   For Timex'a need to install all
Music coprocessor registers to 0.

 Q: How do I use the test results?
 A: Very simple. Suppose you need 0th logical page, where you
is scrolling. The easiest way:


       ...

       LD HL, PAGS; address of page table

       LD A, (HL)

       CALL K128

       ...


   Where K128 - routine switching
pages.

   In the general case, however, can be used
index pair (IX, IY):


       ...

       LD IX, PAGS

       LD A, (IX + N)

       CALL K128

       ...


   Where N - number of logical page.


   You need to arrange
downloadable logical pages on
disk in a certain order, and then
act as described above.

   By the way, if you need to have one of the
Page was not involved in the sorting of
priorities of speed, it is also easy
do (pointing SIZE smaller by 1 than
total number of pages and this page
should be the last in the table).

               WARNING!!!

   If the test at any
computer malfunctioned, please
report it to the address of the publisher.

   I hope this article helps
You create Upscale PROGRAM
work on all computers.

   In general, the program is much less
all written above).


   I want to thank VTS'u,
which gave an idea of ​​the
test.

; AutoConfig 1.0
; (C) 1998 Viper / Techno Laboratory

ST EQU # 10; SHIFT TO THE TABLE

               ; SPEED ON

               ; Page table

SIZE EQU 3; NUMBER OF PAGES subjected; GAYUSCHIHSYA SORT OF 
SPEED 

ORG # 8000
ENT

LD IX, PAGS
LOI LD A, (IX)
OR A
JR Z, ENY
CALL MET
LD A, D
OR A
JR Z, SLOW
SUB A
COP LD (IX + ST), A
INC IX
JR LOI
SLOW LD A, 1
JR COP
ENY CALL SORT
RET

MET DI
CALL K128
LD HL, # C000
LD A, # C1
LD B, L
INN LD (HL), A
INC L
DJNZ INN
INC H
LD (HL), A
DEC A
LD I, A
LD HL, INT
LD A, 195; JP
LD (# C1C1), A
LD (# C1C2), HL
IM 2
LD DE, 0
EI
HALT
LD HL, I2
LD (# C1C2), HL
M0 INC DE; 243 * 255 => slow = 61965
LD B, 16
M1 DJNZ M1
LD A, R
INC HL
JR M0

I2 DI
POP HL
LD A, # 3F
LD I, A
IM 1
INT EI
RET

K128 PUSH BC
LD BC, # 7FFD
OUT (C), A
POP BC
RET

SORT LD B, SIZE-1
L0 LD C, SIZE-1
LD IX, PAGS + ST
L1 LD A, (IX)
LD D, (IX +1)
CP D
JR C, N1
JR Z, N1
LD (IX), D
LD (IX +1), A
LD A, (IX + ST)
LD D, (IX + ST +1)
LD (IX + ST +1), A
LD (IX + ST), D

N1 INC IX
DEC C
JR NZ, L1
DJNZ L0
RET

PAGS DEFB 17,19,23,16
DEFB 0