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Echo #05
31 августа 1998 |
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Programming - Driver memory.
Programming
Driver Memory
(C) Pawel / RS
This driver is processing,
published in the ZX-FORMAT'e 5.Teper presence of 128-th memory
is not determined by ROM during the test did not spoil the
bytes in the banks, the table used by banks formed a special
podprogrammkoy, which significantly reduces the amount of
assembly and text and object code. In addition, the driver was
reorganized in order to allocate blocks unnecessary after the
memory test. After the test, the number of available banks
stored in the variable PAGE, and the type of computer in TYPE,
to decipher its combination bits, you have to read the
ZX-FORMAT. Switching logic banks implementing subprogrammes
ONPAGE. This driver been successfully used in REAL COMMANDERe,
as well as in the older program that potrekovaya copiers
REALCOPY. Its reliability tested long-term use of these
programs.
; Memory driver
; (C) Pawel / RS
; (C) Creator
, Before working with a driver call signature; rogrammu START,
for initialization and the definition, the division of free
memory.
; Connection logical bank number of A,
, The numbering starts with zero.
ONPAGE PUSH BC
PUSH HL
LD C, A
LD B, 0
LD HL, TABL_PG
ADD HL, BC
LD A, (HL)
POP HL
POP BC
EX_RAM DI
PUSH HL
PUSH AF
PUSH BC
LD HL, TYPE
BIT 1, (HL)
JR NZ, ZS256
BIT 2, (HL)
JR NZ, PROFI
BIT 3, (HL)
JR NZ, TURBO_2
BIT 4, (HL)
JR NZ, ATM1
BIT 0, (HL)
JR NZ, SPECCY
BIT 7, (HL)
JR NZ, SPECCY
JR TDK
TURBO_2 PUSH AF
PUSH IX
AND 24
CPL
LD BC, # FFF7
CALL OUTC_A
POP IX
POP AF
JP SPECCY
ATM1 LD BC, # FDFD
PUSH AF
RRCA
RRCA
RRCA
AND 3
JR HOME
PROFI LD BC, # DFFD
PUSH AF
RRCA
RRCA
RRCA
AND 7
JR HOME
ZS256 PUSH AF
LD B, A
AND% 00001000
RLCA
LD C, A
LD A, B
AND% 00110000
RLCA
RLCA
ADD A, C
LD BC, # 1FFD
HOME OUT (C), A
NOP
POP AF
SPECCY LD B, A
AND 24
RLCA
RLCA
RLCA
LD C, A
LD A, B
AND 7
ADD A, C
OR 16
LD BC, # 7FFD
OUT (C), A
NOP
TDK POP BC
POP AF
POP HL
RET
OUTC_A LD IX, 10835
PUSH IX
JP 15663
; Initialization and test of memory, called
, In the beginning, after which occupy memory; May program
below can be used, vat, at its discretion.
START CALL TEST
LD A, (8)
CP # 2A; if SCORPION, then
RET Z; remove from list
LD C, 8, 8-th bank, using
JP DEBUG; the formed monitor.
TEST CALL TABINIT
XOR A
LD (TYPE), A
INC A
LD (PAGE), A
DI
LD A, (# 08)
CP # C3
JR NZ, ITURBO
LD HL, TYPE
SET 7, (HL)
ITURBO LD HL, (1111)
LD BC, # FFF7
LD A,% 00011111
CALL OUTC_A
LD DE, (# C000 +1111)
AND A
SBC HL, DE
LD BC, # FFF7
LD A, 255
CALL OUTC_A
JR NZ, IDFFD
LD HL, TYPE
SET 3, (HL)
JR I7FFD
MM_ATM DB # DB, # 1F, # C9
IDFFD LD HL, # 80
LD DE, # 1000
LD BC, # DFFD
OUT (C), D
NOP
LD A, (HL)
INC (HL)
CP (HL)
LD (HL), A
OUT (C), E
NOP
JR Z, I1FFD
LD HL, TYPE
SET 2, (HL)
OUT (C), D
NOP
LD B, # 7F
OUT (C), D
NOP
LD B, # DF
OUT (C), E
NOP
JR I7FFD
I1FFD LD DE, # 1110
LD B, # 1F
OUT (C), D
NOP
LD A, (HL)
INC (HL)
CP (HL)
LD (HL), A
OUT (C), E
NOP
JR Z, IFDFD
XOR A
OUT (C), A
LD HL, TYPE
SET 1, (HL)
JP I7FFD
IFDFD LD B, C
LD HL, # FFFF
OUT (C), D
NOP
LD B, # 7F
OUT (C), D
NOP
LD A, (HL)
LD (RBT2 +1), A
LD (HL), D
LD B, C
OUT (C), E
NOP
LD B, # 7F
OUT (C), D
NOP
LD A, (HL)
LD (RBT +1), A
LD (HL), E
LD B, C
OUT (C), D
NOP
LD B, # 7F
OUT (C), D
NOP
LD A, (HL)
CP D
JR NZ, I7FFD
LD HL, TYPE
SET 4, (HL)
I7FFD LD HL, # FFFF
LD B, # 7F
OUT (C), E
NOP
LD A, (HL)
LD (RBT0 +1), A
LD (HL), E
OUT (C), D
NOP
LD (HL), D
OUT (C), E
NOP
LD A, D
CP (HL)
JR Z, SIZED
LD HL, TYPE
SET 0, (HL)
SIZED LD HL, # FFFF
RBT0 LD (HL), 0
LD B, C
OUT (C), E
NOP
LD B, # 7F
OUT (C), D
NOP
RBT LD (HL), 0
LD B, C
OUT (C), D
NOP
LD B, # 7F
OUT (C), D
NOP
RBT2 LD (HL), 0
CALL VIRT
LD A, (PAGE)
CP 8
JR C, ENDING
LD A, (TYPE)
CP 1
JR NZ, ENDING
LD HL, TYPE
SET 5, (HL)
ENDING XOR A
CALL EX_RAM
EI
RET
VIRT LD IX, # C000
LD HL, VTABL +63
LD B, 64
V_R11 LD A, B
DEC A
CALL EX_RAM
LD C, (IX +0)
LD (HL), C
LD (IX +0), A
DEC HL
DJNZ V_R11
PUSH AF
LD A, LENTABL-1
LD (PAGE), A
POP AF
LD DE, TABL_PG
V_R20 LD A, (DE)
CP # FF
JR Z, V_R30
CALL EX_RAM
CP (IX +0)
JR Z, V_R22
PUSH DE
LD HL, TABL_PG + LENTABL
AND A
SBC HL, DE
PUSH HL
POP BC
PUSH DE
POP HL
INC HL
LDIR
PUSH HL
LD HL, PAGE
DEC (HL)
POP HL
POP DE
DEC DE
V_R22 INC DE
JR V_R20
V_R30 LD B, 64
LD HL, VTABL
V_R31 LD A, 64
SUB B
CALL EX_RAM
LD A, (HL)
LD (IX +0), A
INC HL
DJNZ V_R31
RET
; Removal from the table of the bank with the number in
; Register C, is called immediately after the test.
DEBUG PUSH DE
POP HL
NO_PG1 DEC DE
LD A, (DE)
CP # FF
JR Z, NO_PG2
CP C
JR NZ, NO_PG1
SBC HL, DE
PUSH HL
POP BC
PUSH DE
POP HL
INC HL
LDIR
PUSH HL
LD HL, PAGE
DEC (HL)
POP HL
DEC HL
DEC HL
NO_PG2 EX DE, HL
RET
; Create a table of banks, with the exception of
; Not used in this version
; Removed the 2 nd and 5 th banks.
TABINIT LD HL, TABL_PG-1
LD (HL), 255
INC HL
XOR A
TABI1 LD (HL), A
INC A
CP 2
JR Z, TABI1A
CP 5
JR Z, TABI1A
JR TABI2
TABI1A INC A
TABI2 INC HL
CP LENTABL +1
JR NZ, TABI1
LD (HL), 255
LD HL, VTABL
PUSH HL
POP DE
INC DE
LD BC, 63
LD (HL), 0
LDIR
RET
LENTABL EQU 62; maximum koliches
, Employs a
; Banks.
DB 0; start code table
TABL_PG DS LENTABL +1
TYPE DB 0; type of computer
PAGE DB 0; total number of available
; Banks
VTABL EQU 23296; table banks used
, Uses only
; Under test 64 bytes
----------
16.09.98
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