C O D I N G
(C) Z-ZERO
Perhaps, it is most painful issue for anyone who bursting
with pride from the fact that He works at Speccy. For me, this
topic at least the patient, after reading Wikipedia
in the ZX-PILOT'e # 34, signed VIRTUAL'a -
me (figuratively speaking) took the "anger" and
VEL has acted as the instigator ... In short,
read.
To start touch the topic "conversion of addresses in the
display area.
Entrance:
HL - address of the upper byte of the necessary familiarity.
Weekend:
HL - address corresponding to the attributes.
SRL H
SRL H
SRL H
SET 4, H
SET 6, H
And the reverse protsedurka ...
Entrance:
HL - address in atribitah.
Weekend:
HL - address of the upper byte of the corresponding
familiarity.
SLA H
SLA H
SLA H
RES 7, H
Shorter than an all-time!
Next prog, performs conversion of pixel rows from the bottom
up.
LD HL, # adr in screen
DEC H
LD A, H
AND # 0F
CP # 07
JR Z, CONT
CP # 0F
RET NZ
CONT LD A, L
SUB # 20
LD L, A
RET C
LD A, H
ADD A, # 08
LD H, A
RET
Immediately say, that in the ZX-Review mentioned the
shorter, but I have not seen or tested, and this satisfies me
authorized.
Annex (VEL! They must be!!!) Hangs another of my prog (ALASM
FORMAT), Koya designed to survey the keyboard, not
regardless of interruptions, as well as not
deskriminiruyuschaya SCORPION'schikov.
Entrance:
NISHISHA!
Weekend:
In the A-code key pressed.
Comment:
After starting the prog hangs there and waits. Interviewed
as a simple click, so and through CapsShift 'SymbolShift, as
well as: Break, SS + Enter, SS + Space, CS + Enter, ExtMode,
codes Delete, Graphic, Cursor, Edit, CapLock, True Video,
Inverse Video. In! The entire survey is performed by a table
that can be easily changed.
11/XXII-99
Z-Zero SYSTEMS inc.
