(C) In Vikulov, Tomsk
I managed to reduce by 1
byte procedure UP, presented in ZX-Revue 4 / 95 by several
authors (Paul Starikov, Edward K. and Andrew Vlasov). Here is a
modification Text:
140.
UP DEC H
LD A, H
CPL
AND 7
RET NZ
LD A, L
SUB 32
LD L, A
RET C
LD A, H
ADD A, 8
LD H, A
RET
2
I changed the design
AND 7
CP 7
RET NZ
at CPL
AND 7
RET NZ
Generally, design
AND N
CP N
JR NZ, LABEL
can be replaced by
CPL
AND N
JR NZ, LABEL,
thus saving 1 byte, and increasing the speed by 3 cycles,
which is important when working with
graphics.
Propose to introduce a "ZX-Review"
section "3D-graphics", which will
considered the problems and solutions related to the
three-dimensional graphics on Spectrum'e. And I propose to
introduce the section "Consultation", which will be addressed
challenges and solutions associated with Spectrum'om. And now
the first questions in this section. Why is the Pentagon-128
begins to "shake" the screen? May be, it is connected with the
signal INT? Why spontaneously printed symbols V, G, T, 5, B,
H, Y, 7? Perhaps this is due to overloading bus D7, so
as I have without buffering connected music coprocessor
or burned some resistors?
*
