SCORPIO ZS 256, QUICK START GUIDE FOR PROGRAMMERS
This material is published purely iformatsionnoy point of view,
unfortunately still some owners SCORPION'ov
(A Ufa of the majority) do not possess this information.
1.1 ALLOCATION OF I / O Ports
1.Port 7FFDh (32765): Fully compatible with your computer
ZX SPECTRUM 128. Sampling occurs at the port
a0, a2, a5, a12, a14 = 1; a1, a15, IORQGE = 0
Nznachenie discharge of this port:
D0-D2-specified number of pages of RAM to be included in the
region C000h-FFFFh
D3-switching RAM addresses start screen: 0-ZX128 ,1-ZX48
D5 -1 in this bit blocks the further conclusion to the port
7FFD, until it reset. This usually occurs in the transition
mode BASIC48 and need to turn off more memory. Appeal to the
port 7FFDh can only occur at level of machine code. Record any
information by the operator BASIC OUT will either reset or hang
the computer. When using this port at the code necessary to
prohibit the termination of the time change the content of this
port. 2.Port 1FFDh (8189) - an additional port for management
computer. xporta Sampling occurs when:
a0, a2, a5, a12 = 1; a1, a14, a15, IORQGE = 0
Appointment of bits of this port:
D0 - bit block ROM in the region 0-3FFFh; record 1 allows
writing and reading of zero page RAM.
D1 - select ROM Expansion (using PZU27512) in this ROM
is the main part of the informal service monitor
D2 - used to display on the RS-232C
D3 - not used
D4 - expansion RAM zapis1 - connects to the region C000h-FFFFh
page of RAM with a number from 8 to 15. Specific page number
determined by the bits D0-D2 port 7FFDh.
D5 - strobe signal to the interface CENTRONICS, to form the
necessary software to form a gate in the single pulse
discharge.
D6 - not used
D7 - not used
When you reset all bits of port 1FFDh set to "0".
Appeal to this port can only occur at the level of
machine kodov.Zapis any information by the operator
BASIC OUT lead either to discharge or to hang companies. An
exception is the management of discharge D2, D5. 3.PORT
0FFh-port current attributes screen.
Sampling port occurs at a0, a1, a2, a5, DOS / = 1; IORQGE = 0
When reading from a port 0FFh shall enter into the CPU values
attribute of familiarity, which takes place on the map
display screen. If at the moment is reading a map
Border, then enter a value 0FFh.Te same data will be entered
in the CPU, if the command is executed to read from any
non-existing port, ie, will not be selected any physical port
or on board "Scorpion", nor on the boards periphery. This port
is introduced into the motherboard of a computer to provide a
more complete software compatibility with the ZX Spectrum 48.
4.Port 0FEh (keyboards).
Sampling port occurs when a1, a2, a5, DOS / = 1; IORQGE = 0
bits D0 ... D4-input keyboard
discharge D5 - input tape,
bit D6 - used to enter by RS-232C,
pazryad D7 - used for signal analysis, "BUSY" interface
"CENTRONICS".
5.Port for the printer (Centronics) - FFDDh (65,501).
Sampling port occurs at a0, a2 = 1; a1, a5, IORQGE = 0
In this port is write the character code, issued by
printer.
Possible to use this port for other purposes
As Fringe output channel.
5.Porty musical coprocessor AY-3-chip 8912.Eta
contains 16 registers, chosen by
write register number to port 0FFFDh (65,533), and then reading
contents of this register at the same address, or writing the
new contents of the selected register at 0BFFDh (49,149).
Choosing number of the register once, you can then any number
of times to write / read data to / from it. And just when you
switch to another register is required to rewrite the contents
of the port at 0FFFDh.
7.Porty system TR DOS. These ports are only available
in the transition to a system of TR DOS (signal DOS / = 0),
with disabled ports for keyboard and screen attributes.
Sampling controller ports TR DOS occurs at a0, IORQGE,
DOS / = 0; bits a1, a5, a6, a7 define a specific port address.
Port 1Fh-register command / status 1818VG93
Port 3Fh-register paths 1818VG93
Port 5Fh-Register sector 1818VG93
7Fh-Port Data Register 1818VG93
Port FFh-entry: the system registry TR DOS:
D0 - drive number
D2 - reset 1818VG93
D3 - readiness
D4 - the choice of a floppy disk
D6 - a recording method (0-FM; one-MFM)
Reading: the state of signals DRQ and INTRQ 1818VG93
D6 - state of the signal DRQ (38 pin. VG93)
D7 - state of the signal INTRQ (39 pin. VG93)
To answer your questions (if we can of course!), If the issues
many, tamp them and pass on a floppy diskette refund.
(Yes, and not empty!)
