... ZSock - The Z88 TCP/IP stack ...
Сбылась мечта! Творение Клайва Синклера теперь способно
баражировать по просторам всемирной паутины. Технология ZSock
позволяет пусть даже не Spectrum ZX, но хотя бы Z88 соединить со
множеством иных пользователей интернета. Документ приводится в
оригинальном варианте с кратким резюме на русском языке в конце.
* * *
...What is Zsock?
ZSock is a work-in-progress TCP/IP stack for the Cambridge
z88 portable. The stack itself is written almost entirely in C
and was developed using z88dk - the z88 Development Kit.
Zsock is supplied in the form of an application which is
also a package (A package is the z88 equivalent of shared
libraries or dlls) which permits you to be able to write network
aware applications with the minimum of hassle. Included within
the ZSock archive is an example user application and also a
daemon allowing file transfer.
...Zsock has the following features:
- Connection to the 'net via the SLIP protocol
- Implementation of IP/ICMP/UDP/TCP network layer
- Resolving (forward and backward) of hostnames
- Ping client
- "Plugin" Network Driver Devices
- Easily configurable
- Extensive API to allow the writing of network applications
...The example application/daemon supplies:
- A simple telnet program with a VT52 screen
- A tftp daemon allowing file transfer to and from the z88
...History
The ZSock project was started back in June 1998 with a
version implementing ICMP, UDP, TCP and a simple telnet
application in assembler. However is soon became clear that a
hand written assembler TCP stack is no fun, and so a decision
was made to write it in C. But where's the compiler? And so
started the story of z88dk but we'll leave that for now. Zsock
has been a long time in development (most of it spent sat on my
harddrive not doing much!) but since March 2000 it has been in a
usable state, exporting an API for other applications. With
release 12 (Febuary 2001), the tftp daemon returns allowing
automated file transfer to and from the z88 from across a
network.
z88dk - The z88 Development Kit
...What is z88dk?
z88dk is a z80 C cross compiler supplied with an
assembler/linker and a set of libraries implementing the C
standard library for a number of different z80 based machines.
The name z88dk originates from the time when the project was
founded and supported only the Cambridge z88 portable.
The compiler featured in z88dk is much enhanced Small C
compiler, the compiler accepts many features of ANSI C and is
only deficient in a few areas where implementation on a z80
processor might prove inefficient. The compiler performs simple
optimizations, but the bulk of the optimization is done by a set
of peep-hole rules, which will typically reduce the size of a
large project by up to a third.
The libraries supplied with z88dk are designed to be as
generic as possible, indeed it is possible to port to a new
machine simply by supplying two library routines and some
startup code. It is hoped that one day z88dk will support as
many z80 based machines as there is information available and
sufficient interest in.
...z88dk has the following features:
- Small C+ based compiler with structs, floats and other
ANSI extensions;
- Module assembler/linker which only includes required
library routines;
- Peephole optimizer with rulesets that reduce the size of
generated code by ~30% and improve speed;
- Easily retargetted C library including studio routines;
- Retargettable VT100 terminal;
- Support for over a dozen z80 machines (see below for
details).
...Supported Targets
z88dk produces code that will run on the following machines:
Cambridge Computers z88, Sinclair ZX Spectrum,
Sinclair ZX81, CP/M based machines, Amstrad
NC100, VZ200/300, Sharp MZ series, TI
calculators (TI82, TI83, TI83+, TI85, TI86),
ABC80 and the Jupiter Ace. Support is being
developed for other z80 based machines including
the Xircom Rex 6000. Preliminary support is also
available for the Sam Coupe, MSX1 and
Spectravideo machines.
...Platforms
z88dk is known to run on the following platforms: Amiga,
BeOS, HP-UX 9, Linux, Solaris, Win32, Win16 and MSDOS. MSDOS
support may be dropped due to 7inherent limitations it presents.
OpenBSD compiles fail but z88dk should work if compilation is
performed by hand.
...Who's responsible?
Dom Morris started the project in August 1998 targetting the
z88, and adding preliminary Spectrum support, and functional
Amstrad NC100 support. Stefano Bodrato is responsible for the
other ports. Henk Poley recently joined the z88dk team and is
refining and improving, with Stefano, the TI calculator support.
So, if you have a problem with library support (except for
the z88) contact either Stefano or Henk, or a problem with
anything else, or if you want to retarget to a new machine
contact Dom .
* * *
Итак, создано устройство для родственной спектруму
архитектуры, которое поддерживает протоколы передачи данных,
применяемые в internet'e: TCP/IP, SLIP и т.д. Все это позволяет
обращаться к хостам, т.е. серверам, и получать с них информацию,
равно как и закачивать ее. Уже создан кросс компилятор, который
предназначен для создания программ для поддержки этого
инженерного решения. Сама эта программа, детальные технические
характеристики доступны в сети интернет через поисковые машины
по ключу 'zsock'.
