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#1 2012-02-21 08:18:34
- siggi
- Well known member
- Registered: 2007-07-26
- Posts: 159
C-Interrupt routine for ZX81
Unfortunately the IM2 features of Z88DK cannot be used with a ZX81. But it would be nice, if it were possible to hook a C function into the display routine, so that is called 25 or 50 times/sec during SLOW mode (of course outside the time critical section of the display routine).
I ported a IRC chat program from Spectranet zo ZeddyNet. The Speccy version uses IM2 to read and buffer keyboard entries. My workaround on the Zeddy works, but using INTs would be much better 
BTW: Could you perhaps add information into WIKI, which libraries are (not) reentrant and (not) romable?
Siggi
EDI: Upps, I mixed NMI with IM2 ...
Last edited by siggi (2012-02-21 10:03:46)
My ZX81 web-server, compiled with Z88DK V1.7:
http://zx81-siggi.endoftheinternet.org/index.html
Online since 2007 ...
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#2 2012-04-17 04:55:42
- alvin
- Administrator
- Registered: 2007-07-16
- Posts: 338
Re: C-Interrupt routine for ZX81
i have a large rewrite coming that will include an opportunity to reorganize the startup code for all targets, which would include addressing these sorts of problems.
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#3 2012-04-17 10:19:27
- stefano
- Administrator
- Registered: 2007-07-16
- Posts: 696
Re: C-Interrupt routine for ZX81
Ok then, I will stop any adaption of the CRT0s and of the main libs Makefile. 
Something could still happen in the 'math' folder, if all goes as expected..
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#4 2012-04-17 18:55:08
- alvin
- Administrator
- Registered: 2007-07-16
- Posts: 338
Re: C-Interrupt routine for ZX81
There is no need to stop stef
The test target(s) will exist in parallel for a while yet. The main thing will be a rewrite of stdio and an update to more conformance with c99. The immediate goal is to get networking integrated and to have a model that supports many attached devices through a device driver abstraction attached to the end of a file stream.
Existing library code will only be added incrementally as things are checked for romability, opportunities for improvement, etc, so the test targets will be missing things initially. z88dk has grown a lot over the years through add-ons, so I think this is the right time to take a fresh look at how the whole should fit together.
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#5 2012-04-17 18:59:46
- stefano
- Administrator
- Registered: 2007-07-16
- Posts: 696
Re: C-Interrupt routine for ZX81
Agreed, hope I'll have the energy to help 
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