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A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…
[QUOTE=Timmy;594378]Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how easy it actually is. (Actually I've already published this one some time ago, but this ... -
Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
... /> [quote]More Russian software use IM2 vector table in slow memory ... setting register I (IM2 table) to fast memory (or ROM). Exit fixed ... -
Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... ; substituting it with a common ROM loader solves the problem.[/QUOTE ... in the vector for IM2 in the ROM.
this game used ... -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
Did anyone mention that if you don't use the ROM routines (use IM2, or don't use interrupts at all), you can use all of the available RAM any way you want. There's no harm in running code in contended RAM so long as it isn't timing critical. -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
... don't use the ROM routines (use IM2, or don't use ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... being an issue with the ROM resetting stream #2 to point ... that you'd need an IM2 routine to keep it pointing ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... being an issue with the ROM resetting stream #2 to point ... that you'd need an IM2 routine to keep it pointing ... -
128K+ Keypad Swapsies.I've been offered a swap, a Spanish 128k keypad, for one of my UK microdrives. Is this a good swap?
... BASIC ROM (located at 0x386e), hook it up to an IM2 routine ... the keyboard read, and whatever ROM was in use before is ... ; scan keyboard as with 48K ROM
bit 4,(iy+$01 ... ; scan keyboard as with 48K ROM (ROM 3 must be paged in ... -
The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…
... . The real problem is that IM2 is designed for the hardware ... that area of the original ROM will still work (providing the ... to be using hardware with IM2, the chances are you're ... 257 byte chunk of the ROM. If you're writing for ... -
RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…
... be called, as the ROM keeps track of the current ... there. Also the DOS ROM refers to and/or updates ... because of the game's IM2 routine shifting stuff around - ... EI lines in the DOS ROM are conditional (apart from ... was harmless, and restore IM2 for the game when I ... -
Multiface 3 programming guide anywhere?I'm interested in the tantalising little bit of text at the bottom of my Multiface 3 manual (under the "Using 8K RAM" section): "Please send a SAE…
I have disassembled the M3 ROM twice (though not analysed or ... . Bit 1 set if in IM2, bit 2 set if M3 ... -
Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... of register I = #39. ZX rom on +2A/+3 models not ... #39FF two bytes #FF,#FF = IM2 interrupt jump to incorrect adress ... -
Keyboard scanning routines / techniques?What keyboard scanning routines or techniques do people use? I'm looking to write something which doesn't rely on the ROM-based keyboard scanner, an…
... versions - in RAM using IM2 and in ROM.
There are ... -
Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…
... with mouse driver use incomplete IM2 table (often only some last ... unstable data bus and during IM2 interrupt CPU read different vector ... = CPU read different adress of IM2 routine and program crash...
IM2 table in zx rom (I=#3B,etc...) -
Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…
... with mouse driver use incomplete IM2 table (often only some last ... unstable data bus and during IM2 interrupt CPU read different vector ... = CPU read different adress of IM2 routine and program crash...
IM2 table in zx rom (I=#3B,etc ... -
Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... use standard trick with the ROM vector table and I=#39 ... /> The only way to get IM2 working in 16K reliably would ... to find an address in ROM, which looks like #xxFF and ... on the minute detail of ROM implementation. It also will not ... -
Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... ]The only way to get IM2 working in 16K reliably would ... to find an address in ROM, which looks like #xxFF and ... on the minute detail of ROM implementation.[/QUOTE]
Does ... reusing/calling ROM procedures in general constitute a ... -
Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... perhaps?..
Does reusing/calling ROM procedures in general constitute a ... , a new open-source alternative ROM - well, my code is ... " solution compared to using a ROM routine in general. Any major ... , but the use of ROM for IM2 also relies upon non-floating ... -
Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…
... 's at 0100h in mirage.rom:
[code]
xor a ... detected by setting up an IM2 handler, enabling interrupts, and seeing ... -
Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…
... 's at 0100h in mirage.rom:
[code]
xor a ... detected by setting up an IM2 handler, enabling interrupts, and seeing ... -
esxDOS v0.8.5 released (with TR-DOS emulator)Yup, you read right! Now with TR-DOS emulation! More info and download here: [url]http://www.esxdos.org/[/url] Enjoy :)
... LFN) and better TR-DOS IM2 loader support (thru some changes ... the possibility of a bigger ROM. We also asked Velesoft for ... -
esxDOS v0.8.5 released (with TR-DOS emulator)Yup, you read right! Now with TR-DOS emulation! More info and download here: [url]http://www.esxdos.org/[/url] Enjoy :)
... LFN) and better TR-DOS IM2 loader support (thru some changes ... the possibility of a bigger ROM. We also asked Velesoft for ... -
Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…
... ]
It's in ROM so that means it's ... ]
The z80's im2 scheme is very good. The ...
