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Questions about Vortex Tracker II exported songsHi, I have been experimenting with Vortex Tracker II lately and have a couple of questions. By exporting the song to TAP format, a file is generated…
... af,bc,de,hl
RST #38 ; ROM KBD SCAN if you need ... -
DIVIDE versus ZX128 ROMDivide interface use hardware mapping of extra memory on this fixed points in 48rom: #0000 - power-on/reset/rst0/software restart #0008 - syntax erro…
... error
#0038 - im1 interrupt/rst #38
#0066 - nmi routine
rom 1) after each reset/power ... on mapping points in external rom memory. Also exist next big ... in ROM0, then this ZX128 rom can be compatible with Divide ... -
Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... /> - shadow OS / by rewiring RST 0x00 /,
- ROM extensions,
- IM1 routines ... check the ROM code at location 0x0028 (=target of RST 0x28 call ... therefore hook into RST 28.
QUESTION: disclaimer ... ROM overwrites address ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... processor simply executes an RST 38 instruction if an interrupt is ... the first byte of the ROM (DI, 0xf3) would cause ... secondly a bug in the ROM's NMI routine. It ... was intended that the ROM would jump to the value ... test was reversed in the ROM, so it would jump ... -
Rst #38This, as far as I know, is the ROM procedure that does the keyboard check. (and, at the same time, is what's being executed by interrupt in IM 1 mode…
... as I know, is the ROM procedure that does the keyboard ... -
ZX48k terminal...Hello everybody, I thought someone might help me. I connect my good old ZX48k to my PC via serial (IF1) link, and I was trying to write a little term…
Frankly without delving into the ROM scanning code I couldn't ... starts at &38 (it's called by RST 38).
However you ... -
ZX48k terminal...Hello everybody, I thought someone might help me. I connect my good old ZX48k to my PC via serial (IF1) link, and I was trying to write a little term…
... at &38 because the Z80 performs an RST 38 when operating with ... .
The routine at &38 in the BASIC is actually ... .
Source The complete Spectrum ROM Disassembly, Doctors I Logan & ... -
Basic and AY musicis it possible to play an ay-music in background while a basic program is running?
... know ASM.
Also RST 38 is one byte compared to ... the IM2 setup
RST 38 ; BASIC IM1 routines
PUSH ... some trick with using the ROM to JR but I really ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... processor simply executes an RST 38 instruction if an interrupt is ... the first byte of the ROM (DI, 0xf3) would cause ... secondly a bug in the ROM's NMI routine. It ... was intended that the ROM would jump to the value ... test was reversed in the ROM, so it would jump ... -
Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …
... call an address in the ROM area?
[/quote]
ROM area is an opportunity for ...
These days the ROM is essential for the minigame ... in the ROM.
[/quote]
RST are fast ... fetch from address #0038. RST#38 would be an o/ ... -
Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …
... good way to check your ROM is to remove it from ... by Z80 constantly executing #FF (RST #38 ) instruction. Your RAM will be ... 's very bad that your ROM is not in socket. I ... -
Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... a failure mode of the ROM, the CPU itself or ... a good sign that the ROM is not working. If ... from all ROM locations, which is the machine code instruction RST #38. Therefore ... it'll just execute RST #38 instructions, and ... -
Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... on the screen if the ROM is not present or has ... the RST 38 instruction, so lacking ROM altogether, the CPU just executes RST 38 instructions ... -
Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... on the screen if the ROM is not present or has ... the RST 38 instruction, so lacking ROM altogether, the CPU just executes RST 38 instructions ... .com/wholehog/stuart/spectrum-without-rom.png"]screenshot of this[/URL ... 0x0038, which itself holds an RST 38! -
Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?
... method of paging in the ROM. You've got two ... RAM, since only one ROM can be paged into the ... the IF1 and calls IF1 ROM code, then on return ... chip, you'll get 0xFF (RST #38 ) rather than 0x00 (NOP). ... ROM from a Speccy and power it on - it keeps executing RST #38 ... -
Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?
... to call the Spectrum ROM, though, to call ... to the IF1 shadow ROM or the Spectrum ROM).
RST #38 ) rather than 0x00 (NOP ... ROM from a Speccy and power it on - it keeps executing RST #38 ... $0000 in the Mirage ROM — and if there's ... -
Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…
... RST#38 to happen every 50th of a second, which the ZX ROM ... -
Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…
... one in the 128 Editor ROM, it's horribly complicated and ... at the end of the RST 38 routine).
The routine ... -
IF2 Rom snapshot creationHi, is it possible convert a Speccy 16k snapshot to a Interface 2 Rom file? I've the original Ultimate Pssst, Cookie, Trans-am and Jetpac tapes and …
... this!
[/LIST]
RST 10 won't work with ... fact none of the RST routines (apart from RST 38 ) will work.
ROM.
I recommend Geoff ... fully commented disassembly of the ROM online. I use it a ... -
128K Guru requiredThe answer eludeth me, and I seeketh a higher knowledge! I'm in the process of putting together a very simplistic emulation testbench of my laptop s…
... are booting in the 48K ROM still.
The memory test ... ://www.mjwilson.demon.co.uk/rom/[/url][/QUOTE]
I ... machine.
$ff is RST $38, calling the interrupt routine over ... again...
One swift ROM change later.. all's workin ... -
128K Guru requiredThe answer eludeth me, and I seeketh a higher knowledge! I'm in the process of putting together a very simplistic emulation testbench of my laptop s…
... br />
The 48K ROM in a Spectrum 128 is ... routine at $3c04 in ROM 1 that is called by ... in the "real" 48K ROM, but has been used in ... .
$ff is RST $38, calling the interrupt routine over ... ...
One swift ROM change later.. all's workin ... -
Black ScreenHi, Anyone know what would cause a 48k Spectrum to boot to a black screen? you can hear the internals buzzing at power up, but you just get a black…
... was working but the ROM or even the CPU ... down to zero by the ROM.
Typically ... if the ROM is faulty you'll either ... white stripes. If the ROM is never responding to the ... stripes (the CPU will execute RST #38 over and over again - ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... ;582386]...Then I removed the ROM and found the central display ... />
If you remove the ROM, and if there's not ... . $FF is the opcode for RST $38, which pushes the current PC ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... ;582411]If you remove the ROM, and if there's not ... . $FF is the opcode for RST $38, which pushes the current PC ... some .5 second. At address $38 another &FF will be ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... :
0 for the 128K 'ROM 0'
(i.e. the ... rather different to the 48K ROM)
R for uninitialised RAM ... 5B80 NOP
R 5B81 RST 38
[/CODE ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... /> I had meant that the ROM is paged in after the ... addresses which in the Spectrum ROM contains RST #38 instructions ? I imagine that ... of the Beta interface's ROM were delayed at all, in ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... ]I had meant that the ROM is paged in after the ... addresses which in the Spectrum ROM contains RST #38 instructions ? I imagine that ... of the Beta interface's ROM were delayed at all, in ... some internal machine cycles when ROM is replaced.
You may ... -
Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…
... byte as the Spectrum ROM in this case, although ... ROM to 48 ROM), you get a RET in the RG ROM and RST $38 ... in the 48 ROM. RET is ... to the $0280 (48 ROM to RG ROM) RET (which is ... />
RG:
1FDB RST $38 ($FF)
1FDC XOR $1B ...
