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Pentagon interface news from VELESOFTIt's from Xagon's board. It is about new interface for Speccy - it make Your comp compatible with Pentagon (and not only) and also it gives You up t…
... 6 and 7 of port 7FFD.
ALLRAM mode possibility (see ... ,6 and 7 on port 7FFD.
Intersting thing is that ... ram)
Page switch via 7FFD, like on ZX128.
Higher ... -
what extra port for extra memory ? (256K, 512K, 1024K, etc.)I know that Pentagon uses some extra bits from port 7FFD for extra memory pging: - for 512K model, bit 6 & 7 of port 7FFD - for 1024K model, bit 5, 6…
... extra bits from port 7FFD for extra memory pging ... 6 & 7 of port 7FFD
I personally ... that handle directly the 7FFD port, without taking into ... lock the port 7FFD (on +128K/+2) and 7FFD & 1FFD ... I will never use port 7FFD for this.
Port 0x7ffd Partial DecodingI'm trying Pitfighter on my emulator and it runs in +2A/+3 mode but crashes in 128k/+2 mode. I traced it down to an OUT instruction which sends 4 to …
... port address from 00FD to 7FFD (faq:hardware will respond to ... the partial decoding (respond to 7FFD only) to fix it but ...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…
... ROM banks, and emulated port 7ffd. I added periodic (ish 50 ...RAM paging and port usageDear users and developers, I'm just trying to find some detail information about RAM paging on the Spectrum 128 and later models, especially those a…
... 128k and +2:
port 7ffd bits 0..2 select one ... 6 and 7 of port 7ffd are also used to select ... bits 0..2 of port 7ffd. My proposal would be a ...nmi menu for MB02+, new fixed versionDear MB02+ users and all others, on my site hood.speccy.cz you will find a fixed version of nmi menu. There was an error, when loading 128k .SNA sna…
... snap and paging on port #7FFD was 0-7, BSDOS finished ...RUSSIAN SOFTWARE and real ZXRussian ZX games is writed on russian ZX clones and support hardware feature TURBO OFF ( for ZX clone ZS SCORPION ). Russian ZX clone ZS SCORPION use…
...
Write only ports #7FFD and #1FFD is used on ... and +3 is port #7FFD and #1FFD(with different ... bug - after read port #7FFD will ZX crash (data ... port).
Read port #7FFD = on ZX128/+2 write ... ZX128/+2 use paging port #7FFD only. Hardware use incomplette ...128kB software with incorrect memory pagingI search all ZX software using incorrect memory paging via OUT (253),A. This software must write to port data value with D6=1 for compatibility with …
... ,D7 and D5 on port #7FFD (unused on original ZX128 models ...Midi Out from machine codeI need to send midi-signals by machine code, while Basic is too slow for my current project. I already read I can use hookcode #11E, but I have some …
... hookcode #11E:
1. OUT #7FFD, 0
2. OUT #1FFD ... the mapping:
1. OUT #7FFD, (23388 ) - in 23388 the previous ... be Z80-compatible):
OUT #7FFD, 0
OUT #1FFD, 0 ... /> OUT #1FFD, (23399)
OUT #7FFD, (23388 )
'A' should ...Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …
... 1MB ram
+ paging port #7FFD at 90% compatible with ZX128 ... )[/B]
- paging port #7FFD can't select second videoram ...Emulation of ZX Spectrum 128+2 (grey)Please read this thread: [url]http://www.worldofspectrum.org/forums/showthread.php?t=35523[/url] result: exist 3 (or more) versions of grey ZX Spect…
... crash after reading from port 7FFD.
Emulator REALSPECTRUM in ... mode crash after PRINT IN 7FFD, but ZX SPIN not crash ...Is it possible to access the +3 disk drive via m/c in USR0 mode?Is it possible to access the disk drive of the +3 via m/c +3DOS calls when running in USR0 mode? I ask because I'm having an awful lot of trouble ge…
... ),sp ; 36864
ld bc,$7ffd
ld a,($5b5c)
di
ld bc, $7ffd
ld a,($5b5c)
di
ld bc,$7ffd
ld a,($5b5c)
di
ld bc,$7ffd
ld a,($5b5c)
128kB snapshot on ZX48kBWhat is best way for 128kB snapshot loading on 48kB models ? Some Z80 snapshots are 128kB versions (Z80 v2 or v3) but contain 48kB games. Same proble…
... signed on value of port 7FFD. 128 snapshot with locked memory ... current ram page from port 7FFD. ( I must add loading ... current ram page from port 7FFD only if:
- snapshot contain ... locked port 7FFD
- stack pointer is in ...Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]
[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]Idk>le me browsing through some game's code >..... [code]61A8 F5 push af 61A9 3EFF ld a,FF 61AB D37F out (7F),a 61AD D33F ou…
...
6237 01FD7F ld bc,7FFD
623A ED59 out (c ...Hardware description - BETA DISK interfaceExist more versions and clones of BETA DISK interface. Beta disk 48, beta disk 128, brasilian clones of beta disk 48, russian clones of beta disk 128…
... ZX paging port #7FFD. After each OUT 7FFD,xx are bit D4 ... rom set 128rom on port #7FFD. (on some new betadisc clones ... set (only writing to port #7FFD work always). This feature enable ...
#FF 111xxx11
#7FFD detect only writing to adress ...Hardware description - MULTIFACE 3[B]Hardware description - MULTIFACE 3[/B] This is description of MF3 clone, because I can't find more about original interface. Schematic and PAL ch…
... ports #1FFD,#3FFD,#5FFD and #7FFD. Last writed data to all ... (addressing 0101xxxx 11111101)
- OUT #7FFD (addressing 0111xxxx 11111101)
7FFD
IN x,# ... last data writed to port #7FFD
If you disable MF3 ...Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …
... the partial decoding of port 7FFD, as this differs between the ... />
[code]detect ld bc,$7ffd ; official paging port
ld ... />
ld b,$7f ; port 7ffd again
out (c),l ...Restoring AY registersAfter doing (not still finished) the sna to tap converter, I'm going to try to do the same for 128k snapshots. I've got threee ideas about what to do…
... .
5.- Restore page register $7ffd.[b](*)[/b]
6.- Load ...Zero v0.8Pigs can apparently fly because it's the v0.8 update of Zero that no one asked for but is out for public consumption anyway. Grab it [url="https:/…
... /> - Fixed screen flip timing during 7ffd out - passes ptime test now ...My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …
... />
Important Ports
7FFD - 128k paging
D0 ... is in place, else ports 7FFD and 1FFD decide which portion ...A game that took the Spectrum to its maximumWhat Spectrum games took it to the maximum of its capacity? I think R-Type is a good example. What are yours?
... is from bit3 / port out #7FFD.
[quote]Is there any ...A game that took the Spectrum to its maximumWhat Spectrum games took it to the maximum of its capacity? I think R-Type is a good example. What are yours?
... is from bit3 / port out #7FFD.[/quote]
I had forgotten ...Tough paging questionOK... Take this: 1. We have a program compiled and run from within GENS under a Pentagon 128K environment. 2. The program works perfectly. 3. We sav…
... the old:
LD BC,#7FFD
OUT (C),A
7ffd on the 128k (and Pentagon ...Tough paging questionOK... Take this: 1. We have a program compiled and run from within GENS under a Pentagon 128K environment. 2. The program works perfectly. 3. We sav…
... ye goode olde LD BC, #7FFD; OUT (C),A :)
_________________ ...Tough paging questionOK... Take this: 1. We have a program compiled and run from within GENS under a Pentagon 128K environment. 2. The program works perfectly. 3. We sav…
... ye goode olde LD BC, #7FFD; OUT (C),A :)
[/quote ...Any Errors?Any errors you feel Sinclair Research or even Amstrad made with the speccy??
... two spare bits of port 7ffd to specify which 'address space ...
