Search found 202 matches

by zsolt
Thu Apr 05, 2018 1:17 pm
Forum: ZX BASIC
Topic: Let's calculate! - renewed arithmetic routines
Replies: 33
Views: 10682

Let's calculate! - renewed arithmetic routines

Dear Zeddy Fans, Over the past few months I spent a lot of time writing and testing new arithmetic routines. The "addition" was completely rewritten, the core of the "division" and the "multiplication" have not changed (just got reorganized :) ) , but the pre- and post-operations were rewritten. The...
by zsolt
Wed Mar 14, 2018 3:46 pm
Forum: ZX Spectrum Lounge
Topic: Sinclair Zx Spectrum: absolutely better ...
Replies: 13
Views: 4625

Sinclair Zx Spectrum: absolutely better ...

Hi,
I just deleted the broken links in my browser's "favorites" folder, and I found this story - again. (very nostalgic) :D
Zsolt
by zsolt
Wed Mar 14, 2018 12:11 pm
Forum: ZX BASIC
Topic: SPeccy ON the ZeddY
Replies: 100
Views: 34158

Re: SPeccy ON the ZeddY

Hi, Is the NMI aktive and handled similarly by SPONZY like by the ZX8-ROM (decrements A' and count NMIs to generate a video image)? The NMI is active, but the handler is different (the Speccy uses/requires all the registers): ; ------------------------------------ ; THE 'NON-MASKABLE INTERRUPT' ROUT...
by zsolt
Mon Mar 12, 2018 1:22 pm
Forum: ZX BASIC
Topic: SPeccy ON the ZeddY
Replies: 100
Views: 34158

Re: SPeccy ON the ZeddY

Sorry Shaun,
I don't have ZXMORE - PokeMon will surely write the correct answer.
Regards,
Zsolt
by zsolt
Sun Mar 04, 2018 8:31 pm
Forum: Development
Topic: Wilf's NOVA2005 for 50 Hz Zeddies?
Replies: 11
Views: 2906

Re: Wilf's NOVA2005 for 50 Hz Zeddies?

Hi Siggi, I think the timing problem comes from elsewhere - you have to modify this part also: VDP2 ADD HL,DE ;TRUE START OF DISPLAY LD A,(LINES) ;CALCULATE NUMBER OF LINES AND 1F ; LD B,A ;SAVE IN B RLCA ;CALCULATE BALNK LINES RLCA ; RLCA ; ADD A,3B ; EX AF ;SAVE IN AF’ FOR NMI LD C,08 ; JR ZDP2 ;G...
by zsolt
Sun Mar 04, 2018 1:28 pm
Forum: ZX BASIC
Topic: SPeccy ON the ZeddY
Replies: 100
Views: 34158

Re: SPeccy ON the ZeddY

Shaun_B wrote:
Sun Mar 04, 2018 12:38 pm
I'm not able to get this to work with EightyOne emulator, what I am I doing wrong?
Hi Shaun,
Using Options/Hardware menu, you have to enable the hi-res displaying (WRX) and then select the sponzy.rom.
HTH,
Zsolt
EO_sponzy.png
by zsolt
Sun Mar 04, 2018 1:03 pm
Forum: Development
Topic: Wilf's NOVA2005 for 50 Hz Zeddies?
Replies: 11
Views: 2906

Re: Wilf's NOVA2005 for 50 Hz Zeddies?

siggi wrote:
Sat Mar 03, 2018 7:05 pm
I have patched NOVA2005 at address 16606, which contains (before relocation to top of ram) the value $EC (236) and poked it to 200 ($C8).
Try it using $CC (204) - the line counter seems to be 4 at start of displaying.
Gruß
Zsolt
by zsolt
Sun Mar 04, 2018 11:05 am
Forum: ZX BASIC
Topic: SPeccy ON the ZeddY
Replies: 100
Views: 34158

Re: SPeccy ON the ZeddY

Hi,
The real 16K programs do not require M1NOT mod (it enables program execution in $8000-$BFFF range).
Most of those softwares, which run on 16K Speccy, wiil work with SPONZY.
Regards,
Zsolt
by zsolt
Mon Dec 25, 2017 10:44 am
Forum: Sinclair Misc
Topic: Happy Christmas
Replies: 10
Views: 2778

Re: Happy Christmas

:D
MCAHNY_GZS.P
Zsolt
(9.7 KiB) Downloaded 121 times
by zsolt
Wed Sep 13, 2017 12:39 am
Forum: Software
Topic: Charlie's Red Ant - a ROM instruction that reads throughout memory
Replies: 22
Views: 7144

Re: Charlie's Red Ant - a ROM instruction that reads throughout memory

The timing must be the same, but B gets a value that is not allowed. OK, it is time-correct, but does not solve the original "problem": * Yes, the ZX81 appears to have a pet - a restless red 'ant' (escaped from the classic game?) which relentlessly patrols RAM from the end to the start. It's (most ...