Search found 198 matches

by zsolt
Mon Dec 09, 2019 4:57 pm
Forum: Development
Topic: New year, new projects?
Replies: 12
Views: 1938

Re: New year, new projects?

Hi,
siggi wrote:
Mon Dec 09, 2019 12:42 pm
... a GAL can also do more complex things ...
I agree, a GAÁL can do ;)
I have a dream for next year (it is in design phase):
Elevator.png
room_01.png
room_02.png
may be available next Christmas :D

Regards,
Zsolt (Gaál)
by zsolt
Sat Nov 16, 2019 12:05 am
Forum: Hardware
Topic: RAMPACK and Hi-RES mod ?
Replies: 19
Views: 1402

Re: RAMPACK and Hi-RES mod ?

bola_dor wrote:
Thu Nov 14, 2019 11:53 pm
... (I post here my own diagram from about 30years ago) RAM used are 2x 6264 ...
It is OK, just do not use the /RD line (remove/disconnect from pin 22 of 6264).
and connect pin 22 to pin 20 (/OE to /CS)
and connect pin 22 to pin 20 (/OE to /CS)
by zsolt
Tue Nov 12, 2019 1:13 pm
Forum: Hardware
Topic: RAMPACK and Hi-RES mod ?
Replies: 19
Views: 1402

Re: RAMPACK and Hi-RES mod ?

Is a NOT gate and the rectangles ar the two ICs mounted on top the other :o :? Yes - sorry for the sketch, just the Excel was at hand. About the "without components" mod.. I have some doubts I marked on the picture.. Purple arrow: is the thick way cutted ? Green arrow: are the three leads soldered ...
by zsolt
Mon Nov 11, 2019 5:21 pm
Forum: Hardware
Topic: RAMPACK and Hi-RES mod ?
Replies: 19
Views: 1402

Re: RAMPACK and Hi-RES mod ?

For the two SRAMs I would use this schematic rather
(the /RFSH is not necessary, can be VCC)
(the /RFSH is not necessary, can be VCC)
and i am using this for TS1016
Regards,
Zsolt
by zsolt
Wed May 22, 2019 4:26 pm
Forum: ZX BASIC
Topic: ZX81X2.ROM - and the big bang
Replies: 36
Views: 10358

Re: ZX81X2.ROM - and the big bang

Sorry for this long silence - I was on a (very) long weekend in Barcelona. :D The original CLS (more exactly the LOC-ADDR ) routine uses the sv. VARS as a pointer, from which it is searching and counting backward the N/L characters (24+1) to get exact line address. So it skips those 32 extra bytes ....
by zsolt
Tue May 14, 2019 9:26 pm
Forum: ZX BASIC
Topic: ZX81X2.ROM - and the big bang
Replies: 36
Views: 10358

Re: ZX81X2.ROM - and the big bang

Dear Siggi and Joachim, Did you know that the d-file of your program is longer than should be? :o It contains 32 extra bytes after the latest N/L character in front of the beginning of the variables. Sysvar D_FILE ($400C) points $40F3, and the VARS ($4010) points $442C. The difference is $0339 (825 ...
by zsolt
Tue Dec 25, 2018 12:06 pm
Forum: Welcome Area
Topic: Merry Xmas and Happy Holidays
Replies: 9
Views: 2883

Re: Merry Xmas and Happy Holidays

Merry Christmas to all,
Zsolt
by zsolt
Sun Nov 11, 2018 6:44 pm
Forum: ZX BASIC
Topic: SPeccy ON the ZeddY
Replies: 100
Views: 32302

Re: SPeccy ON the ZeddY

Hi Siggi, No, these are ZX81-specific patterns, but ... In SPONZY they are available as UDGs ( chr$ 144 ... chr$ 164 ), which are defined during the startup: L0000: out ($FD),a ; Switch NMI off! LD DE,$FFFF ; Set pointer to top of possible physical RAM. JP L11CB ; Jump forward to common code at STAR...
by zsolt
Fri Nov 09, 2018 1:51 pm
Forum: ZX BASIC
Topic: SPeccy ON the ZeddY
Replies: 100
Views: 32302

Re: SPeccy ON the ZeddY

Hi,
siggi wrote:
Fri Nov 09, 2018 11:05 am
And is it not possible to have only one rom (including Erik's patches)?
It is more than possible :D just use the sponzy2018.rom above - it contains Erik's patch.
Regards,
Zsolt
by zsolt
Thu Nov 08, 2018 5:12 pm
Forum: ZX BASIC
Topic: Possible bug in ZX81x2 ROM ?
Replies: 36
Views: 6691

Re: Possible bug in ZX81x2 ROM ?

Moggy wrote:
Fri Nov 02, 2018 8:58 pm
Slow down Zsolt I'm running out of EPROMS!! :lol:
Sorry Moggy, here is a newer one. :lol:
Zsolt