Replies: 3
Views: 58
Last Post By: sirmorris ON: Thu Jul 29, 2010 7:16 am
Topic By: sirmorris ON: Thu Jul 29, 2010 7:16 am
Apple iie with 80 col, cpm, serial & parallel cards?

Replies: 3
Views: 58
Last Post By: sirmorris ON: Thu Jul 29, 2010 7:16 am
Topic By: nama ON: Wed Jul 28, 2010 11:16 pm
If I didn't already have one I think I'd say yes

Replies: 2
Views: 43
Last Post By: gus ON: Wed Jul 28, 2010 10:41 pm
Topic By: gus ON: Wed Jul 28, 2010 10:41 pm

iturbez wrote:Gus:
¡Un saludo desde el otro lado del charco!
Esto del Zeddy es universal.

For all the members:
Greetings from across the pond
Zeddy is universal!

I'm spanish, so I'm sending greetings in Spanish.

To the members that do not read spanish. This is just a little chat about the universal condition of our beloved machines and my invitation to visit a small preservation project of an Argentinian mag called Programacion Popular (that meas Popular Programming)

Have fun
Gus

Replies: 4
Views: 4218
Last Post By: gus ON: Wed Jul 28, 2010 10:33 pm
Topic By: gus ON: Wed Jul 28, 2010 10:33 pm

superfo wrote:Hi,

Sorry I don't have that magazine any more, I sold on ebay after I scan it.
I don't know who bought it, may be you can ask around.

Hi superfo
Well this is a shame, because I think that this program is a good one... anyway the Article is in good shape so a part of the history is preserved.
Making some google searches I found what can be a copy of this program on a page that has various TS1000 forums uploaded programs... I can't download the P files but I can see the source code...
I will continue the search...

Thanks again for the scans,
Gus

Replies: 3
Views: 58
Last Post By: sirmorris ON: Thu Jul 29, 2010 7:16 am
Topic By: sirmorris ON: Wed Jul 28, 2010 8:23 pm
Chicklet PET?

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Hi guys!

Yes, I still have vertical sync issues. I'll try your mod when I get back to England next week.

Thanks for the information!

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: zx81jens ON: Wed Jul 28, 2010 12:57 pm
Hi!

Here the Photo!

Greetings
Jens

Replies: 4
Views: 4218
Last Post By: gus ON: Wed Jul 28, 2010 10:33 pm
Topic By: superfo ON: Wed Jul 28, 2010 6:22 am
Hi,

Sorry I don't have that magazine any more, I sold on ebay after I scan it.
I don't know who bought it, may be you can ask around.

Replies: 3
Views: 58
Last Post By: sirmorris ON: Thu Jul 29, 2010 7:16 am
Topic By: nama ON: Wed Jul 28, 2010 4:41 am
I have two ZX80's, and I'm looking to trade one for something equally
as unique. I'm hoping for a Jupiter Ace or something at that level.
Let me know if you are interested.
Phil

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: Oliver ON: Tue Jul 27, 2010 10:52 pm
Greetings,

I would like to add some details concerning the modification we made to Jens' ZX80-LEGACY last weekend.

Firstly, the design and the quality of Lee's ZX80-LEGACY board is really phantastic! After replacing a broken 74LS74 (it just did not provide the divided 3.25MHz CPU clock), the computer bascally worked immediatelly.


Initially, we had a vertical rolling problem on the b/w monitor we used.
And I have seen that superfo and sirmorris reported similar effects (still?)

So Jens tried another monitor (a nice old-fashoned amber-monochrome one), and there the image was stable.

We looked at the video signal with an oscilloscope and saw that there was no VSYNC in the signal. During the time where VSYNC
is expected, the video signal was at black level, and no HSYNCS during that time. The nice amber monitor was tolerant enough
to accept this for vertical syncronization, but other monitors did not.

From what I understood looking at the schematics and comparing to the original-ZX80-schematics, the vsync bit from U11C/D might not get mixed into the SYNC signal.

So as a quickfix we mixed VSYNC in directly by putting a diode between the /VSYNC bit and the video amplification transistor. This helped to get a stable vertical synchronization on all monitors!

We did not try that, but I would expect that saving data to a tape might currently not work as the VSYNC bit is also not included
in the MIC signal (?). Did anyone try saving to a tape yet?


The second minor adjustment we added was to modify the value of R33. From the oscilloscope, all the video signal levels were
ok but one b/w monitor showed a somehow instable horizontal synchronization. From my experience with
my ZX81-video-output I knew that cheap monitors like a more abundant sync level, and this was what we adjusted with R33.


-oliver

Replies: 4
Views: 4218
Last Post By: gus ON: Wed Jul 28, 2010 10:33 pm
Topic By: gus ON: Mon Jul 26, 2010 11:04 pm
Hi Bruno !!!

First of all like to say you again Thanks for share this material with us !!!

So I can ask you a favor: In the Sinc Times Newsletter September/October 1984; vol. 3 no. 5 on pages 20, 21 and 22 there is an Article called Sprite maker, I will be happy to type it in because I think that this is a good piece of code. the problem is that on page 21, the hexadecimal listing is imposible to read, well almost for me
If you can get a better copy of just this page, the 21, we can recover this program

Thanks in advance,
Gus

Replies: 2
Views: 43
Last Post By: gus ON: Wed Jul 28, 2010 10:41 pm
Topic By: iturbez ON: Mon Jul 26, 2010 11:00 pm
Gus:
¡Un saludo desde el otro lado del charco!
Esto del Zeddy es universal.

For all the members:
Greetings from across the pond
Zeddy is universal!

I'm spanish, so I'm sending greetings in Spanish.

Replies: 2
Views: 43
Last Post By: gus ON: Wed Jul 28, 2010 10:41 pm
Topic By: gus ON: Mon Jul 26, 2010 7:59 pm
Hello,

I'm trying to collaborate in the preservation of the zx81 related material.

Well I buy some time ago, a lot of books and mags about zx81. Living on Argentina on the 1984 makes very hard to find magazines or books about this topic... so I do discover all the printed material years latter in fact I do read the Sinclair User, Micro Sistemas, between a lot of other good mags and all the books that I can found right now, from 2004 to present

I have a small Brochure that I never saw in digital form and then I scanned in order to share it with other zx81 users and collectors.


http://pp.bytemaniacos.com/SinclairZX81SoftwareCatalogue.pdf
Gus

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: zx81jens ON: Sun Jul 25, 2010 9:52 pm
ooops, i forgot some ZX80-programs

greetings
jens

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: KnightFire ON: Sun Jul 25, 2010 5:54 pm
Many thanks for the info!
Please keep the chit chat coming guys, I feel like I'm in a null void without it.

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: zx81jens ON: Sun Jul 25, 2010 5:39 pm
hello again!

after a very good ZX-day here are the results of the work from KLAUS - he transfred the ZX80-tapes via LOAD/SAVE form BODO to harddisk.

the files in the zip are copy´s from the original tapes from "IMAGE COMPUTER PRODUCTS" - i will send the scan´s of the instructions in the near future...

have fun with the ZX80

greetings
jens

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: zx81jens ON: Sun Jul 25, 2010 4:14 pm
hi guys!

OLIVER is here (together with KLAUS, who is in my kitchen and who copying some original-ZX80-programs to harddisk - via LOAD/SAVE from BODO WENZEL).

i think, this ZX80-LEGACY is serial number #4 thank you, OLIVER.

from OLIVER @LEE : very great piece of work - an the design ist also great! there are only some miner glitches that required an oszilloscope

how we (he) did it:

the 74LS74 (U18) was defect - after replacing we had a cursor, but the picture was (like the others before) "running".
then we found out that the signal (Q2 - U11-PIN8) was not correct and after putting in a diode (1N4148) the signal was good, but not perfect. i have several monitors to test - i get the best signal with an old surveillance monitor... my simple and small TV/MONITOR (5,-€) didn´t work so well.
after changing R33 to 500 Ohms everything is working!

the heat is a small problem - i will replace the LS into HCT - that will be better.

the original Z80-CPU was replaced by a Z80 (CMOS-type) and this will reduce the heat.

OLIVER did a lot of work! i did the cooking and refill the glasses

KLAUS has already digitized all ZX80-original-tapes that i own - so you will find them here in my next post...

here you can see a picture from the final:

greetings
jens

P.S.: next saturday i will drive to PAUL (serial #3) - so we can compare the two ZX80

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: zx81jens ON: Fri Jul 23, 2010 10:06 pm
well, yes, i thought about that, too (PAUL told me before also) - all jumpers are set (5-6/47-48/49-50) - nothing...

there has to be another problem...

all my computers (the ZX81-kit, the APPLE I from VINCE BRIEL and the TL801, my italian ZX80-replica) were build like my motto: put it together and switch it on... they worked (exept for a defect ROM on the TL801). the ZX80-LEGACY is the first one with a problem i can´t solve in the first place.

anyway - it will work!

thank´s for the advice

greetings
jens

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: sirmorris ON: Fri Jul 23, 2010 9:11 pm
Jens - I'm sure you already know but it's worth asking if you put the required 3 jumpers on the appropriate pins of the 50 way expansion connector?

Without ar least one of these jumpers there will be no video signal. The information is in the manual but it's easily missed.

Charlie

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: zx81jens ON: Fri Jul 23, 2010 5:45 pm
hi to all!

well, my ZX80-LEGACY is fully assembled and... not working ... there is just a blank screen and i can´t find the mistake!

i have a problem with the 5V-line - it doesn´t come thru to some points... but a solution is near, because OLIVER will come to my house on sunday.

i will also drive to PAUL on the 31. of Juli !!

so there will be a lot of fun for the next few weeks

many greetings
jens

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: Paul ON: Fri Jul 23, 2010 1:48 pm
Neither good nor bad.
At the moment 4 out of 5 Boards are completely built.
One does not work (Jens), it gives no signal to the screen, there will be further investigation this weekend.
Two work with the known error of the keyboard.
SirMorris replaced the diodes with no effect.
My board still works fine.
I cannot save and load data because I don't have a working cassette recorder with mic input, only with line in.
The signal is to weak for line in.
I don't own cassettes with programs for zx80 or zx81, so I cannot test the loading as well.
Without the possibility of saving and loading, i don't like the idea of typing in big test programs.
Hopefully the board of Jens will be running by the end of sunday.
If it isn't, he's planning to come along on the 31st. Then he might bring cassettes and recorder to test, and we might be able to get his board running.
Lee is still working hard on his board and his manual.
Meanwhile, has anybody good suggestions for a simple way of loading/saving software to the zx80 to test using a pcs audio equiment? As I only have several macs and one Netbook, I dont own a parallel or serial port. Do usb to serial converters work for transfering data to the zeddy?
I just think about using eightyone as a source, create a file with the test program and burn it to my eeprom from 8 to 16 k.
Any tipps on how to do this in practice?

Greets Paul

Replies: 107
Views: 4589
Last Post By: sirmorris ON: Wed Jul 28, 2010 8:19 pm
Topic By: KnightFire ON: Fri Jul 23, 2010 7:11 am
This forum topic has been very quiet, is no news good news?

Replies: 16
Views: 344
Last Post By: Shaun_B ON: Fri Jul 23, 2010 2:11 am
Topic By: Shaun_B ON: Fri Jul 23, 2010 2:11 am
Sure, I might have a better quality one too. Just link through to the Museum's website if you could please?

Many thanks,

Shaun.

Replies: 25
Views: 795
Last Post By: yerzmyey ON: Thu Jul 22, 2010 10:29 pm
Topic By: yerzmyey ON: Thu Jul 22, 2010 10:29 pm
I would also add a few words: I would never think it's possible to fit such an interesting labyrinth/logic game into 1K. It's more like a magic actually, for an oridinary user.
Another thing is if I can play the game or not (I die in 4th level or so ), but still - it's an incredible thing. Hm.
Byez,
Y

Replies: 16
Views: 344
Last Post By: Shaun_B ON: Fri Jul 23, 2010 2:11 am
Topic By: Thunor ON: Thu Jul 22, 2010 10:26 pm

Shaun_B wrote:This game is now playing at the National Museum of Computing (http://www.tnmoc.org) at Bletchley Park, which is open twice a week on Thursdays and Saturdays. See attached images

Included on the tape I built for the exhibit is QFrogger, DOMIN8TR1S, Chopper Drop 3000 and QRobot, so should you visit, you'll have a nice selection of software to choose from.

Regards,

Shaun.

Replies: 16
Views: 344
Last Post By: Shaun_B ON: Fri Jul 23, 2010 2:11 am
Topic By: Shaun_B ON: Thu Jul 22, 2010 9:56 pm
This game is now playing at the National Museum of Computing (http://www.tnmoc.org) at Bletchley Park, which is open twice a week on Thursdays and Saturdays. See attached images

Included on the tape I built for the exhibit is QFrogger, DOMIN8TR1S, Chopper Drop 3000 and QRobot, so should you visit, you'll have a nice selection of software to choose from.

Regards,

Shaun.

Replies: 25
Views: 795
Last Post By: yerzmyey ON: Thu Jul 22, 2010 10:29 pm
Topic By: Shaun_B ON: Thu Jul 22, 2010 9:45 pm
This game was mentioned this week in Micro Mart magazine

Regards,

Shaun.

Replies: 16
Views: 344
Last Post By: Shaun_B ON: Fri Jul 23, 2010 2:11 am
Topic By: Thunor ON: Thu Jul 22, 2010 8:04 pm

Shaun_B wrote:Thanks for the updated image. I found printing it at around 55% of the images size is just about right for a typical cassette box (see photo of my '81 at home).

Regards,

Shaun.

Replies: 11
Views: 3682
Last Post By: XavSnap ON: Thu Jul 22, 2010 1:01 pm
Topic By: XavSnap ON: Thu Jul 22, 2010 1:01 pm
Hi,

Ther's a mysterious ASM Code !

Basic:

Code:

# DISPLAY EXEMPLE
# ><AVSNAP
# ®®®®®®®®®®®®®®®®®
# FOUND IN ORDI-5 n2
# PAGE 29
# AUTHOR :
# ERIC WEINSTEIN.
# ®®®®®®®®®®®®®®®®®

     1  REM [HEX:\
0E,21,3E,06,C6,02,47,CD,\
18,09,CD,9B,09,12,FD,34,\
3A,2A,0C,40,23,16,06,ED,\
B1,15,20,FB,54,5D,ED,B1,\
C3,5D,0A ]

     7 POKE 16536,6
     8 POKE 16517,6
    10 LET I=1
    50 DIM N$(50,16)
    55 FOR A=1 TO 50
    60 LET N$(A)=VAL A + "HELLO"+ VAL A
    70 NEXT A
    90 FOR I=1 TO 50
    96 RAND USR 16514
    98 PRINT N$(I);"(";I;")"
   100 NEXT I
  8999 STOP
  9000 SAVE "AUTO-SCROLL"

Code:

#define ORG  .org       ; TASM cross-assembler definitions
ORG $4082
   LD C,$21
   LD A,$06
   ADD A,$02
   LD B,A
   CALL $0918 ; [LOC-ADDR]
   CALL $099B ; [ONE-SPACE]
   LD (DE),A
   INC (IY+58)
   LD HL,($400C) ; GET D-FILE
   INC HL
   LD D,$06
Lb4099:
   CPIR
   DEC D
   JR NZ, Lb4099 ; [$4099:16537]
   LD D,H
   LD E,L
   CPIR
   JP $0A5D ; [RECLAIM-1]

.end

Replies: 25
Views: 795
Last Post By: yerzmyey ON: Thu Jul 22, 2010 10:29 pm
Topic By: Malcohol ON: Thu Jul 22, 2010 8:50 am

Shaun_B wrote:Lisa has nearly finished this amazing 1K game - I think she loves and hates it in equal doses.

Regards,

Shaun.