Search found 23 matches

by butchi
Wed Jul 31, 2019 4:59 am
Forum: Hardware
Topic: 8251 USART
Replies: 5
Views: 589

Re: 8251 USART

jdfan1000 wrote:
Tue Jul 30, 2019 7:32 pm
Hi!

Do you know where this came from originally?

Thanks!
jd,

Designed by David Leech from Leesville, SC
He says the 8251 USART is good for 9600 bps.
b
by butchi
Tue Jul 30, 2019 2:41 am
Forum: Hardware
Topic: 8251 USART
Replies: 5
Views: 589

8251 USART

Hi,
This is the backbone of the Byte Back Modem, activated by logic gates to test individual bits of an entire byte.
b
* docs attached *
by butchi
Tue Jul 09, 2019 4:41 am
Forum: Software
Topic: Crippled Software*SOLVED*
Replies: 19
Views: 1928

Re: Crippled Software

This is a problem with ZXPand not the program. When generating standard ZX81 type characters SHREB expects to find the character patterns at $1E00, which are are no longer there because of the ZXPand overlay ROM. Pseudo-hi-res programs also have a similar problem. Try loading the program with the /...
by butchi
Mon Jul 08, 2019 9:00 pm
Forum: Software
Topic: Crippled Software*SOLVED*
Replies: 19
Views: 1928

Re: Crippled Software

Here it is with SHREB version 3. I haven't actually tried to figure out how the use the program, but the screen shot shows that SHREB version 3 is working. Regards; Greg Greg, The SHREB version 3 appears to handle Tom's SE graphics, but not regular text. If you know the subtlety between 2 and 3, pl...
by butchi
Mon Jul 08, 2019 8:07 pm
Forum: Software
Topic: UnLock Software*SOLVED*
Replies: 11
Views: 988

Re: UnLock Software

mrtinb,
ZXpand did the job, thx!
Now, the attached >16K file ZXpand SAVEd, will not LOAD via EO tape, only ZXpand CAT.
What's the trick to get EO tape/wav to LOAD it, as well :?:
b
* how many P standards exist *
by butchi
Mon Jul 08, 2019 2:22 am
Forum: Software
Topic: UnLock Software*SOLVED*
Replies: 11
Views: 988

Re: UnLock Software

If you have a ZXpand, you can load the software with LOAD “SOFTWARE STOP ”, where STOP is a keyword. ZXpand emulation is available on EightyOne as well. If you have real hardware with tape loading, I’ve read you can load with RAND USR 836 to stop auto-run. (This I’ve never tried myself.) mrtinb, Th...
by butchi
Sun Jul 07, 2019 9:56 pm
Forum: Software
Topic: UnLock Software*SOLVED*
Replies: 11
Views: 988

UnLock Software*SOLVED*

Hi,
ZX software that auto-runs, after loading, has more of a chance to fail.
Q: Can auto-run code be unlocked in some way, so only the binary gets installed without it being launched :?:
b
by butchi
Sun Jul 07, 2019 1:33 am
Forum: Software
Topic: ZX Utility Query*SOLVED*
Replies: 16
Views: 1450

Re: ZX Utility Query

Merge 32kb version (only 20kb Basic memory available): Ram_Top @ 49999 TODO: Move the Ram_Top : POKE 16388,200 POKE 16389,175 NEW LOAD "MERGE32" LOAD the Program#1. RAND USR 45030 LOAD the Program#2 RAND USR 45000 Type LIST. [Tested on EO] Merge32.TZX MERGE32.P XavSnap, What I've noticed, one EO ve...
by butchi
Fri Jul 05, 2019 8:13 pm
Forum: Hardware
Topic: ZX EPROM Programmer Port
Replies: 6
Views: 677

Re: ZX EPROM Programmer Port

dessony wrote:
Wed Jul 03, 2019 7:13 am
Does this device use an 8255 IC?

DesSony
dessony,
Yes, and here is the schematic to see how the hardware is wired . . .
b
by butchi
Fri Jul 05, 2019 5:56 am
Forum: Software
Topic: Crippled Software*SOLVED*
Replies: 19
Views: 1928

Re: Crippled Software

Here it is with SHREB version 3. I haven't actually tried to figure out how the use the program, but the screen shot shows that SHREB version 3 is working. Regards; Greg Greg, It appears that the P file format is very unstable when the file exceeds 16K. Here is an example where EO can generate only...