Search found 89 matches

by MonkZy
Fri Feb 23, 2018 1:42 pm
Forum: Programming
Topic: New to machine code...seeking assistance.
Replies: 10
Views: 1151

Re: New to machine code...seeking assistance.

Agreed ralf. I am sure that the problem lies in the DJNZ jumps, it appears to be missing the instruction LD a,(de) in the first loop. I guess working from a hand compiled magazine routine is not a great approach to learning assembly. I think the author wanted 256 cycles on the first loop so started ...
by MonkZy
Fri Feb 23, 2018 12:49 pm
Forum: Hardware
Topic: Capacitors
Replies: 17
Views: 2349

Re: Capacitors

I will check my local Maplin as they apparently have some TCS 50w irons in stock. I am not sure if they are the old type or the new push button models. I like the size of the iron and I already have a good old Antex iron stand, the other stations on offer are far more bulky.
by MonkZy
Fri Feb 23, 2018 12:27 pm
Forum: Programming
Topic: New to machine code...seeking assistance.
Replies: 10
Views: 1151

New to machine code...seeking assistance.

I am taking some very early steps into assembly. I have a task I would like to perform with machine code : 'Paint' a 22x18 character square with attributes stored in memory. It will behave like a double buffer routine but just for colour attributes. I wish to manipulate the attributes stored in memo...
by MonkZy
Tue Feb 20, 2018 2:08 pm
Forum: Hardware
Topic: Capacitors
Replies: 17
Views: 2349

Re: Capacitors

Many thanks for all the great technical advice. I tested my iron on some scrap PCB's and it is woefully inadequate. It takes way longer than the two second melting threshold, on PCBs with thick tracks it is more like 10 seconds it seems. It is a simple 18w Antex iron, without any temperature control...
by MonkZy
Thu Feb 15, 2018 10:16 am
Forum: Hardware
Topic: Capacitors
Replies: 17
Views: 2349

Re: Capacitors

Cheers for the advice. For power I am using a D-SUN DC-DC step down module set to 9V which is powered by a modern (gamecube) 12v supply. The old PSU is long gone. My soldering skills are most likely below average. I really do not want to kill the board with a ham-fisted attempt at removing the old c...
by MonkZy
Wed Feb 14, 2018 11:14 pm
Forum: Hardware
Topic: Capacitors
Replies: 17
Views: 2349

Capacitors

I have just brought a 48k spectrum back to life. So far all I have done is removed the RF circuit and fitted a capacitor to give AV out and replaced the crumbling keyboard membrane. Oh, I also gave its casing and keys a soapy bath. Much fun has been had playing old games, loading them using .wav fil...
by MonkZy
Wed Feb 14, 2018 10:51 pm
Forum: Hardware
Topic: Could Amstrad have made tapes play faster?
Replies: 7
Views: 980

Re: Could Amstrad have made tapes play faster?

I have been playing around with Otla. The tool converts .tzx files into a .wav you can play into a spectrum. I have used it to load the Hobbit into a 48k spectrum in 34 seconds via the regular EAR connection. The baud is lifted from 1200 to 12600 and it works flawlessly. Obviously this rate is way t...
by MonkZy
Thu Feb 08, 2018 3:18 pm
Forum: Announcements
Topic: Introduce yourself!
Replies: 338
Views: 50465

Re: Introduce yourself!

I sure can. First I will polish it some more. I just made a SCREEN$ load page for it. The BASIC is most likely not a good example for folk learning to write nice neat programs, but it works :D
by MonkZy
Thu Feb 08, 2018 1:38 pm
Forum: Announcements
Topic: Introduce yourself!
Replies: 338
Views: 50465

Re: Introduce yourself!

Hello everyone, I had a rubbery spectrum 48k without a tape player in '82. Upgraded from typing to cassette by '83. Eventually killed rubber key with a 12v Lima train PSU that I had forgotten to turn down to 2/3rds on the dial. Got a plus, played many man hours of Elite and equally many man hours mu...