Search found 2059 matches

by dr beep
Mon Mar 18, 2024 7:55 am
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 10
Views: 202

Re: Enhanced ARX True High Resolution Display Driver

Great read, now I need to take a look at the code.
by dr beep
Tue Mar 12, 2024 7:38 am
Forum: ZX BASIC
Topic: 7Eh near end of REM
Replies: 4
Views: 194

Re: 7Eh near end of REM

Why would you edit machinecode? You should always place new versions of your code over the line, but better code outside the ZX81 and built a .P from that. In this way you can use much more of the RAM, like printerbuffer, sysvar and no loss of bytes for line nimbers and lengt or start of machinecode.
by dr beep
Mon Mar 11, 2024 11:12 pm
Forum: GAMES
Topic: New ZX81 Games
Replies: 361
Views: 678915

New 1K Games : HRLBS

Name of Software: HRLBS Author: Johan "Dr Beep" Koelman Release Date: 11/03/2024 Requirements (eg. 1K, 16K, AY Card, Hi-Res Scheme): 1K lowres Commercial / Public Domain / Free ware / Other - please specify? Freeware Description: HRLBS.png Downloadlink: HRLBS.p Source: HRLBS.asm Video https://www.yo...
by dr beep
Sun Mar 10, 2024 10:25 am
Forum: Hardware
Topic: RAM speed issue
Replies: 29
Views: 1075

Re: RAM speed issue

So I've got two partially failed ULAs ... or potentially to be generous, two ULA's that can't perform to the standard where WRX hires graphics will work, even if I was using the original 1k RAM. I think you have bunked why "some" ZX81s did not work with my hiresgames. We wanted to release a tape wi...
by dr beep
Sat Mar 09, 2024 5:51 pm
Forum: Hardware
Topic: RAM speed issue
Replies: 29
Views: 1075

Re: RAM speed issue

I made a simple testprogram out of a game.
HR-test.p
(542 Bytes) Downloaded 4 times

After NEWLINE you will see 16 hires lines (well more, but also lines with zero)

First line 1 and 1
spaceline
Second 2 and 2
spaceline
Third 4 and 4
etc....

So you can see which bit are set by your computer.
by dr beep
Sat Mar 09, 2024 5:40 pm
Forum: Hardware
Topic: RAM speed issue
Replies: 29
Views: 1075

Re: RAM speed issue

Closer look at the picture

First thought:
The text is ok, but some bits are
somehow set.

The best thing you could have is a simple
display with just 1 (adjustable) value and see how that display appears.
by dr beep
Sat Mar 09, 2024 5:08 pm
Forum: Hardware
Topic: RAM speed issue
Replies: 29
Views: 1075

Re: RAM speed issue

msknight wrote: Fri Mar 08, 2024 2:13 pm I'm not dissing the game, or your fine work in any way, shape or manner.
I don't take it in that way.

I can take a look what value from which address must be read/shown if that can help?

Hardware itself I can't help you with.
by dr beep
Fri Mar 08, 2024 3:11 pm
Forum: Hardware
Topic: RAM speed issue
Replies: 29
Views: 1075

Re: RAM speed issue

AFAIK Berzerk is pseudohires
by dr beep
Fri Mar 08, 2024 2:07 pm
Forum: Hardware
Topic: RAM speed issue
Replies: 29
Views: 1075

Re: RAM speed issue

I can tell you exactly what value must be read but not ATM.
Tonight earliest.

I WROTE THE GAME
by dr beep
Fri Mar 08, 2024 1:43 pm
Forum: Hardware
Topic: RAM speed issue
Replies: 29
Views: 1075

Re: RAM speed issue

The lowres display is ok, problem is in the hiresdisplay.