"wall" game for the Lamba 8300 / Power 3000

[mrtinb]

Few people have the color module. But Kai from ZX Team has made a schematic of it. So maybe one day a replica is made. It should work both for Lambda 8300 and ZX81.

[mrtinb]

The game is MUCH better now. The timing is perfect.

This little video shows the speed.

BEWARE: All the corrupted chars on the screen is not the game's fault.

https://youtu.be/LtdDbik4zxI

(My theory is that ZXpand, which loads the game, has a problem with the Lambda 8300 ULA. Memory from the ZXpand is read and written fine. I assume the ULA has problem reaching it, so it is a timing problem that only occurs with the Lambda ROM. The problem is rarely with ZXpand ROM on Lambda.)

[olofsen]

These extra characters look spectacular

[olofsen]

So here is a little test program for the math functions...

Code: Select all

/* zcc +lambda -O3 -create-app math.c -lmlambda */

#include <stdio.h>
#include <math.h>

unsigned short frames @0x4034;

int main()
{
	int dframes;
	float M_PI2, M_PI4, M_PI6;
	char buf[3];

	dframes = frames;
	
	M_PI2 = M_PI/2;
	M_PI4 = M_PI/4;
	M_PI6 = M_PI/6;

	printf("Running 25 tests...\n");

	printf("%f %f %f\n", asin(1)/M_PI2, acos(0)/M_PI4, atan(1)*2/M_PI6);

	printf("%f %f %f\n", sin(M_PI6)*8, cos(M_PI/6)*10/M_SQRT3, tan(M_PI/6)*6*M_SQRT3);

	printf("%f %f %f\n", 14*sinh(M_PI)/(exp(M_PI)-exp(-M_PI)), 16*cosh(M_PI)/(exp(M_PI)+exp(-M_PI)), 9*tanh(M_PI)*cosh(M_PI)/sinh(M_PI));
	
	printf("%f %f %f %f\n", pow(10,log10(10)), sqrt(121), log(exp(12)), exp(log(13)));

	printf("%f %f\n", fmin(14,15), fmin(16,15));

	printf("%f %f\n", fmax(16,15), fmax(16,17));

	printf("%f %f\n", 18.*(1<2), 19.+(1>2));

	printf("%f %f\n", 20.*(1<=1), 21.*(1>=1));

	printf("%f %f %f\n", floor(22.5), ceil(22.5), fabs(-24));

	ftoa(25.,0,buf);
	printf("%s\n",buf);

	dframes -= frames;
	if (dframes <= 0) dframes += 0x8000;
	
	printf("Done in %d frames.\n", dframes);

	return 0;
}

[mrtinb]

My Lambda 8300 says: 1532.

Two times I have experienced that the screen corruption is gone. Luckily this was one of them.

(When the screen is corrupted, bits near other text is influenced. So this result was 3732, because 1 and 5 was corrupted.)

[mrtinb]

Hi again olufson

Now I've uploaded the TZXduino firmware to my Arduino with SD/Ethernet-shield, and loaded WALL into my Lambda with a 16K RAMpack.

When the ZXpand is removed, the Lambda works flawless.

Can your patches be applied to z88dk, so versions of DSTAR and CROSS-CHASE can be made for Lambda-version1?

[mrtinb]

Can your patches be applied to z88dk, so versions of DSTAR and CROSS-CHASE can be made for Lambda-version1?

Thank you olufson, for Lambda1 versions of DStar and CrossChase. I’ll try them on real hardware tomorrow.

[Fabrizio]

Was my game (CROSS-CHASE) patched?

What was the issue? I can make a permant fix in my tool-chain so that future releases work on all Lambda versions.

[olofsen]

Well actually Lambda related z88dk files were patched to match the "old" Lambda ROM. It will be quite hard to make one binary that runs with the old and new ROM (as well as others). Currently the patched z88dk tree is still in a testing phase and "+lambda" now only compiles for the old ROM...