OT: Altair32: C arrays and pointers

Hello, all: Futher errors have been found in the Altair32 8080 processor emulator code by some eagle-eyed users. So, I'm trying to fix them, but my lack of depth in C programming has become evident. So, I'd like to enlist some help again. Here's the code (cut and paste; written by Claus Giloi): uchar regs[8] ; // A, F, B, C, D, E, H, L - actual storage order! // 0 1 2 3 4 5 6 7 // pointer array for sss, ddd addressing uchar * b_regs[8]= {&regs[2],&regs[3],&regs[4],&regs[5],&regs[6],&regs[7],&dummy,&regs[0]} ; // B C D E H L trap! ACC // pointer array for rp addressing ushort * w_regs[4] = { (ushort *)&regs[2], (ushort *)&regs[4], (ushort *)&regs[6], &SP } ; // B D H SP As you 8080 users know, several instructions operate on register pairs instead of individual registers. The instruction that began this odyssey was INX H. The INX B/D/H instructions increment the BC, DE, HL pairs. INX SP works. B/D/H don't. While the individual register halves reflect the proper values, the word registers are reversed. I guess it's because when accessing a word value in an array, the CRT code swaps the high-order and low-order bytes. So, I used the following code, which produces the desired result but is what I can only assume to be the sledgehammer way of doing what I want (lots of snipping): // u is the opcode and switch ((u&RP_MASK)>>4){ // RP_MASK isolates register pairs case 2: //HL tmpH = *pH ; // pointer to H storage tmpL = tmpL2 = *pL ; tmpL++; if (((tmpL & 0xff) == 0) && (tmpL2 == 0xff)) tmpH++ ; *pH = tmpH ; // save regs *pL = tmpL ; break ; // other cases omitted. } What I do is manually manipulate the byte registers (watching for rollover) to get the desired result, totally skipping the w_regs array. Bogus I admit, but it works. I can only imagine that there is a better way to do this. So, I'm asking for help finding the better way. Thanks again. Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/