Commander X16

If we're only using the 6502 commands then there is no point in using the 65816 at all. It isn't just the 32 Rockwell commands we can't use because they won't work on a 65816. We can't use 57 commands that are unique to the 65816 either, because they won't work on a machine with a 65c02. We wouldn'...

So am I supposed to be using 65c02 opcodes or not? Cos I've gotten used to using them. You can use all of the 65C02 opcodes except the RMB/SMB/BBS/BBR opcodes. Those are Rockwell extensions for the 2A03 version of the chip that's in the NES, and they were incorporated into the 65C02 S from WDC (whi...

... Edit for those curious: the time between PHI2 rising edge and $2A appearing on the bus (aka t_MDS ) is 35ns. Given the 5ns resolution of the analyzer and the capacitances of the trace and probes, this aligns reasonably to the 25ns published in the datasheet. Yeah, simply qualifying the WR# and ...

... Your RD# and WR# signals need to be synchronized with PHI2. According to the W5100S datasheet, the parallel bus is sampled when WR# the signal goes low. During a write by the 65C02, the data is not valid until well after RWB goes low. 65C02_Write_Timing.png You want to latch the write value on ...

The real benefits of having them in RomBASIC is that they can be made to be more efficient, like FOR / NEXT, because you can stack information on a structure stack to be completed by the end of the structure and avoid scanning through the program for the target line as with GOTO. But BASLOAD implent...

Thanks Jimmy! Hopefully they'll do another revision of the Otter that doesn't need a bodge but then again, I have no idea what I could use the cartridge slot for? There probably isn't much available in the way of X16 expansions yet are there? There are some in the works: Network, MIDI, and Serial c...

You can also write a ROM segment, which can then be selected by writing the correct value into $0001 in LowRAM. In real life, that requires setting the correct jumper and flashing the ROM, in the emulator it would involve rebuilding ROM.bin ... I think that is described here: https://github.com/X16C...

comal 80 for the x16 would be great. on the c64 there is the wonderful cobol80. The x16 has great properties from the c64. greeting No, thank you. :D I will have to say I find it pretty remarkable that there is such a thing as COBOL on the C64, in any form at all. I do 2nd Edmond's no thank you tho...

Quite. According to one account, some higher up at Commodore asked Microsoft to make the Basic able to handle their salary. Adding the bits to the Microsoft Basic floating point mantissa gave enough range to do that. Somehow, I rather doubt that they'd rely on BASIC to do their payroll. As I unders...

... It's not technically "modified," as it predates the IEEE standard by at least 4 years (it looks like the IEEE 754 standard was first published in a proposal dated 1981 and then ratified in 1985), and Microsoft is responsible for the 5 byte floating point representation since the same ...