Gigatron Hackers

Interesting. @Phibrizzo : you can save 11 bytes with a single loop. Total: code = 23 bytes, gt1 = 29 bytes. (SMALLEST GT1) * file: phib_chess_c.gt1 0081 00 08 |..| 0083 1a 82 [vCPU] LD $82 |..| 0085 fc 81 XORW $81 ||.| 0087 82 01 ANDI 1 |..| 0089 e3 3f ADDI $3f |c?| 008b f0 81 POKE $81 |p.| 008d 59 ...

1) There is a version of gtmine built into ROMv6 with source code and makefile at https://github.com/kervinck/gigatron-rom/tree/master/Apps/GtMine 2) Some versions of the C compiler were eager to not only use but also statically initialize zero page memory locations (in range 0x36-0x41) that are des...

at67 wrote: ↑20 Mar 2024, 03:47 Max file upload size has been increased to approximately 5MiB.

Thanks at67. It works now.

New release. Linux and Mac users --> clone the github repository at https://github.com/lb3361/gigatron-lcc Windows users --> try the attached precompiled zip. Version 2.4 makes a more efficient use of scratch registers, optimizes a bit more, and produces more compact code. Long multiplication is sub...

I disasembled Your program. You and at67 used very smart trick: if color is biger that 63 then is black. I saw this in at67's code above in this thread. My challenge was to make the C compiler produce the optimal code. Note that a color bigger than 63 is not always black. The vga output only uses t...

Just to see how small it can be using only C and without crashing.

Latest changes: Added opcodes VSAVE and VRESTORE to save or restore a virtual interrupt context, and opcode EXCH to atomically exchange a byte. Together these instructions make it possible to implement preemptive multitasking. See https://forum.gigatron.io/viewtopic.php?t=463 and doc https://github....

Updated code with correct stack alignment.
This matters because glcc-2.4 (about to be released) is more fussy about stack alignment.

Lots of games there. Alas there are so many variations of Basic. In addition, most expect a 40x25 character screen. Porting these games could be a lot of work. See however wbusby's work, https://github.com/kervinck/gigatron-ro ... ib/wbushby

Signal /IE indeed must go low to read the serial register, but this only happens once per video frame, that is, for a single 160ns cycle every 17ms. Whether you would see it depends on the scope trigger capabilities. In addition, if the 74HCT139 U11 was broken, chances are that nothing would work be...