PCem v11 released

I haven’t had time to follow it, but great news!

PCem v11 released. Changes from v10.1 :

  • New machines added – Tandy 1000HX, Tandy 1000SL/2, Award 286 clone, IBM PS/1 model 2121
  • New graphics card – Hercules InColor
  • 3DFX recompiler – 2-4x speedup over previous emulation
  • Added Cyrix 6×86 emulation
  • Some optimisations to dynamic recompiler – typically around 10-15% improvement over v10, more when MMX used
  • Fixed broken 8088/8086 timing
  • Fixes to Mach64 and ViRGE 2D blitters
  • XT machines can now have less than 640kb RAM
  • Added IBM PS/1 audio card emulation
  • Added Adlib Gold surround module emulation
  • Fixes to PCjr/Tandy PSG emulation
  • GUS now in stereo
  • Numerous FDC changes – more drive types, FIFO emulation, better support of XDF images, better FDI support
  • CD-ROM changes – CD-ROM IDE channel now configurable, improved disc change handling, better volume control support
  • Now directly supports .ISO format for CD-ROM emulation
  • Fixed crash when using Direct3D output on Intel HD graphics
  • Various other fixes

Thanks to Battler, SA1988, leilei, Greatpsycho, John Elliott, RichardG867, ecksemmess and cooprocks123e for contributions towards this release.

Downloads are available for Windows & Linux.

Style & Diction

While looking at some old picture of a 3B2, I remembered in college we used to use this ‘fine’ system for it’s Writer’s Workbench which revolved around the programs style & diction.

I thought it’d be interesting to see if I could track down the source, however the sources seem to have been part of the AT&T DWB package, and were not included in any of the seemingly numerous available Unix sources available on TUHS.  But thanks to this post on the TUHS mailing list, I saw this:

I know about style and diction which was shipped with BSD4.1
which (again wooly memory) was an early subset of the
whole wwb package.

Going with this, I pulled out the recently unearthed images on bitsavers of 4.1_BSD_19810710, and in the tape images sure was the source!  The only date in there is from 1979!

Deroff Version 2.0    29 December 1979

Which for a 1981 tape sure would be in the same light.  So with some fun playing with the makefiles, I had it running on Debian 8 x64!  So with a little bit of kicking I have it running on Windows via MinGW.

So for a fun example, I though I’d take Bill Gate’s forward on Inside OS/2:

 

      OS/2 is destined to be a very important piece of software. During the
 next 10 years, millions of programmers and users will utilize this system.
 From time to time they will come across a feature or a limitation and
 wonder why it's there. The best way for them to understand the overall
 philosophy of the system will be to read this book. Gordon Letwin is
 Microsoft's architect for OS/2. In his very clear and sometimes humorous
 way, Gordon has laid out in this book why he included what he did and why
 he didn't include other things.
      The very first generation of microcomputers were 8-bit machines, such
 as the Commodore Pet, the TRS-80, the Apple II, and the CPM 80 based
 machines. Built into almost all of them was Microsoft's BASIC Interpreter.
 I met Gordon Letwin when I went to visit Heath's personal computer group
 (now part of Zenith). Gordon had written his own BASIC as well as an
 operating system for the Heath system, and he wasn't too happy that his
 management was considering buying someone else's. In a group of about 15
 people, he bluntly pointed out the limitations of my BASIC versus his.
 After Heath licensed my BASIC, I convinced Gordon that Microsoft was the
 place to be if you wanted your great software to be popular, and so he
 became one of Microsoft's first 10 programmers. His first project was to
 single-handedly write a compiler for Microsoft BASIC. He put a sign on his
 door that read

         Do not disturb, feed, poke, tease...the animal

 and in 5 months wrote a superb compiler that is still the basis for all our
 BASIC compilers. Unlike the code that a lot of superstar programmers write,
 Gordon's source code is a model of readability and includes precise
 explanations of algorithms and why they were chosen.
      When the Intel 80286 came along, with its protected mode completely
 separate from its compatible real mode, we had no idea how we were going to
 get at its new capabilities. In fact, we had given up until Gordon came up
 with the patented idea described in this book that has been referred to as
 "turning the car off and on at 60 MPH." When we first explained the idea to
 Intel and many of its customers, they were sure it wouldn't work. Even
 Gordon wasn't positive it would work until he wrote some test programs that
 proved it did.
      Gordon's role as an operating systems architect is to overview our
 designs and approaches and make sure they are as simple and as elegant as
 possible. Part of this job includes reviewing people's code. Most
 programmers enjoy having Gordon look over their code and point out how it
 could be improved and simplified. A lot of programs end up about half as
 big after Gordon has explained a better way to write them. Gordon doesn't
 mince words, however, so in at least one case a particularly sensitive
 programmer burst into tears after reading his commentary. Gordon isn't
 content to just look over other people's code. When a particular project
 looks very difficult, he dives in. Currently, Gordon has decided to
 personally write most of our new file system, which will be dramatically
 faster than our present one. On a recent "vacation" he wrote more than 50
 pages of source code.
      This is Gordon's debut as a book author, and like any good designer he
 has already imagined what bad reviews might say. I think this book is both
 fun and important. I hope you enjoy it as much as I have.

First we run it through style which will give the overall report on the text.

D:\diction\bin>style.cmd forward.txt
readability grades:
        (Kincaid)  9.1  (auto)  9.2  (Coleman-Liau)  8.8  (Flesch)  8.5 (64.8)
sentence info:
        no. sent 31 no. wds 607
        av sent leng 19.6 av word leng 4.43
        no. questions 0 no. imperatives 0
        no. nonfunc wds 338  55.7%   av leng 5.58
        short sent (<15) 35% (11) long sent (>30)  13% (4)
        longest sent 35 wds at sent 14; shortest sent 7 wds at sent 5
sentence types:
        simple  39% (12) complex  32% (10)
        compound   3% (1) compound-complex  26% (8)
word usage:
        verb types as % of total verbs
        tobe  33% (26) aux  22% (17) inf  13% (10)
        passives as % of non-inf verbs   6% (4)
        types as % of total
        prep 8.6% (52) conj 4.1% (25) adv 7.1% (43)
        noun 23.9% (145) adj 14.7% (89) pron 8.4% (51)
        nominalizations   0 % (3)
sentence beginnings:
        subject opener: noun (6) pron (5) pos (2) adj (3) art (3) tot  61%
        prep  19% (6) adv   6% (2)
        verb   0% (0)  sub_conj  13% (4) conj   0% (0)
        expletives   0% (0)

So that places it on the grade 9 level, average readability.

Now let’s see about usage errors with diction!

D:\diction\bin>diction forward.txt
      os 2 is destined to be a[ very ]important piece of software.

 during the  next 10 years  millions of programmers and users will[ utilize]
 this system.

 the best way for them to understand the[ overall ] philosophy of the system
 will be to read this book.

 in his[ very ]clear and sometimes humorous  way  gordon has laid out in this
 book why he included what he did and why  he didn t include other things.

       the[ very ]first generation of microcomputers were 8 bit machines
 such  as the commodore pet  the trs 80  the apple ii  and the cpm 80 based
  machines.

 built into almost[ all of ]them was microsoft s basic interpreter.

 unlike the code that[ a lot of ]superstar programmers write   gordon s source
 code is a model of readability and includes precise  explanations of algorithms
 and why they were chosen.

[ in fact ] we had given up until gordon came up  with the patented idea described
 in this book that has been referred to as   turning the car off and on at
 60 mph.

[ a lot of ]programs[ end up ]about half as  big after gordon has explained
 a better way to write them.

 when a particular project  looks[ very ]difficult  he dives in.

number of sentences 34 number of hits 11

As you can see, Bill likes very, very much.

Explain can give you examples of what to use instead, so how about ‘a lot of’?

D:\diction\bin>bash explain
phrase?
a lot of
use "many" for "a lot of"
phrase?

Explain is a sed script, so in this case I’m using MinGW’s MSYS environment to run the script.

I don’t think much of anyone will care about text processing utilities from the 1970’s in 2016 (and beyond) but for anyone else who is bored, or found out about this by mistake, here you go!

diction.7z

You’ll get a 404 page, just read the error page for the password.

Dungeon 2.5.6 on MacOS

Years and years ago I had bought this copy of Language Systems Fortran for MacOS with the intention of using my Quadra to build Dungeon for MacOS.  Except I couldn’t figure out the first thing about MPW, and life was always busy and I never did figure it out.  Well after getting GCC to compile something on MacOS, I thought I’d dig up some images I made of the disks, and without the benefit of having the manuals anymore see if I could figure it out.

FORTRAN Dungeon 2.5.6 on MacOS

FORTRAN Dungeon 2.5.6 on MacOS

And much to my amazement it compiled without any real issues.  All the EOF markers in the files had to be fixed up, and gdt.f for some reason was mangled at the end, but it was trivial to repair.  I didn’t bother trying to integrate the gettime call, so the clock and any clock events don’t work correctly.  I guess I should make the seconds increment by 15 between calls, or something.  Oh well I don’t think anyone will really care.  I compiled it for the 68020 with 68881 hooks, although I doubt it even makes any calls.  It runs for me.

If anyone cares, the binary is here:dungeon-2.5.6-m68k-MacOS.sit

As always, you’ll have to read the 404 screen to get the download.

Captain Blood reverse engineering project

I found this the other day, and I thought it was pretty damned impressive.

Fractal viewer in C#

Fractal viewer in C#

Kroah has taken the time to reverse how the fractals worked in Captain Blood.  From bringerp.free.fr:

The procedural terrain generator uses 1D fractional brownian motion (fBm) with random mid-point displacement. Up to 10 curves are displayed on screen.

When a new curve appears at the horizon, 7 vertices are computed. Then mid-point displacement with fBm are applied to thes 7 initial points. This results in a discrete curve of 512 samples.

The random number generator and the fBm Hurst parameter H are adapted according to the current terrain type (flat, canyon…). This gives very different visual landscapes (plains, moutains, desert…).

No more fractal computation is done on the discrete curve. When a curve is drawn, only 256 of the 512 samples are used (according to the position of the Oorxx).

The view is 256 pixels wide, so if the visible part of the curve is larger than the 256 samples, the curve will be drawn zoomed with pixels linearly interpolated between the samples. Otherwise the curve will be drawn shrinked without any interpolation and using only some of the 256 samples.

The raytraced fractal landscape is computed from these 10 curves.

It’s pretty amazing to think that there was that much behind the game.

I played this back in 1988 on the lowly Commodore 64, but the Amiga version was simply amazing.  Such was technology back then.

Giving up on the MT-32

What do you mean, giving up?  Well I’ve been trying to buy one, and I’ve lost every auction.  So I figured I’d check up the emulation scene and see what is up.  Then I heard this video:

And this one.

Notice anything?

Or at least to my ears, MUNT, sounds the same as the real thing!

So, how to use the thing?  Well in Windows Vista onward (8/8.1/10..) Microsoft decided to hide the MIDI selection tools, making this a mission to see what mapper you are using.  But using DOSBox it’s easy to see which is which.  In DOSBox run:

mixer /listmidi

0 “CoolSoft VirtualMIDISynth”
1 “Microsoft GS Wavetable Synth”
2 “MT-32 Synth Emulator”

In this case the MT-32 emulator is #2 on my system.  Then to select this device, just type in:

midiconfig 2

And you are in business!  Fire up the UI and you’ll see:

DOSBox active on MUNT.

DOSBox active on MUNT.

Then configure your application for ‘general MIDI’ on port 0x330, and you should be good to go!

DOSBox DOOM v1.1 general midi

DOSBox DOOM v1.1 general midi

And, how does it sound?

Now for comparison, here is E1M1 with VirtualMIDISynth with SGM-V2.01 sound font.

It’s impressive when you put them next to say the Adlib.

So maybe it was a good thing I kept on losing the auctions… But it’d still be neat to drive a real MIDI peripheral on a modern machine.  Maybe I’ll win, one day.

GCC 1.37 on MacOS

I didn’t even know there was such a thing!

But sure enough, the file GNUMPW.SIT, and the later gcc-1.37.1r15-all.sea.bin are the real thing!  The file GNUMPW unstuffs to GCC 1.37.1r7(All), although Stuffit 5 and higher won’t unpack the file, I’ve converted it unpacking with version 4 & repacking with 5.5.

The readme from r7 is dated November 2nd, 1990.  I found some history on this port on the archives of the GCC mailing list here.  The port was done by Stan Shebs, while working for Apple.  As he states the port started in 1989 and was first used in an abandoned m68k based project, and later a possible replacement for the Apple compiler for OS 7.

For this experiment I was using the r15 version, as I didn’t find anything out about the prior versions until after I had written this.

GCC on MacOS needs the MPW environment, which for me is incredibly awkward to work with. While some people may love it, it is very strange in that you have to highlight commands in the window, then hit clover+enter to run them.  Like a mainframe, you can input commands wherever in the screen.

The next hardest thing was finding a version of MPW that will work with this.  It needs the MPW C compiler for it’s includes, and libraries.  The 3.5 stuff didn’t seem to work for me, however doing a LOT of searching, and I did find a ‘toast CD-ROM’ image‘ of 3.1 that includes all the C, and Assembler tools that I need to build an executable.

I also don’t know why, but running make just shows me what needs to be done, it never actually makes anything.  I’m probably doing something wrong, but for such a long dead tool, trying to find out how to use it, or how do you interrupt a “stream” like manually running cc1 is beyond me.  I just have to force quit the emulator.

But beyond that, running make gives me the steps, and I manually select and run the steps, and I was able to get a program to run!

xxx

sieve

I know it may not look like much but getting it to actually run something was quite monumental for me!

I thought for the hell of it, I’d try to build the InfoTaskForce 1987 interpreter, but it seems to get confused at the whole input method.

Planetfall on MacOS

Planetfall on MPW

There were some issues compiling input.c, as it didn’t like the external table, so I made it’s own local table.  It also didn’t like some pointer arithmetic, but making GCC happy only gives me a program that can’t recognize any verbs.  And from there it won’t quit, basically hanging the system.

I’m sure I’m doing something wrong, but at the same time it was interesting to see GCC on MacOS, during the whole GNU boycott of Apple for the ‘look and feel’ lawsuit against Microsoft.  No doubt it let a lot of people sell other C compilers on the Mac Platform during this window of time.

GCC requires a 68020 processor, as GCC’s native 68000 based target would be SUN-2 hardware.  While it can compile with the -m68000 flag, I haven’t tested with a 68000 based emulator to see if that’s even true. Â In the off chance someone wants a combined MPW+GCC I made a disk image here: MPW 3.1 with GCC 1.37.img.gz.  Disk Copy 6.3 should be able to mount it OK, or any emulator that likes HFS disk images.

Sega Genesis/Mega Drive emulation got a massive overhaul on steam

And I don’t just mean supporting ROM hacks, and mods, I mean this is what the new Genesis & Mega Drive Classics UI looks like:

SEGA themed bedroom

SEGA themed bedroom

First off as you can see, it’s a room.  The kind of place any SEGA nerd of the late 1980’s and early 1990’s would of course dream to own, with wall posters, sonic rug, eco toys, and of course a nice library of games and a tube TV set.

Instead of the old boring menu, you now get to choose titles off the shelf, and it’ll automatically drop them into the console.  Maybe we will get manuals rendered next?

Chose a game

Chose a game

While it is dark, it does offer a ‘time of day’ so you can watch the procession of the virtual sun in your bedroom.  I guess it speaks that we don’t get to go outdoors enough, but now we can be trapped into a virtual bedroom as well.  With our game selected, we can turn up the curvature of the tube, or even enable scanlines for that old feel..

Alien Storm

Alien Storm

The emulator is VERY demanding, there is no mistake about that.  While the classical interface was unique for the time, but it also had issues like making you scroll one at a time through the games.  As always you can buy this on steam.  A nice touch is the latest update adds in many controllers and pads.

So what is missing? The MegaCD.  The 32x.  Saturn, Dreamcat heck even the master system are suspiciously absent.  One day I suppose.  Will this hub turn into something that 3rd parties can release Genesis/Mega Drive titles onto?  Is this the start of the virtual console?

Or just a flashy UI.  I guess time will tell.

Ported System16 0.53 to Windows

To be honest, it was about 30 minutes worth of work to jump from Allegro 2.11 to Allegro 4.2.  I’ve never used it before, but the only ‘gotcha’ was how they handle the main to WinMain for linking.

At the end of your main procedure, you need to place the following code:

END_OF_MAIN()

And that is it! No semicolon either!

Last night I was playing with Musashi, and actually had the ‘demo’ program loading up the Altered Beast program, and running.  I just put in the memory areas to let it have read only to the ROM space, read write to the memory addresses, and write only to the IO ports.  It was enough for it to lock up in an endless loop like this:

E 3990: 4a38 f01c           : tst.b   $f01c.w
E 3994: 67fa                : beq     3990

Well some digging around and I found these vague hints:

Some special bytes:
F018: if bit5 is set 1, the screen is not updated
F01C: Timer ?
TimerA=&RAM[0xFF][0xF01C];
TimerB=&RAM[0xFF][0xF01E];

So it looks like it’s waiting for a shared memory value to be set to a ‘1’, so I setup the IRQ to include this nice hack:

offset=0x00FFf01c-0x00FF0000;
WRITE_BYTE(g_ram, offset,1);

And we were away.

So I thought I’d try to make the big step, as System16 v0.53 uses an ancient version of the UAE Amiga emulator, somewhere between 0.4 and 0.6, I think.  Anyways I was hoping to expand more and more functionality, and one thing SEGA did love to do was add more and more processors into their designs with some boards sporting up to three 68000 processors.  And Musashi can support multiple processors so, it seemed like a good fit.

So I amputated the UAE code, and tried to see how many functions System16 calls out from UAE, and it isn’t that much.  Most calls involve setting up emulation, and executing a single instruction. System16 handles all the memory access, Interrupts, and I/O.  So a few hours of bashing away I got it to link, and was greeted with a nice black screen.  I did remember that when I was first playing with the code, that even though the CPU was executing instructions nothing would be drawn without the external interrupt.  So I googled around and found another emulator, Virtual Jaguar, that also uses the Musashi 68000 CPU core.

So I could take the old UAE way of executing an interrupt from this:


void inline Exception(int nr, CPTR oldpc)
{
MakeSR();
#ifdef DEBUG_INT
TraceOn();
printf("Exception %0x, valeur = %0x, pc = %0x\n", nr, oldpc, m68k_getpc());
printf("Valeur de r�gistre SR = 0x%0x\n", regs.sr);
#endif
if(!regs.s) {
regs.a[7]=regs.isp;
regs.s=1;
}

regs.a[7] -= 4;
put_long (regs.a[7], m68k_getpc ());
regs.a[7] -= 2;
put_word (regs.a[7], regs.sr);
m68k_setpc(get_long(regs.vbr + 4*nr));

#ifdef DEBUG_INT
printf("VBR=%08x , NR=%d , I=%04x \n", regs.vbr, nr, regs.vbr+4*nr);
if (strace) printf("int jump 0x%0x\n", regs.pc);
#endif

regs.t1 = regs.t0 = regs.m = 0;
}

To this:


void inline Exception(int nr, CPTR oldpc)
{
unsigned int sr = m68ki_init_exception();
unsigned int newPC = cpu_read_long(nr<<2);

m68ki_stack_frame_3word(m68k_get_reg(0L, M68K_REG_PC),sr);
m68k_set_reg(M68K_REG_PC,newPC);
}

A quick recompile, and it was running!

Now with that in play, I went ahead and dumped all the old code, and the old Allegro, and went through re-building with Allegro 4.2 on Windows.  It didn’t take that long, I was really impressed!  At the same time I didn’t improve on anything in the slightest.

System16 v0.53 on Windows

System16 v0.53 on Windows

This is only a proof of concept, the fun hasn’t even started yet.  If you want a ‘solid’ emulator, go with MAME.  This isn’t anywhere near ready but it is interesting that it is running.  There is much more work to do with this, especially adding a Z80, and YM2151.

You can download the Win32 executable here.  You’ll need your own Altered Beast ROMs, it’s an ancient set, nothing that any recent download will map to.

Burgertime 7/12/2015 aka DooM 3DO port

I found this talk rather interesting!

I didn’t know that the Jag DooM was considered a reference platform.  It’s an interesting talk about the rush job that was 3DO DooM, along with a small talk on fixed point math and other inside information on software development.  It is a little long, just over an hour.