ged, I don't believe only
some 20 people were killed. We'll see
Thank you for your interest...
Alwin Henseler([EMAIL PROTECTED])
from Enschede, the Netherlands
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED]
and put "unsubscribe msx [EMAIL PROT
emulator builder or so and you don't have
this info yet, I suggest you get it from the Yamaha site ASAP.
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED]
and put
dio256.htm
It shows the connections for both 32 KB and 256 KB. sampleRAM to the MSX-Audio
chip, with description.
Pin numbers for the Philips Music Module are indicated, and as shown, has been
used & tested.
Greets, Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/m
x27;t work -> well, you get the idea...
This setup (one big IC) is used in MANY machines.
Exceptions are possible here as well:
You could add your own logic for generating the DRAM control signals, or
you could use SRAM instead
In short: it all depends on your particular machine, and w
in
the source are in Dutch though). It doesn't give PMA format 'specs', but using it
you can fairly easily find out how PMA files are organized.
And for the compression method: although I rewrote lots of the code (reverse
engineered from PMext), I don't even fully understan
ble uses of this word as a verb (Dutch: werkwoord)
or as an adjective (Dutch: bijvoeglijk naamword)
Just so that you know it
Greets, Alwin Henseler ([EMAIL PROTECTED])
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED]
and put "unsubscribe msx [EMAIL PROTECTED]&qu
ease mail!!
>
how about 'F2 Spirit' ?
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED]
and put "unsubscribe msx [EMAIL PROTECTED]" (without the quotes) in
the body (not the subject) of th
ly suggested that maybe you could use this effect. Maybe you
can find a description of the exact behaviour on Sean Young's pages
(http://www.msxnet.org).
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
MSX Mailinglist. To unsubscri
h the mapper using a single
> interface.
That would be perfect!
I think that DOS2 and its mapper support are essentially 2 separate
things. Although I'm not sure if DOS2 itself could work without its
built-in mapper support. But the other way round: why not?
You might even include this
his bit, re-enabling the
functions AS THEY ARE FOR THE MEGARAM.
So this extra 1-bit register wouldn't get involved in normal megaRAM
control, but only toggle between "disable normal megaRAM functions"
and "enable normal megaRAM functioning".
Ok, it would take some more ele
puts: yes
If the Z80's IORQ signal is not on one of the inputs: no
(IORQ = Z80 pin 20)
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put
in the bod
ge is the connector. I think
the required data is in the Ultimate MSX FAQ (www.faq.msxnet.org).
Alwin Henseler([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put
in the body (not sub
Are you sure that
is enough? (try making far bigger, and see if still crashes)
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put
in the body (not s
s is technically not allowed , but who cares)
Multiple mappers not allowed? Says who? Says what? Why not?
There are some machines that have a hardware-problem with it, but
that's more like a mistake in the design of those machines (like the
Turbo-R with >512K external mapper).
G
ymore, if you add another MHz. to the turbo clock speed.
Examples: the mouse, HD interfaces, fast diskROMs, etc. etc.
Why have this much trouble, for so little gain?
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
MSX Mailinglis
l handbook
clearly reads:
minimum, required: 64 K RAM
memory mapper: OPTIONAL
-> the MSX-2 standard DEFINES memory mappers, but does NOT require
it.
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
MSX Mailinglist. To unsubscribe,
HAVE a memory
mapper? Go get one!
BTW. Adding memory mapper emulation to a MSX-1 emulator should be
easy, and really usefull. There's lots of programs that claim to need
MSX-2, but can run on MSX-1, if it has a memory mapper. Unusual
combination, but works fine! (my R-Type crack r
s SHOULD
be considered unreliable, right?
Bigger:
Turbo-R: 256K (ST) or 512K (GT), mapper
Sony HB-G900AP (note the "A" in there!): 512K or 1 MB., mapper
Greetings,
Alwin Henseler([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
MSX Mai
too, or should be able to.
And MSX-DOS 2 as well...
And 2+/Turbo-R on a hardware-reset
> [... ramdisk software using Megaram blocks instead of using an EPROM ...]
> > > This would require a disk to be specially booted to convert Megaram to
> > > Megaram-Disk. But Megaram-D
use (more Z80
instructions dealing with memory than with I/O)
-Do the INI in the above loop for starters (!): increases pointers,
AND sets flags!
-> Allows to test those flags immediately (=drop another 5-tick
instruction). If a byte did come in, you're done, if not, simply
decreas
t;...
Dos HAS code for handling "Abort", right? You can do the same, but
instead, you could also jump back to that DOS code handling "abort"
(and don't care what happens from there). That was the idea.
> I also don't know how sector buffers works, as well as &quo
ause
the 2793 and other FDC's like TC8566 are *really* different.
Differences between the 1793 and 2793 are probably not that big, but
I wouldn't swap diskROMs between these.
> And do you know what's the differences between WD1772 and WD1793?
Forget it..!!
TMS 2793 = "obso
yone feel like writing a loader for
this, so that you could run most or all 1 MBit Konami's just like
that, if you happen to have a 4 Meg mapper?)
2 MBit ROMs = 32 blocks -> 32 x 32 mapper blocks = ....
(slotexpander filled with 4 mappers of 4 Meg each)
Greetings,
Alwin Henseler
oks on the outside like a 8020 MSX-1 (with darker case), but with
MSX-2 inside (no diskdrive built-in, but some Designer-plus like
program in ROM as an extra). A bit like a NMS 8245 with the
disk-electronics stripped from it.
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://hu
eta-testing offers will be welcome of course!
On error handling:
Why not -
a) Start & end your routines as much as possible the same way as is
done in the original routines (do some disassembling & code copying,
only squeezing your own version of the interesting parts in between),
or
b) If p
D users.
But even though it doesn't offer ANY obvious advantage, a lot of MSX
HD interfaces (and versions) use different partition tables,
incompatible with one another.
There is one REALLY simple solution for this: 'standard' partition
formats are known, for every incompatible
, that is, not the ROM data ofcourse), normal memory mapper:
read & write block numbers)
-What's the power-on / reset state? Everything "don't know"?
Or blockswitch-mode, but currently selected blocks undefined? Or:
block xx in memory range yyy-, block ... in memory
r download on my pages.
If you have some nice programs to convert that way (that I don't have
yet), feel free to send some to me, for me to do the ripping &
glue-ing of the contents.
P.S. Preferably packed somehow (for safe transport), and no more than
a couple of hundred KB&#x
it diagrams and
alike.
So if you have hardware schematics, datasheets of MSX parts etc. (in
electronic form !!), I'll be happy to put those on my pages.
BTW. many of such projects have already been published or released
earlier (7 MHz, MK megamapper, slotexpander, 2+ expansion etc.)
Gre
the maker, and the guys at the M.E.P., in the meanwhile
you'd better wait for a new archive to get uploaded, before you go
out and get it.
Just thought you might want to know... =:-]
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc
use DOS1, use one of the standard MSX disk formats
(360/720 K)
-If you want to use other disk formats, use DOS2 for accessing these
Greetings,
Alwin Henseler
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
e-mail: [EMAIL PROTECTED]
Please standby...
Setup is copying files to prep
made
normal disk operation a LOT faster. With the knowledge I had here,
the diskROM produced here worked 100% solid right away, like any
other separate or built-in disk-interface (I didn't hear any
complaints later on either). Just a matter of having the right
materials to produce it.
Gr
x27;s
forget about how all the details are implemented by disk systems (I
mean, those details that are 'internal'). In other words, let's
figure out, how this INTERFACE works, what is 'external'
('fixed'/'standard') and what is 'internal' (free
ber, instead of
wasting this with a dummy h value
-You can use some special values (FFh, FEh, FDh etc.) for the drive
number to indicate sub-functions, and use this for instance to
'inquire' about supported features, locations of extra info etc. (you
might use this through other
r 'recipes' for simulations?
I gave the above ideas, and I know of implementations of Conway's
Live game for MSX (one called 'bosbrand', by the MCCM, and another
one written by myself once). But are there more versions of this Live
simulation, or other simulations l
have a Philips NMS 8255 (MSX2 and with 512
> > > Kb RAM) and the game works perfectly with it!
Ehhh, this memory mapper SIZE is not what does it, is it?
The VDP ports are 'ofcourse' the same as in any other MSX:
98h: read/write VRAM
99h: read: VDP status, write: VDP commands/
elf, if
you'd want to.
One more thing: does anyone know what software actually uses this
extra sampleRAM, that you might use to test it?
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc page)
http://www.twente.nl/~cce/index.htm
unpacking!
Alwin Henseler
e-mail: [EMAIL PROTECTED]
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put
in the body (not subject) "unsubscribe msx [EMAIL PROTECTED]" (without the
quotes :-) Problems? contact [EMAIL PROTECTED] (www.stack.nl/~wiebe/mailinglist/)
eat, so let's visit: http:// ????
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put
in the body (not subject) "unsubscribe msx [EMAIL PROTECTED]" (
Hi,
"Klaas" (de Wind?) <[EMAIL PROTECTED]> wrote:
> > Thay call that making a backup of your harddisk once in a
> > while...
>
> Yep, I know. But when the backup is on a zipdisk, and that zipdisk has a
> read-error...
A backup that you can't read = no backup
Alwin ([EMAIL PROTEC
needed (under worse
conditions), a proper error-detection mechanism can well be the
difference between something working lousy, and something working
normal, but just a bit (!) slower. That's all. And you should know
that less-than-optimum conditions are more common than optimimum
condit
Hi again!
Laurens Holst <[EMAIL PROTECTED]> wrote:
> As far as I know there still isn't a program for the MSX with which
> you can (like RAR or ARJ) devide large files into smaller pieces (to
> reassemble later) which can, for instance, fit on a disk.
> Compression is not even nessacary, jus
Can we finally finish this poking stuff?
> Manuel Bilderbeek schreef:
>
> (stuff deleted)
>
> Erik de Boer <[EMAIL PROTECTED]> wrote:
>
> this poke let some software belive that there is an expanded bios on boardit just
> fills in a hook.
> for some software this is enough to let them belive
gram for some purpose, you can get the
ULTIMATE tool for this 'simple' task at:
http://huizen.dds.nl/~alwinh/msx MSX Tech Doc page
Greetings,
Alwin Henseler([EMAIL PROTECTED])
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put
in the bo
bove way works both better and faster, and I
couldn't think of ANY reason not to use this.
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc page)
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and
h before C01Eh is called,
making it a bit difficult to use the other half for boot code.
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc page)
MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put
in the body
/ autofire
-7 MHz.
etc.
And some Russians put online a description of how you can build a HD
interface.
Many of these are free to publish elsewhere, or no-one cares
anyway...just let us know when you put something on the web that
wasn't to be found there before, ok?
Alwin Henseler ([E
rj/Lzh-ed disk-image of an infected disk, or files
would be fine).
BTW. does anyone know where this Zapp-virus came from, who wrote it
originally, or if there are any other virusses or alike on MSX?
Alwin Henseler([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc pa
(?) different under
DOS2...
> This is because the diskrom is swapped into page one.
Happens just the same under DOS as well...
Greetings,
Alwin Henseler([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc page)
MSX Mailinglist. To unsubscribe, send an email t
to be 'posted' on this mailing-list,
send an e-mail with this message to the e-mail addresses on your list
(=the mailing-list)
e) If this gets too much work, use a computer to do the dirty work.
That's it!
Greetings,
Alwin Henseler([EMAIL PROTECTED])
http://huizen.dds.nl/~al
d
another type of connector as well), and I'm not sure whether it could
support DS drives either. As before, consider it antique (amazing if
it is still in original state and works 100%, it'll be something like
14-15 years old by now).
Greetings,
Alwin Henseler ([EMAIL PR
too difficult, just a lot of work.
I suggest doing any image processing on the PC as much as possible,
many MSX programs have very limited capabilities or bugs in this
respect, and take much more time for it.
BTW. What has the presence of a MSX harddisk to do with this? As far
as I know, such
Need a translation? Okay...
From: Computer Gebruikers vereniging <[EMAIL PROTECTED]>
TILBURG 1999 is ON
About: Tilburg 1999 !
Sorry for not reacting earlier, but here is the current status about
the Tilburg 1999 fair !
The reason behind the "silence" is not a lack of interest on our
no sound at all?).
> To Manuel Bilderbeek: Is this info already in the FAQ? If not, please add it.
To Manuel Bilderbeek: Is this info correct in your MSX FAQ? If not,
please correct it. If yes: well done!
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (
oidable network traffic, and...
Bothered every subscriber to this list with 50 e-mails they have to
read, and hit a delete key for one by one, after which they have
learnedNOTHING
Thanks, but no thanks, cut it out!
I greet you,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/
ese MSX machines.
Similarly, bit 7 of PSG-register 15 (port B, =output) controls the
Kana LED in Japanese MSX machines (0 = on, 1 = off), but has no
effect on non-Japanese machines.
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc pa
single instructions was enough to re-enable
support for this verify-flag. And working perfectly.
As before: really not uncommon such things.
> Or is loading to page 1 by the #4010 routine legal after all?
Dutch: ja dus! ;-)
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
htt
ctually returned in
practice, although this is used seldom by programs.
(equal to input number if nothing could be done)
BTW. the number of sectors is defined as 1...255, and it may actually
be 255 (!), because for MSX-DOS 1, the sector size need not be 512,
but can be smaller or bigger, like 12
#x27;s headaches, when trying to
write software that does disk-I/O using multiple RAM/mapper slots,
and under DOS2 (like for sampling programs, using MemMan to use 2 or
more memory mappers). No problem doing disk-I/O to the 'primary'
(DOS-) mapper, no problem accessing the other map
blem later on that would require re-doing some of the earlier
work, that earlier work will not have included any actual coding, and
the work to be re-done would simply be an agreement on an alternative
method, defined in 'pseudo-code'.
All this could speed up the creation of this new sy
4010h), with some special input value, to determine
this.
If you would use some special ROM memory location, which location to
use then? If you would use a new entry, how to fit this in existing
ROM's? Using a special sub-function for 4010h entry could have an
undesirable impact on performance
ere, like
the fact that the address of this 0005h-jump also indicates the free
DOS memory. There might be some other system variables using this/
used to set this as well.
One way or the other, this can be done, I did it myself sometime. I
don't know exactly how anymore, but this really is not
h back to IM 1
If that still doesn't do it:
-Use a faster METHOD of obtaining your goal
-Write even faster code
-make a turbo-circuit (6/7 MHz. or my own) a system requirement
-or make it a TurboR program
Greetings,
Alwin Henseler([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx(MS
BASIC 2.x to go with it?
Can anyone try this, just to satisfy our curiosity?
(P.S. The combination MSX-1/mapper DOES work as normal, I know this
for a fact. You can even run some MegaROM cracks on such a system,
that are stating to be MSX-2 only...)
Greetings,
Alwin Henseler ([EMAIL PROTECTED]
Hi all,
Claudio Massao Kawata <[EMAIL PROTECTED]> wrote:
(..)
> Alwin Henseler ([EMAIL PROTECTED]) wrote
> about the way the leap years are calculated (once each four
> years, except once each century, except once each four
> centuries). I already knew that (many yea
register C of the
PPI (also used in the BIOS routines).
Ofcourse, you'd have to do some assembly programming to get a decent
audio frequency tone out of the cassette port.
If you're thinking of using it to control anything, like LED's,
relais, other hardware, I would u
nothing to fear, but whether or not you
choose to violate any existing copyrights, is your own decision, I
didn't tell you that's okay, nor will I try to keep you from doing
so.
For these copyrighted things, this is just the same as with Konami's
or any other copyrighted software (
ling method is:
-100% Compatible: if you call an old driver with it, nothing will
happen, and an error gets returned. Any old calling methods have the
normal effect
-'Interslot-call proof'
-Fast
-Easy for programmers
I challenge you to come up with a better way.
Greetings,
Alwin
le delay.
For data-transfer, I would rather make a 'dedicated' cable, optimised
for either speed, simple construction (largely 1:1 connection) or as
few wires as possible.
BTW: I checked the 'official' JoyNet pages, and although I doubt the
practical use of defining such a
ee to upload it to an FTP-site (Funet for example). Please let
me know where it's at, if you make a copy available somewhere.
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc page)
MSX Mailinglist. To unsubscribe, send an email
f drives,
but the maximum size per drive.
FAT16 support would be nice, but it's really useless without access
to bigger drives, so shall we figure that out first?
I have one question here: can anyone make it clear what exactly those
special values for cluster numbers (FFx for FAT12, and ???
ile format would
be easy. The (de)compression method is the hard part, cmmplicated
& CPU-intensive (good luck).
P.S. Who not do a PNG (Portable Network Graphics, the
'GIF-replacement-to-be') encoder/decoder instead?
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl
to
64K sectors per partition (thus max. 32 MB. per partition with 512
byte sectors), and FAT12 system (I think MS-DOS FDISK makes FAT16
partitions above some 15 MB.)
More info, please!
Alwin Henseler([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc page)
http://www.
Laurens Holst <[EMAIL PROTECTED]> wrote:
> : People,
> :
> : I knew this story of a SONY MSX2 in MIR, but anybody has a
> : photography of this conputer in the space station? Anybody
> : know how this computer gone in MIR? How is the function of
> : this computer inside MIR, etc...
> :
>
riddle to me, but the
disadvantage of this type of memory was, that the magnetic area's
signalling "1" and "0" needed to be far larger than in the
floppy/harddisk system, making 'bubble memory' large and difficult to
handle devices. That's why they're no
Hi again,
> On Thu, 8 Oct 1998, I wrote:
>
> > As for the significance of a year2k-bug on MSX: I doubt anything much
> > will happen as a result of a MSX year2k-bug, simply because MSX's are
> > probably used in very few, or non, 'critical' applications. There's
> > surely not an airport an
"CPU clock" in the one slot, and cartridges
(un-modified) using 3.58 MHz. in the other slot. Just try
possible combinations of cartridges you have, then decide
what signal to put on each cartridgeslot. Cartridges not using either
one can be put in both, and with turbo off, it's all
ould be the central place to find such facts or
solutions.
You might not see the possible importance of this, but if anyone
should provide some central place for MSX-related year2K issues,
shouldn't it be a couple of MSX-freaks like us, running that store?
And why would you take part in i
t these, there's plenty of reading
material on this available from the manufacturers of such IC's, like
Intel, AMD, Texas Instruments, .(some 50 or 100 more to choose
from)
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc page)
h
for the
users, every copy 'branded' with the name of the rightfull owner, and
even if this would be ignored, I'm sure that the mentioning of the
good case it was related to (Multiple Scleroses) will have made
several people buy one, when they wouldn't have otherwise. This
d 34 (mrt./apr. 1991, imrovements &
corrections). Forget about 6 MHz. though, this design was always
'buggy' from the start, I doubt it's ever been perfected
> Alwin Henseler (the hardware man of former MSX CLub Enschede) promised to me
> that he would publ
se add this to MSX hardware-related pages, so
that other people 'just browsing' will come along, and be able to
comment on it.
Let's see what happens!
Alwin Henseler
e-mail: [EMAIL PROTECTED]
MSX lives! (one way or the other, but there's no doubt about it)
MSX Mailingli
Hi folks!
I place this 'add' here for a 3rd person, I don't know if this is the
'right' place to put such an add, but I think it's a SUITABLE place
for it:
For sale is: (it's in the Netherlands, if you're outside the
Netherlands, forget it, replies are probably preferred in Dutch)
Philips
will do,
in the MSX you might need 512 K, 1, 2, 4 MB., or even more
So: forget it.
Only way to accomplish something similar, is to run MSX software on
an emulator, that supports saving/restoring the emulated MSX's
status, but this is another matter
Greetings,
Alwin Henseler ([EMAIL P
in
And last (but not least?): does anyone know of other circuits like
this, apart from Z180 or Z380 projects heard of earlier, so
let's say, "7 MHz. replacements"?
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
website: www.twente.nl/~cce/index.htm
Hit this site for your
=8-((
How not to recharge these: remove in the 8250 either resistor R162
(220 ohm), or diode D130 (any one of these, or both, doesn't matter,
I suggest you take the resistor). Both are next to the battery,
on the + side, and you can put it back in when you decide to change
the batt
D-235F (sounds a lot like it) in a box with trash at
my place, it's got jumpers named "FG" (forget this one), "D0" (A:),
"D1" (B:), "DC" (DiskChange, should be empty), "RY" (ReadY, should be
present), "IR" (?, leave it alone), a
ed', I'm not sure, but I think
some drives use it to put a DiskChange signal on this pin, for
instance.
If all this still doesn't help, I suggest you forget about hooking
this Teac FD-235HF up to a Turbo-R
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://www.twente.nl/~c
Can you read out this 16 KByte ROM, and maybe put it on the web
somewhere?
b) Is it possible for you to make some kind of a circuit diagram of
the hardware in this cartridge (maybe send me a copy, on paper would
be okay) ?
If you need any extra info about this, like IC pinouts, or MSX
cartrdige
de)
Dutch & English versions available, both in text & HTML format.
Greetings,
Alwin Henseler,
'webmaster' for the (small !) computer users group Enschede
e-mail: [EMAIL PROTECTED]
One more thing: don't forget your umbrella :-<
MSX Mailinglist. To
isplay 128 bytes per line (unset: 256 bytes)
> ...
Hey, I guess there must be, because it's all implemented in hardware
somehow...
V9938 databook doesn't tell, so this is 'undefined'. Only way to find
out is to investigate a real V9938, and no guarantees it will work
ppen (if only 1 output is short-circuited, for most IC's this means
no more than handling the excessive heat-production caused by the
short-circuit current of this 1 output, making it 'peanuts' for many
IC's).
All clear now?
Greetings,
Alwin Henseler ([EMAIL PROTECTED
at (who uses
SCREEN 2 or 4 anyway).
What WOULD be interesting to know:
If there is a number of bits controlling the screen modes, and there
are less screen modes, than possible combinations of these bits, WHAT
screen-modes DO you get, when setting one of these undefined
combinations that are pos
er hardware details
available as well). I do remember that the construction of this
light-pen connection was really simple
Oh yeah, I'm talking about a Daewoo CPC-400S here (not such a funny
looking 'gameconsole', but a 'regular' built home computer).
Greetings,
Alw
y bug was about, I did reproduce it
myself once or twice, it more or less simply came down to:
'unreliable memory mapper switching'.
Greetings,
Alwin Henseler ([EMAIL PROTECTED])
http://huizen.dds.nl/~alwinh/msx (MSX Tech Doc page)
http://www.twente.nl/~cce/index.htm(computerclub
keep working, you have to provide enough
stack space, make sure that interrupts occur only at such a rate that
the CPU can process them, and make sure an interrupt-processing
routine is built properly.
Well, it's time to interrupt this thing now;-)
Greetings,
Alwin Henseler ([EMAIL PRO
re is built in the same BIOS-routine(s) handling the
mouse, and paddles, and graphic tablets, and lightpens (if any).
Interesting thought:
Maybe there already exists some software using such a lightpen (via
these BIOS-routines), just nobody knows, because these lightpens are
not around that
mentioned earlier by someone, is
simply not used in any MSX hardware, so ending the interrupt routine
with a normal RET just makes it a tiny bit faster.
The rest of interrupt-related stuff is just a matter of how
peripherals, like the VDP, generate them, and how you can control
these periph
that there are various
low-level hardware-actions that immediately re-enable the pause
function again:
-any VDP access, EVEN if still in "DI" state (damn..)
-Z80 "EI" instruction (regardless of interrupt routines used)
I'm not quite sure about these things either, and mayb
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