Search found 110 matches

by tcat
Sun Sep 02, 2018 2:59 pm
Forum: Hardware
Topic: SF314 models
Replies: 4
Views: 686

Re: SF314 models

Hi,
Thank you, encouradged by your replies, here is the next one. I learnt that drives are rubber belt driven. Do these belts vary from model to model? Same belt used for internal drives, and external models. Do they differ for ones with short and wide eject buttons?
Many thanks
Tomas
by tcat
Mon Aug 27, 2018 7:15 pm
Forum: Hardware
Topic: SF314 models
Replies: 4
Views: 686

SF314 models

Hi, Can anyone please advice on external SF314 floppy models? By looking at some pictures on the web, I can only recongnise two variants, with [1] `small eject button' , and [2] `large eject button'. My `STfm' machine has an internal drive capable of standard 720K up to 820K format (i.e. 10 sectors ...
by tcat
Fri Aug 24, 2018 3:18 pm
Forum: For sale / Wanted
Topic: Wanted: SF314 + cables + PSU
Replies: 2
Views: 761

Re: Wanted: SF314 + cables + PSU

mpattonm wrote:I think I have got one in the drawer.

Hi, thank you, PM sent.
T.
by tcat
Fri Aug 24, 2018 2:22 pm
Forum: For sale / Wanted
Topic: Wanted: SF314 + cables + PSU
Replies: 2
Views: 761

Wanted: SF314 + cables + PSU

Hi,
Looking for ATARI ST external DS floppy drive.
Many thanks
Tomas
by tcat
Tue Mar 13, 2018 3:16 pm
Forum: Hardware
Topic: MC68000 in STFM - package
Replies: 3
Views: 782

Re: MC68000 in STFM - package

Hi,

My board is this, with less room above CPU,


[a] aprox. mm's above the CPU?
[b] CPU package, DIL64, 2,54mm pin span, other?

P.S. sorry for being persistent

Many thanks
Tomas
by tcat
Tue Mar 13, 2018 1:11 pm
Forum: Hardware
Topic: MC68000 in STFM - package
Replies: 3
Views: 782

MC68000 in STFM - package

Hi,

I would like to know,

[a] what package is the M68K in STFM, is it standard DIL64, with pins 2,54mm apart?
[b] how much room (aprox. in mm) is above MK68K inside STFM, in case it needs be socketed for some upgrades?

Many thanks
Tomas
by tcat
Tue Mar 06, 2018 8:40 pm
Forum: Hardware
Topic: DIY Fpu Unit for STFM - possible?
Replies: 21
Views: 2654

Re: DIY Fpu Unit for STFM - possible?

Hi,

In the CPU-FPU wiring diagram `74HCxx' ICs are used for address decode. Can these be safely replaced with `74LSxx' ones?

Many thanks
Tomas
by tcat
Mon Feb 05, 2018 7:19 pm
Forum: Hardware
Topic: Atari STFM - chip frequencies
Replies: 6
Views: 868

Re: Atari STFM - chip frequencies

Hi, Thank you this helps. I may need to source 16Mhz for the FPU custom board I wish to design (nothing special just 1pc of DIY quality). I have the chip MC68881FN16B, I believe 16 stands for frequency, while FN, B have no idea. I have started FPU related topic here. http://atari-forum.com/viewtopic...
by tcat
Mon Feb 05, 2018 12:10 pm
Forum: Hardware
Topic: Atari STFM - chip frequencies
Replies: 6
Views: 868

Atari STFM - chip frequencies

Hi,

I wish to find out, what rates various chip frequencies are in plain STFM machines.

MC68000 - 8Mhz, correct?
Blitter - ?
Shifter -?
Any other chip?

Many thanks
Tomas
by tcat
Fri Feb 02, 2018 10:12 am
Forum: Applications
Topic: GEM-Write, GEM-Graph, GEM-Paint
Replies: 12
Views: 3579

Re: GEM-Write, GEM-Graph, GEM-Paint

Hi, Interesting read indeed, some dispute over property rights of the user interface used. I have also found these pages devoted to GEM. DRI developed the GEM orginally for CP/M under PC, while for ATARI they made M68K port, but somehow the GEM apps were never ported. Perhaps, they could be ported n...
by tcat
Fri Feb 02, 2018 7:41 am
Forum: Applications
Topic: GEM-Write, GEM-Graph, GEM-Paint
Replies: 12
Views: 3579

GEM-Write, GEM-Graph, GEM-Paint

Hi,

Atari ST owner's manual makes reference to the above apps for GEM. They sound legacy programs such as ATARI ST Logo. I looked for them in the popular archives but was not able to find any trace of them.

Are there anywhere to be found?

Many thanks
Tomas
by tcat
Fri Feb 02, 2018 7:28 am
Forum: Hardware
Topic: ATARI SF314 / SF354 - external floppy
Replies: 3
Views: 982

Re: ATARI SF314 / SF354 - external floppy

Hi tzok,
Many thanks, this helps. Would you also have by any chance, data link cable wiring, with DIN14 plugs at each end?
Many thanks again
Tomas
by tcat
Thu Feb 01, 2018 12:04 pm
Forum: Hardware
Topic: ATARI SF314 / SF354 - external floppy
Replies: 3
Views: 982

ATARI SF314 / SF354 - external floppy

Hi,

I am looking for connection and power supply specification for the above.

I read somewhere that data links are over DIN14 male connectors, correct? What is the power connector, female?
Also what voltage / current supply should provide?

Many thanks
Tomas
by tcat
Thu Feb 01, 2018 8:52 am
Forum: 680x0
Topic: Boot sector and memory crushing
Replies: 26
Views: 7887

Re: Boot sector and memory crushing

Hi, A small correction in size after BRA.S displacement. Works now realiably on real STFM. (L)oad function still requires `BOOT.PRG', `BOOT.SEC' be on the disk you wish to write the boot sector to. Repackaging all into a single ZIP. Archive: BOOT.zip Length Date Time Name --------- ---------- ----- ...
by tcat
Wed Jan 31, 2018 6:52 pm
Forum: Games - General
Topic: New ST project - Pole Position arcade conversion
Replies: 210
Views: 75214

Re: New ST project - Pole Position arcade conversion

Hi,
well, there are quite some tricks which allow to display more. Look at background here

Amazing, I wonder what these tricks are. When I look at NEO drawing prog, there is a spectrum of dots in a colour picker palette. This also appears to me as more than 16, possible?

Tomas
by tcat
Wed Jan 31, 2018 1:35 pm
Forum: Games - General
Topic: New ST project - Pole Position arcade conversion
Replies: 210
Views: 75214

Re: New ST project - Pole Position arcade conversion

Hi, Just discovered this game, that I only know from Speccy, althought it debuted on 8-bit ATARIs. I tried the Sep'2016 version on my real thing STFM, TOS1.04 with addon Blitter. Plays very well. So I can confirm STE code seems working with STFM blitter too, later versions possibly not, as there is ...
by tcat
Tue Jan 30, 2018 7:40 am
Forum: Hardware
Topic: DIY Fpu Unit for STFM - possible?
Replies: 21
Views: 2654

Re: DIY Fpu Unit for STFM - possible?

Note that TOS 1.00 - 1.04 use Line-F for their own purposes. Hi, Yes now I see, my TOS is 1.04, so I would stick with SFP004 lib. The author of DIY FPU kit, comments on ganing some 1400% on CAD like software runing on MEGA ST (= STFM with detached processor, keyboard). While exploring MM2 SFP004 bu...
by tcat
Mon Jan 29, 2018 8:13 pm
Forum: Hardware
Topic: DIY Fpu Unit for STFM - possible?
Replies: 21
Views: 2654

Re: DIY Fpu Unit for STFM - possible?

Hi,

My STFM programming manual says on exception vectors:
$000028 - LineA: to use with Blitter `$Axxx.w'
$00002C - LineF: internally used by AES `$Fxxx.w'

I was hoping to use LineF for FPU commands, is there a way?
Many thanks
Tomas
by tcat
Mon Jan 29, 2018 6:56 pm
Forum: Hardware
Topic: DIY Fpu Unit for STFM - possible?
Replies: 21
Views: 2654

Re: DIY Fpu Unit for STFM - possible?

Hi Luigi, Actually I may have got it. CPU 68000 has only 16-bit data bus, while FPU 68881 has 32-bit data bus. So to read 64-bit number, we need to access the bus twice in succession. move.l (a0),d0 ; read lower 32bits from fp0 register move.l (a0),d1 ; read upper 32bits from fp0 register Correct? W...
by tcat
Mon Jan 29, 2018 6:16 pm
Forum: Hardware
Topic: DIY Fpu Unit for STFM - possible?
Replies: 21
Views: 2654

Re: DIY Fpu Unit for STFM - possible?

Hi Luigi,

Many thanks this helps a lot.
I am still confused by `@' sign in the instructions' field.

movel a0@,d0
movel a0@,d1


Does it mean this?
move.l (a0)+,d0
move.l (a0),d1


Many thanks.
Tomas
by tcat
Mon Jan 29, 2018 5:20 pm
Forum: Hardware
Topic: DIY Fpu Unit for STFM - possible?
Replies: 21
Views: 2654

Re: DIY Fpu Unit for STFM - possible?

Hi, Looking into `sfp004' library (thank you czietz, Loney), and reading MC68881 manual, I realise how little understanding do I have. I took the example of SIN(x). It seems coded for some GNU/C/ASM compiler, can be possibly also ported to an ST assembler. # FUNCTION: SIN(X) # # base = 0xfffa50 # th...
by tcat
Mon Jan 29, 2018 9:57 am
Forum: Hardware
Topic: DIY Fpu Unit for STFM - possible?
Replies: 21
Views: 2654

Re: DIY Fpu Unit for STFM - possible?

Hi,
@troed, thank you, will do.

Anyone having a datasheet on MC68881?
Many thanks
Tomas
by tcat
Sun Jan 28, 2018 6:49 pm
Forum: Hardware
Topic: DIY Fpu Unit for STFM - possible?
Replies: 21
Views: 2654

Re: DIY Fpu Unit for STFM - possible?

Hi, I have converted `CIRCUIT.IMG' file (which appears some GEM VDI RLE encoded raster file), to a plain PNG. It shows how MC6800 connects to FPU through some address decoding logic. Has anyone attempted to design a suitable daughter PCB layout for ST? CIRCUIT.PNG Is MC68000 socketed in STFM machine...
by tcat
Sat Jan 27, 2018 5:02 pm
Forum: Hardware
Topic: DIY Fpu Unit for STFM - possible?
Replies: 21
Views: 2654

Re: DIY Fpu Unit for STFM - possible?

Hi All, Thank you for ample input, processing ... 1 of 100% of understanding here:-) @czietz There's also a guide to "Add a 68881 numeric processor to your ST" on http://atari4ever.free.fr/ The `fpu68881.zip' contains *.IMG files, what application can open them? @joska Before you do that -...
by tcat
Sat Jan 27, 2018 9:22 am
Forum: Hardware
Topic: DIY Fpu Unit for STFM - possible?
Replies: 21
Views: 2654

DIY Fpu Unit for STFM - possible?

Hi, I was wondering how FPU unit works on ATARI. I can only guess that while $A000, A-line instructions used for graphics, some kind of $F000, F-line instructions possibly used for FP maths? I have only a limited info, and that is on h/w register. $FFFA40 - status register $FFFA40 - command register...

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