Maplins Weather Satellite Receiver - Revision history

Ygdrazil at 11:44, 8 September 2014

2014-09-08T11:44:33Z

← Older revision		Revision as of 11:44, 8 September 2014
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	* Weather Satellite Down Converter – Part 2 - project 23 (not yet scanned, does somebody have it on paper?)		* Weather Satellite Down Converter – Part 2 - project 23 (not yet scanned, does somebody have it on paper?)
	* Weather Satellite Prediction Table - project 24 (not yet scanned, does somebody have it on paper?)		* Weather Satellite Prediction Table - project 24 (not yet scanned, does somebody have it on paper?)

			[[Category:Peripherals]]

Nocash: /* Source Code */

2010-08-23T23:04:53Z

Source Code

← Older revision		Revision as of 23:04, 23 August 2010
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	== Source Code ==		== Source Code ==

			Here is a commented version of the original sample code...

	--- basic code ---		--- basic code ---

Nocash: /* Source Code */

2010-08-23T23:03:57Z

Source Code

← Older revision		Revision as of 23:03, 23 August 2010
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	call 0BD19h ;MC_WAIT_FLYBACK		call 0BD19h ;MC_WAIT_FLYBACK
	call 0BD19h ;MC_WAIT_FLYBACK		call 0BD19h ;MC_WAIT_FLYBACK
	loop1:		loop1: ;--- y loop ---
	di		di
	ld bc,io_port		ld bc,io_port
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	dec d ;		dec d ;
	jr nz,delay ;/		jr nz,delay ;/
	loop2:		loop2: ;--- x loop ---
	di		di
	resmod equ $+1 ;\horizontal resolution		resmod equ $+1 ;\horizontal resolution
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	plot: ;		plot: ;
	ld [hl],a ;/		ld [hl],a ;/
	ld bc,0001h		ld bc,0001h ;\
	ld hl,[xreg]		ld hl,[xreg] ;
	or a ;cy=0		or a ;cy=0 ;
	sbc hl,bc		sbc hl,bc ; next x
	jr c,nexy		jr c,nexy ;
	ld [xreg],hl		ld [xreg],hl ;
	jp loop2		jp loop2 ;/
	nexy:		nexy: ;\
	ld hl,160-1		ld hl,160-1 ;
	ld [xreg],hl		ld [xreg],hl ;
	ld hl,[yreg]		ld hl,[yreg] ;
	or a ;cy=0		or a ;cy=0 ;
	sbc hl,bc		sbc hl,bc ; next y
	jr nc,newlin		jr nc,newlin ;
	ei		ei ;frame done ;
	ret		ret ;return to basic ;
	newlin:		newlin: ;
	ld [yreg],hl		ld [yreg],hl ;
	jp loop1		jp loop1 ;/
	bytead: ;color palette (increasing luminance on green monitor)		bytead: ;color palette (increasing luminance on green monitor)
	db 0,1,2,4, 5,6,8,10, 12,14,16,18, 20,22,24,26		db 0,1,2,4, 5,6,8,10, 12,14,16,18, 20,22,24,26

Nocash: /* I/O Port Address */

2010-08-23T23:00:23Z

I/O Port Address

← Older revision		Revision as of 23:00, 23 August 2010
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	The recommended I/O address (used in the CPC example source code) is Port F8F0h (ie. shorten Link 1 on the [[Maplins 8bit Input Port]]).		The recommended I/O address (used in the CPC example source code) is Port F8F0h (ie. shorten Link 1 on the [[Maplins 8bit Input Port]]).

			Bit7 Dotclock (probably derived from E.O.C.) (end of ADC conversion)
			Bit6 Sync (used as hsync) (the sample program doesn't seem to do any vsync handling?)
			Bit5-4 Unknown/unused
			Bit3-0 Luminance

	The decoder outputs some control signals and an 8bit luminance signal. That data can't be squeezed through the 8bit input port, so some of the luminance bits are left unconnected (the CPC's color palette couldn't display them anyways).		The decoder outputs some control signals and an 8bit luminance signal. That data can't be squeezed through the 8bit input port, so some of the luminance bits are left unconnected (the CPC's color palette couldn't display them anyways).

Nocash: /* Source Code */

2010-08-23T22:54:08Z

Source Code

← Older revision		Revision as of 22:54, 23 August 2010
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	== Source Code ==		== Source Code ==

			--- basic code ---

			5 MEMORY 30000:MODE 2
			10 LOAD"wefax1.obj"
			20 INPUT "enter horizontal resolution 1-4";resh
			30 IF resh>0 AND resh<5 THEN POKE <resmod>,resh ELSE CLS:GOTO 20
			40 CALL <entryoint>
			50 CALL <rerun>
			60 GOTO 50

			--- asm code ---

	io_port equ 0F8F0h		io_port equ 0F8F0h
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	loop2:		loop2:
	di		di
	ld d,2		resmod equ $+1 ;\horizontal resolution
			ld d,2 ;<-- MODIFIED (1..4) ;/
	ld bc,io_port		ld bc,io_port
	smpl: ;\		smpl: ;\

Nocash at 22:50, 23 August 2010

2010-08-23T22:50:14Z

Show changes

Nocash: /* I/O Port Address */

2010-08-23T16:25:36Z

I/O Port Address

← Older revision		Revision as of 16:25, 23 August 2010
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	== I/O Port Address ==		== I/O Port Address ==

	The ~~project is rather unclear about the~~ recommended I/O address~~: The Decoder's~~ CPC example source code ~~uses~~ Port F8F0h. ~~However,~~ the 8bit Input Port ~~project (which is, among others, explicitely intended for use with the Decoder~~) ~~does use Port F8Exh~~.		The recommended I/O address (used in the CPC example source code) is Port F8F0h (ie. shorten Link 1 on the [[Maplins 8bit Input Port]]).

	The decoder outputs some control signals and an 8bit luminance signal. That data can't be squeezed through the 8bit input port, so some of the luminance bits are left unconnected (the CPC's color palette couldn't display them anyways).		The decoder outputs some control signals and an 8bit luminance signal. That data can't be squeezed through the 8bit input port, so some of the luminance bits are left unconnected (the CPC's color palette couldn't display them anyways).

Nocash at 15:55, 23 August 2010

2010-08-23T15:55:37Z

← Older revision		Revision as of 15:55, 23 August 2010
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	* Weather Satellite Receiving System – Part 1 - Receiver - project 18 (not yet scanned, does somebody have it on paper?)		* Weather Satellite Receiving System – Part 1 - Receiver - project 18 (not yet scanned, does somebody have it on paper?)
	* [[Media:Maplins Weather Satellite Part 2 (Decoder) (Project Book 20).pdf\|Weather Satellite Receiving System – Part 2 - Decoder - project 20.a]] (pdf)		* [[Media:Maplins Weather Satellite Part 2 (Decoder) (Project Book 20).pdf\|Weather Satellite Receiving System – Part 2 - Decoder - project 20.a]] (pdf)
	* [[Media:Maplins Amstrad 8bit Input Port (Project Book 20).pdf\|Amstrad 8bit Input Port (for use, among others, with the Satellite Receiver) - project 20.b]] (pdf)		* [[Media:Maplins Amstrad 8bit Input Port (Project Book 20).pdf\|Amstrad 8bit Input Port (for use, among others, with the Satellite Receiver) - project 20.b]] (pdf) (see [[Maplins 8bit Input Port\|here]] for details and commented schematic)

	Judging from their name, the following maplin projects may be also related:		Judging from their name, the following maplin projects may be also related:

Nocash: /* Project Summary */

2010-08-23T13:28:26Z

Project Summary

← Older revision		Revision as of 13:28, 23 August 2010
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	The decoder outputs some control signals and an 8bit luminance signal. That data can't be squeezed through the 8bit input port, so some of the luminance bits are left unconnected (the CPC's color palette couldn't display them anyways).		The decoder outputs some control signals and an 8bit luminance signal. That data can't be squeezed through the 8bit input port, so some of the luminance bits are left unconnected (the CPC's color palette couldn't display them anyways).

	== ~~Project Summary~~ ==		== Scanned Articles ==

	The Weather Satellite receiver consists of three Maplin projects:		The Weather Satellite receiver consists of three Maplin projects:

Nocash at 13:27, 23 August 2010

2010-08-23T13:27:54Z

← Older revision		Revision as of 13:27, 23 August 2010
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			Weather Satellite decoder from [[Maplin]]. Consists of at least three separate projects: The analogue Receiver, the analogue to digital Decoder, and the 8bit Input Port for connecting it to the CPC. The Decoder project contains source code for BBC B and for [[Amstrad]] CPC.

			== I/O Port Address ==

			The project is rather unclear about the recommended I/O address: The Decoder's CPC example source code uses Port F8F0h. However, the 8bit Input Port project (which is, among others, explicitely intended for use with the Decoder) does use Port F8Exh.

			The decoder outputs some control signals and an 8bit luminance signal. That data can't be squeezed through the 8bit input port, so some of the luminance bits are left unconnected (the CPC's color palette couldn't display them anyways).

	== Project Summary ==		== Project Summary ==

	The Weather Satellite receiver consists of three Maplin projects:		The Weather Satellite receiver consists of three Maplin projects:

	*Weather Satellite Receiving System – Part 1 - Receiver - project 18		* Weather Satellite Receiving System – Part 1 - Receiver - project 18 (not yet scanned, does somebody have it on paper?)
	*Weather Satellite Receiving System – Part 2 - Decoder - project 20.a		* [[Media:Maplins Weather Satellite Part 2 (Decoder) (Project Book 20).pdf\|Weather Satellite Receiving System – Part 2 - Decoder - project 20.a]] (pdf)
	*Amstrad 8bit Input Port (for use, among others, with the Satellite Receiver) - project 20.b		* [[Media:Maplins Amstrad 8bit Input Port (Project Book 20).pdf\|Amstrad 8bit Input Port (for use, among others, with the Satellite Receiver) - project 20.b]] (pdf)

	Judging from their name, the following maplin projects may be also related:		Judging from their name, the following maplin projects may be also related:

	*Weather Satellite Down Converter – Part 1 - project 22		* Weather Satellite Down Converter – Part 1 - project 22 (not yet scanned, does somebody have it on paper?)
	*Weather Satellite Down Converter – Part 2 - project 23		* Weather Satellite Down Converter – Part 2 - project 23 (not yet scanned, does somebody have it on paper?)
	*Weather Satellite Prediction Table - project 24		* Weather Satellite Prediction Table - project 24 (not yet scanned, does somebody have it on paper?)