Romantic Robot Videoface Digitiser (clone)
Re: Romantic Robot Videoface Digitiser (clone)
I wonder if there are any photos of digitised pictures as an example.
From ZX-Spectrum as well as from ZX81.
I guess the result will be important to decide if one would like to build one.
Kind regards Paul
From ZX-Spectrum as well as from ZX81.
I guess the result will be important to decide if one would like to build one.
Kind regards Paul
In theory, there is no difference between theory and practice. But, in practice, there is.
Re: Romantic Robot Videoface Digitiser (clone)
Found these two examples and personally I don't think it's all that good.
https://www.youtube.com/watch?v=k9CNnm2Zklg

https://www.youtube.com/watch?v=k9CNnm2Zklg
???????????????????????????PIINKEY$?????RND????????????????????????????????????????????????????????PI????????
Re: Romantic Robot Videoface Digitiser (clone)
Thanks Moggy,
I think it's not for me.
I think it's not for me.
In theory, there is no difference between theory and practice. But, in practice, there is.
Re: Romantic Robot Videoface Digitiser (clone)
@Paul: in my first post I shared the link to video grabbed from the clone directly. In the software you can capture 6 screens and save them on tape. They are in SCR format.
The resolution is not great because it is limited to the size of paper area. Quality wise this interface does not have a proper dithering filter but works well with its simplicity.
@XavSnap: good work and hope it will work with ZX81 too.
The resolution is not great because it is limited to the size of paper area. Quality wise this interface does not have a proper dithering filter but works well with its simplicity.
@XavSnap: good work and hope it will work with ZX81 too.
Claudius
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Re: Romantic Robot Videoface Digitiser (clone)
ZHE ZX81 Project.(Same project without driver & crash test)
Project not available yet, sorry.
Project not available yet, sorry.
Last edited by XavSnap on Sat Aug 03, 2024 5:10 am, edited 1 time in total.
Xavier ...on the Facebook groupe : "Zx81 France"(fr)
Re: Romantic Robot Videoface Digitiser (clone)
Hi,
If you try to use the McKlaud's card on a ZX81, you had to cut the ground strap between the ground (A6-A7) and the "0v" (A14) on the Spectrum connector.
On the ZX81 the pin (A14 Spectrum)=(B12 ZX81)... is the A14 BUS address ... set to the ground!
This strap will hang the ZX81...

If you try to use the McKlaud's card on a ZX81, you had to cut the ground strap between the ground (A6-A7) and the "0v" (A14) on the Spectrum connector.
On the ZX81 the pin (A14 Spectrum)=(B12 ZX81)... is the A14 BUS address ... set to the ground!
This strap will hang the ZX81...

Xavier ...on the Facebook groupe : "Zx81 France"(fr)
Re: Romantic Robot Videoface Digitiser (clone)
Hi,
The ASM SPECTRUM code: (@63232/$F700)
(ROM jumps & calls are translated to ZX81 offset)
The ASM SPECTRUM code: (@63232/$F700)
(ROM jumps & calls are translated to ZX81 offset)
Code: Select all
;------- TASM ASM mnemonics. -------
; Compile this file using:
; Set TASMOPTS = -b
; tasm -80 ThisCode.tas MyBinary.BIN
;-----------------------------------
; Zx81 Program name: VB81 XuR [] : Empty Basic Segment.
; REM line name: D=63232/64503 : H=F700/FBF7
#define ORG .org ; TASM cross-assembler definitions
#define equ .equ
;-----------------------------------
;------- ROM and RAM Symbols -------
NMI_CONT equ $006F
R_IX_1 equ $0281
OTHER_STR equ $1B7D
DE_DE+1 equ $12FF
PRINT_ON equ $0B37
T_GR_ZERO equ $18EF
ORG $F700 ; [@63232/@hF700]
DI
PUSH AF
PUSH BC
PUSH DE
PUSH HL
CALL LbF944 ; [63812]
LD (LbF849),SP
LD HL, LbF84C
LD C,(HL)
LD A,$F1
OUT ($7B),A ; User port.
LbF714:
LD SP,$F84D
LD HL, LbF84B
LD A,(HL)
SUB $08
LD B,A
LD A,C
OUT ($7F),A ; User port.
LD HL,$4000
LbF724:
LD DE,$0400
LbF727:
IN A,($7B) ; User port.
AND D
JR Z, LbF727 ; [$F727:63271]
LbF72C:
LD A,$0A
OUT ($5F),A ; Fuller Sound card.(DATA)
LbF730:
IN A,($7B) ; User port.
SRL A
JR NC, LbF730 ; [$F730:63280]
DJNZ LbF72C ; [$F72C:63276]
LD B,$08
LD A,C
OUT ($5F),A ; Fuller Sound card.(DATA)
LbF73D:
IN A,($7B) ; User port.
SRL A
JR NC, LbF73D ; [$F73D:63293]
LD A,C
OUT ($5F),A ; Fuller Sound card.(DATA)
LbF746:
IN A,($7B) ; User port.
SRL A
JR NC, LbF746 ; [$F746:63302]
LD A,C
OUT ($5F),A ; Fuller Sound card.(DATA)
IN A,($5F) ; Memotech HRG mode.
XOR $FF
LD D,A
IN A,($5B) ; User port.
XOR $FF
LD E,A
LD (HL),D
INC HL
LD (HL),E
LD DE,$00FF
ADD HL,DE
DJNZ LbF746 ; [$F746:63302]
POP HL
LD A,H
CP $00 ; [0]
LD B,$08
JR NZ, LbF746 ; [$F746:63302]
LD A,C
AND $0F
CP $0F ; [15-"?"]
JR NZ, LbF77C ; [$F77C:63356]
LD A,C
SUB $10
LD C,A
LD HL, LbF84B
LD A,(HL)
ADD A,$02
LD (HL),A
LbF77C:
INC C
LD A,C
AND $0F
CP $01 ; [1]
JR Z, LbF799 ; [$F799:63385]
LD HL, LbF84D
LD B,$19
LbF789:
INC (HL)
INC (HL)
INC HL
INC HL
DJNZ LbF789 ; [$F789:63369]
LD HL, LbF84B
LD B,(HL)
LD SP,$F84D
POP HL
JR LbF724 ; [$F724:63268]
LbF799:
LD B,$19
LD HL, LbF84D
LbF79E:
LD A,(HL)
SUB $1E
LD (HL),A
INC HL
INC HL
DJNZ LbF79E ; [$F79E:63390]
LD HL, LbF84B
LD A,(HL)
SUB $02
LD (HL),A
LD A,$EF
IN A,($FE) ; Keyboard Port.
BIT 3,A
JR NZ, LbF7BE ; [$F7BE:63422]
LD A,(HL)
ADD A,$03
CP $71 ; [113]
JP P, LbF7BE ; [63422]
LD (HL),A
LbF7BE:
LD A,$EF
IN A,($FE) ; Keyboard Port.
BIT 4,A
JR NZ, LbF7CF ; [$F7CF:63439]
LD A,(HL)
SUB $03
CP $0A ; [10]
JP M, LbF7CF ; [63439]
LD (HL),A
LbF7CF:
LD A,$F7
IN A,($FE) ; Keyboard Port.
BIT 4,A
JR NZ, LbF7E4 ; [$F7E4:63460]
LD A,C
AND $F0
ADD A,$10
CP $F0 ; [240]
JR Z, LbF7E4 ; [$F7E4:63460]
LD A,C
ADD A,$10
LD C,A
LbF7E4:
LD A,$EF
IN A,($FE) ; Keyboard Port.
BIT 2,A
JP NZ, LbF7F7 ; [63479]
LD A,C
AND $F0
JP Z, LbF7F7 ; [63479]
LD A,C
SUB $10
LD C,A
LbF7F7:
LD A,$7F
IN A,($FE) ; Keyboard Port.
RRA
JP NC, LbF830 ; [63536]
LD A,$FE
IN A,($FE) ; Keyboard Port.
RRA
RRA
JP NC, LbF830 ; [63536]
LD HL,(LbF847)
EX DE,HL
LD A,D
AND A
JP Z, LbF714 ; [63252]
CP $F7 ; [247]
JP NZ, LbF819 ; [63513]
LD DE,$7F00
LbF819:
LD HL, LbF84C
LD (HL),C
LD HL,$4000
LD BC,$1800
LDIR
EX DE,HL
LD (LbF847),HL
LD HL, LbF84C
LD C,(HL)
JP LbF714 ; [63252]
LbF830:
LD SP,(LbF849)
LD A,$01
LD (LbF849),A
LD HL, LbF84C
LD (HL),C
CALL LbF87F ; [63615]
POP HL
POP DE
POP BC
POP AF
EI
RET ; ==========================
LbF846:
DEC A
LbF847:
NOP
LD A,A
LbF849:
NOP
LD A,(HL)
LbF84B:
INC (HL)
LbF84C:
LD H,C
LbF84D:
NOP
LD B,B
JR NZ, LbF891 ; [$F891:63633]
LD B,B
LD B,B
LD H,B
LD B,B
ADD A,B
LD B,B
AND B
LD B,B
RET NZ
LD B,B
RET PO
LD B,B
NOP
LD C,B
JR NZ, LbF8A9 ; [$F8A9:63657]
LD B,B
LD C,B
LD H,B
LD C,B
ADD A,B
LD C,B
AND B
LD C,B
RET NZ
LD C,B
RET PO
LD C,B
NOP
LD D,B
JR NZ, LbF8C1 ; [$F8C1:63681]
LD B,B
LD D,B
LD H,B
LD D,B
ADD A,B
LD D,B
AND B
LD D,B
RET NZ
LD D,B
RET PO
LD D,B
NOP
NOP
LbF87F:
LD DE, LbF98D
LD HL,$5087
LD B,$08
LbF887:
PUSH BC
CALL LbF8A9 ; [63657]
LD A,L
ADD A,$10
LD L,A
CALL LbF8A9 ; [63657]
LD A,L
ADD A,$10
LD L,A
CALL LbF8A9 ; [63657]
LD A,L
ADD A,$10
LD L,A
CALL LbF8A9 ; [63657]
LD A,L
SUB $70
LD L,A
INC H
POP BC
DJNZ LbF887 ; [$F887:63623]
RET ; ==========================
LbF8A9:
LD B,$10
LbF8AB:
LD A,(HL)
EX DE,HL
LD C,(HL)
LD (HL),A
EX DE,HL
LD (HL),C
INC HL
INC DE
DJNZ LbF8AB ; [$F8AB:63659]
RET ; ==========================
LbF8B6: ; <63670>
LD HL,$0200
LD DE, LbF98D
ADD HL,DE
EX DE,HL
LD HL,$50C0
LbF8C1:
LD B,$08
LbF8C3:
PUSH BC
LD B,$40
CALL LbF8AB ; [63659]
LD A,L
ADD A,$C0
LD L,A
POP BC
DJNZ LbF8C3 ; [$F8C3:63683]
RET ; ==========================
LbF8D1: ; <63697>
PUSH AF
PUSH BC
PUSH DE
PUSH HL
DI
LbF8D6:
LD HL,(LbF847)
LD A,H
CP $F7 ; [247]
JR NZ, LbF8E1 ; [$F8E1:63713]
LD HL,$7F00
LbF8E1:
LD DE,$4000
LD B,$18
LbF8E6:
PUSH BC
LD B,$00
CALL LbF8AB ; [63659]
POP BC
DJNZ LbF8E6 ; [$F8E6:63718]
LD (LbF847),HL
LD A,(LbF849)
RRA
JR NC, LbF931 ; [$F931:63793]
LD E,$FF
LbF8FA:
LD HL, LbF846
LD B,(HL)
LbF8FE:
DJNZ LbF8FE ; [$F8FE:63742]
DEC E
LD A,E
AND A
JR NZ, LbF8FA ; [$F8FA:63738]
LD A,$FD
IN A,($FE) ; Keyboard Port.
BIT 1,A
JR NZ, LbF915 ; [$F915:63765]
LD HL, LbF846
LD A,(HL)
INC A
INC A
INC A
LD (HL),A
LbF915:
LD A,$FD
IN A,($FE) ; Keyboard Port.
BIT 3,A
JR NZ, LbF929 ; [$F929:63785]
LD HL, LbF846
LD A,(HL)
CP $01 ; [1]
JR Z, LbF929 ; [$F929:63785]
DEC A
DEC A
DEC A
LD (HL),A
LbF929:
LD A,$7F
IN A,($FE) ; Keyboard Port.
RRA
JP C, LbF8D6 ; [63702]
LbF931:
EI
POP HL
POP DE
POP BC
POP AF
RET ; ==========================
LbF937: ; <63799>
LD DE,(LbF847)
LD HL,$4000
LD BC,$1800
LDIR
RET ; ==========================
LbF944:
CALL NMI_CONT+13 ; []*BIOS ROM*
DEC SP
DEC SP
POP HL
LD BC,$000F
ADD HL,BC
EX DE,HL
LD HL,($5C3D)
LD (HL),E
INC HL
LD (HL),D
RET ; ==========================
LbF956: ; <63830>
DEC SP
DEC SP
LbF958:
CALL R_IX_1+13 ; []*BIOS ROM*
LD A,E
CP $FF ; [255]
JR NZ, LbF958 ; [$F958:63832]
LD A,($5C3A)
CP $FF ; [255]
JR Z, LbF988 ; [$F988:63880]
CP $07 ; [7]
JR Z, LbF988 ; [$F988:63880]
CP $08 ; [8]
LbF96D:
JR Z, LbF988 ; [$F988:63880]
INC A
LD ($5C81),A
LD (IY+0),$FF
LD HL,$000A
LD ($5C42),HL
XOR A
LD ($5C44),A
SET 7,(IY+1)
JP OTHER_STR ; []*BIOS ROM*
LbF988:
INC SP
INC SP
JP DE_DE+1+4 ; []*BIOS ROM*
LbF98D:
.db $FF,$FF,$FF,$FF,$7F,$FF,$FF,$FF; DATA
.db $FF,$FF,$FF,$FF,$7F,$FF,$FF,$FF; DATA
.db $EA,$95,$55,$2D,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$5A,$A5,$55,$4B; DATA
.db $FF,$FF,$FF,$FF,$7F,$FF,$FF,$FF; DATA
.db $FF,$FF,$FF,$FF,$7F,$FF,$FF,$FF; DATA
.db $DD,$EA,$23,$B6,$B6,$FF,$E3,$76; DATA
.db $11,$1D,$CD,$FF,$E1,$18,$5B,$6F; DATA
.db $FF,$FF,$FF,$FE,$80,$00,$00,$00; DATA
.db $00,$00,$00,$00,$BF,$FF,$FF,$FF; DATA
.db $EA,$D5,$57,$2D,$19,$9B,$71,$F3; DATA
.db $9F,$38,$F7,$CC,$5A,$B5,$55,$CB; DATA
.db $FF,$FF; DATA
LbF9EF:
.db $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF; DATA
.db $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF; DATA
.db $FF,$FF,$FF,$FF,$FF,$FF; DATA
LbFA05:
.db $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF; DATA
.db $FE,$00,$00,$FD,$06,$00,$30,$00; DATA
.db $00,$0C,$0C,$00,$5F,$80,$00,$3F; DATA
.db $E9,$25,$55,$2D,$39,$9B,$6D,$86; DATA
.db $D8,$6D,$96,$0E,$5A,$49,$55,$4B; DATA
.db $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF; DATA
.db $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF; DATA
EX (SP),HL
POP AF
SBC A,E
LD B,E
POP AF
RET M
CALL Z, LbF96D ; [63853]
CALL M,$2344 ; [9028]
DI
LD SP,HL
CP D
CP E
.db $FD,$FF ; DATAS
RST 38H
LD A,L
LD B,$3C
LD A,B
RET P
INC BC
CALL $7C00 ; [31744]
LD E,A
LD A,A
RST 38H
RST 18H
CALL P,$65C2 ; [26050]
LD E,L
LD A,C
SBC A,E
LD L,L
AND $DE
LD L,L
ADD A,A
ADC A,A
LD E,L
JR NC, LbFA05 ; [$FA05:64005]
LD D,A
RST 00H
LD H,A
POP AF
ADD HL,DE
ADC A,H
LD A,A
POP AF
LbFA74:
.db $FD,$1F ; DATAS
LbFA76:
ADC A,B
CALL Z,$E17F ; [57727]
RET M
LD E,E
LD B,A
RST 18H
RST 28H
.db $6B ; RST28 Arg: Unknown CMD.
.db $5F ; RST28 Arg: Unknown CMD.
RST 28H
.db $F7 ; RST28 Arg: Unknown CMD.
.db $B5 ; RST28 Arg: Unknown CMD.
XOR L
OR $FB
.db $ED,$ED ; DATAS
.db $ED,$F6 ; DATAS
SBC A,D
SUB E
JP M, START ; [Start]
CP L
LD A,$06
JR NC, LbFAAD ; [$FAAD:64173]
LD B,$0E
INC E
LD H,(HL)
LD E,(HL)
ADD A,B
NOP
CPL
JP M, START ; [Start]
CP L
LD A,B
SUB E
LD L,L
ADD A,(HL)
RET C
LD A,L
ADD A,(HL)
RRCA
LD E,(HL)
ADD A,B
NOP
CPL
LbFAAD:
IN A,($5B) ; User port.
RST 28H
.db $B6 ; RST28 Arg: Unknown CMD.
.db $B6 ; RST28 Arg: Unknown CMD.
RST 38H
RST 28H
.db $FD ; RST28 Arg: Unknown CMD.
.db $DF ; RST28 Arg: Unknown CMD.
LD A,L
OR L
CP A
RST 28H
.db $FB ; RST28 Arg: Unknown CMD.
.db $DB ; RST28 Arg: Unknown CMD.
LD L,A
RST 20H
LbFABE:
DI
LD L,E
LD B,A
RST 28H
.db $F7 ; RST28 Arg: Unknown CMD.
.db $B5 ; RST28 Arg: Unknown CMD.
OR E
CALL P,$ECFC ; [60668]
LD L,L
.db $ED,$F6 ; DATAS
XOR D
XOR E
CALL P,$62C2 ; [25282]
LD E,L
LD H,(HL)
LD A,$30
LD SP,HL
EX (SP),HL
ADC A,$0C
LD H,(HL)
LD E,L
JR NC, LbFA74 ; [$FA74:64116]
SUB A
.db $FD,$FF ; DATAS
RST 38H
LD A,L
JR C, LbFA76 ; [$FA76:64118]
LD L,L
ADD A,(HL)
RET C
LD L,L
SUB (HL)
LD C,$5F
LD A,A
RST 38H
RST 18H
JP C,$F3DB ; [62427]
OR (HL)
OR (HL)
RST 38H
DI
DEC DE
CP A
SBC A,L
OR L
CP A
EX (SP),HL
RET M
RST 20H
LD L,A
JP M, PRINT_ON+6 ; []*BIOS ROM*
LD E,A
RST 28H
.db $17 ; RST28 Arg: Unknown CMD.
.db $B4 ; RST28 Arg: Unknown CMD.
LD A,E
JP P,$6D8F ; [28047]
EX (SP),HL
POP HL
DJNZ LbFABE ; [$FABE:64190]
CP E
JP (HL)
DEC H
LD D,L
DEC L
LD H,(HL)
LD H,(HL)
LD SP,$E099
LD L,A
INC C
LD A,H
LD E,D
LD C,C
LD D,L
LD C,E
CP $00 ; [0]
NOP
.db $FD,$18 ; DATAS
LD H,E
LD (HL),C
DI
SBC A,B
LD L,H
RST 30H
CALL Z,$805F ; [32863]
NOP
CCF
ADD A,$DA
DEC A
OR B
ADC A,(HL)
RST 38H
.db $FD,$5B ; DATAS
LD (HL),C
.db $ED,$B4 ; DATAS
LD A,A
RST 28H
.db $1B ; RST28 Arg: Len CMD.
.db $E7 ; RST28 Arg: Unknown CMD.
LD L,A
EI
LD IYL,E
LD E,A
RST 28H
.db $F7 ; RST28 Arg: Unknown CMD.
.db $B5 ; RST28 Arg: Unknown CMD.
RST 30H
OR $FF
LD L,L
RST 28H
.db $ED ; RST28 Arg: Unknown CMD.
.db $F6 ; RST28 Arg: Unknown CMD.
CP D
CP E
JP PE,$55D5 ; [21973]
DEC L
LD A,$3E
INC E
RET M
RLCA
CALL $609E ; [24734]
LD E,D
OR L
LD D,L
LD C,E
RST 38H
RST 38H
RST 38H
CP $00 ; [0]
NOP
NOP
NOP
NOP
NOP
NOP
NOP
CP A
RST 38H
RST 38H
RST 38H
.db $DD,$D7 ; DATAS
OR (HL)
RST 38H
.db $FD,$16 ; DATAS
RST 38H
.db $ED,$B5 ; DATAS
RST 38H
RST 28H
.db $FB ; RST28 Arg: Unknown CMD.
.db $DB ; RST28 Arg: Unknown CMD.
LD L,A
ADD A,$23
LD L,H
JP T_GR_ZERO+2 ; []*BIOS ROM*
CALL LbF9EF ; [63983]
ADC A,B
CALL PE,$ED2F ; [60719]
LD D,$BA
CP E
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00,$00,$00,$00,$00,$00; DATA
.db $00,$00,$00; DATA
Xavier ...on the Facebook groupe : "Zx81 France"(fr)
Re: Romantic Robot Videoface Digitiser (clone)
Video signal shield encapsulate in a tin can box...
Xavier ...on the Facebook groupe : "Zx81 France"(fr)
Re: Romantic Robot Videoface Digitiser (clone)
Did anyone build one of these boards?
I first happened upon this github: https://github.com/McKlaud76/VideoFace and ordered some boards, which came looking well designed etc.
I have now built 2 of them and the both do the same thing, which isn't exactly work correctly, as far as I can see.
The LEDs come on when they should, the software that came with the original is what I used, it slowly loads blocks of graphics to screen, this speed varies between one 16x16 block per second to 10 or 20 16x16 blocks per second, it never reaches the speed of 4 screens per second, like the youtube videos of the device seem to.
The graphics that are drawn to screen correlate in some way with what the camera might be inputting, shining a torch in the lens results in white and a dark video results in black/grey (mix of black and white), and turning the contrast potientiometer can tune the values to too dark or too light, and also for some reason affects the speed at which the graphic blocks are being drawn to screen.
Does anyone have any idea what might be causeing the data to get in the board and to the Spectrum slow?
I first happened upon this github: https://github.com/McKlaud76/VideoFace and ordered some boards, which came looking well designed etc.
I have now built 2 of them and the both do the same thing, which isn't exactly work correctly, as far as I can see.
The LEDs come on when they should, the software that came with the original is what I used, it slowly loads blocks of graphics to screen, this speed varies between one 16x16 block per second to 10 or 20 16x16 blocks per second, it never reaches the speed of 4 screens per second, like the youtube videos of the device seem to.
The graphics that are drawn to screen correlate in some way with what the camera might be inputting, shining a torch in the lens results in white and a dark video results in black/grey (mix of black and white), and turning the contrast potientiometer can tune the values to too dark or too light, and also for some reason affects the speed at which the graphic blocks are being drawn to screen.
Does anyone have any idea what might be causeing the data to get in the board and to the Spectrum slow?
Re: Romantic Robot Videoface Digitiser (clone)
Hi matalog,
Take care to use the right chipset, especially the 74HC4074 (from Thomson!), other brand name are less adapted to the circuit on high speed signal.
I asked the clearance to distribute my PCB to McClaud, but no answers at now. (PM never read, PM full... from Sent: Sun Aug 04, 2024 8:12 pm)
Take care to use the right chipset, especially the 74HC4074 (from Thomson!), other brand name are less adapted to the circuit on high speed signal.
I asked the clearance to distribute my PCB to McClaud, but no answers at now. (PM never read, PM full... from Sent: Sun Aug 04, 2024 8:12 pm)
Xavier ...on the Facebook groupe : "Zx81 France"(fr)