Search found 180 matches

by bola_dor
Mon Sep 28, 2020 10:08 pm
Forum: Software
Topic: NTSC2PAL
Replies: 2
Views: 164

Re: NTSC2PAL

I know very little about MC but I guess you are enlarging the amount of the lines in the margin letting more time for the CPU per cycle but not diminishing the active lines in the screen correspondingly in order to keep the Vertical Sync timing. I don't know if that's would be an easy task but it wo...
by bola_dor
Mon Sep 28, 2020 3:59 pm
Forum: Software
Topic: NTSC2PAL
Replies: 2
Views: 164

Re: NTSC2PAL

Impressive!!!
by bola_dor
Thu Sep 24, 2020 1:37 am
Forum: Hardware
Topic: Searching for PCF1306P
Replies: 19
Views: 3990

Re: Searching for PCF1306P

Thanks for your reply bola_dor Don’t worry, I’ll work it out eventually... but not today :mrgreen: Mark 20200923_202643.jpg Ok Tr is conected to +5v . I marked in red points in continuity with 5v rail. Cian are GND And yellow and violet the other leads from Tr Tr is marked as 238B 20200923_203614.j...
by bola_dor
Wed Sep 23, 2020 7:41 pm
Forum: Hardware
Topic: Searching for PCF1306P
Replies: 19
Views: 3990

Re: Searching for PCF1306P

Is the lower RAM made up of eight x MCM4517 DRAM chips? Thanks for posting the NE555 based charge-pump circuit for generating the +12V supply. I have a question, I can’t make sense of the circuit around Q1. The circuitry for the base makes sense, it’s monitoring the voltage on the +12V supply. So I...
by bola_dor
Wed Sep 23, 2020 7:20 pm
Forum: Hardware
Topic: TFW8bit composite mod board
Replies: 31
Views: 662

Re: TFW8bit composite mod board

Make sure that nothing else is still connected to the video out center pin..
I had this TS1500 that drove me krazy because this coneccion from behind
20200728_011215.jpg
by bola_dor
Wed Sep 23, 2020 6:42 am
Forum: ZX BASIC
Topic: SCROLL and MCODER II
Replies: 5
Views: 250

Re: SCROLL and MCODER II

Thanks Xav!
I'll try this later..
I remember 16418 from 35 years ago...
This may be usefull speedwise if I want to use those two bottom lines..
by bola_dor
Wed Sep 23, 2020 2:11 am
Forum: ZX BASIC
Topic: SCROLL and MCODER II
Replies: 5
Views: 250

Re: SCROLL and MCODER II

1 REM [HEX:\ 2A,0C,40,EB,2A,0C,40,01,\ 21,00,09,01,F7,02,ED,B0,\ 01,1F,00,ED,42,EB,23,36,\ 00,0B,ED,B0,C9 ] 2 CLS 4 POKE 16418,0 5 FOR A=0 TO 24 6 PRINT AT 23,A;"*HELLO*" 7 RAND USR 16514 8 NEXT A 9 GOTO 5 10 SAVE"SCROLL" 20 RUN ;------- TASM ASM mnemonics. ------- ; Compile this file using: ; Set ...
by bola_dor
Wed Sep 23, 2020 2:06 am
Forum: Hardware
Topic: Searching for PCF1306P
Replies: 19
Views: 3990

Re: Searching for PCF1306P

20200920_232124.jpg Just to show how it looks.. This is a CZ Spectrum (argentinian clone) the board is a slightly modified ISSUE 6A, low ram is +5v only.. many of them had the PCF1306P but many others had this ZX8401 board. Perhaps because of lacking of stock... the first argentinian Spectrum CZ200...
by bola_dor
Mon Sep 21, 2020 4:28 am
Forum: Hardware
Topic: Searching for PCF1306P
Replies: 19
Views: 3990

Re: Searching for PCF1306P

20200920_232124.jpg Just to show how it looks.. This is a CZ Spectrum (argentinian clone) the board is a slightly modified ISSUE 6A, low ram is +5v only.. many of them had the PCF1306P but many others had this ZX8401 board. Perhaps because of lacking of stock... the first argentinian Spectrum CZ200...
by bola_dor
Mon Sep 21, 2020 4:01 am
Forum: ZX BASIC
Topic: SCROLL and MCODER II
Replies: 5
Views: 250

Re: SCROLL and MCODER II

I am working on a game with a vertical classic SCROLL. and adapting it to be compiled with MCODER II. even when MCII documentation states that SCROLL is treted as in BASIC every time a SCROLL is found it stops with an inverted [?] and waits for a key ading a wite line.. ressult is disastrous to the...