Search found 187 matches

by bola_dor
Wed Sep 23, 2020 7:41 pm
Forum: Hardware
Topic: Searching for PCF1306P
Replies: 19
Views: 8814

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: 33
Views: 5304

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: 2795

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: 2795

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: 8814

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: 8814

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: 2795

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...
by bola_dor
Mon Sep 21, 2020 3:36 am
Forum: ZX BASIC
Topic: SCROLL and MCODER II
Replies: 5
Views: 2795

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 ...
by bola_dor
Sat Sep 19, 2020 2:45 pm
Forum: Hardware
Topic: TS1500 problems when using a ZX8-CCP
Replies: 8
Views: 2822

Re: TS1500 problems when using a ZX8-CCP

Here you can find TS1500 schematics https://www.sinclairzxworld.com/viewtopic.php?f=7&t=1582#p16357 As Mark suggested you can try replacing C33, C35, C37, C39. Here you can se how is it done with Spectrum that has similar low ram layout. https://spectrumforeveryone.com/technical/fixing-vertical-jail...
by bola_dor
Thu Sep 10, 2020 3:48 pm
Forum: ZX BASIC
Topic: ZX80 Character position
Replies: 3
Views: 3392

Re: ZX80 Character position

nice code.
I understand its utility on a ZX80 that lacks PRINT AT command.
is it faster than PRINT; or PRINT AT on a ZX81 in a one by one character printing? (I dont thinl it would be faster when printing a string)