Search found 140 matches

by lezanderson
24 Aug 2018, 10:45
Forum: OFF TOPIC
Topic: Video Processor for homebrew project ?
Replies: 0
Views: 79

Video Processor for homebrew project ?

1 Mbit Versatile SPI / 8-Bit Parallel Bus SRAM with Video Display Controller I spotted an interesting chip that may be useful for those building those little projects both MTX and Non-MTX related. The Chip has 128Kbit SRAM and A PAL/NTSC Video chip on it. http://www.vlsi.fi/en/products/vs23s010.html
by lezanderson
23 Aug 2018, 16:28
Forum: OFF TOPIC
Topic: RC2014 with TMS9918 Video Board: MSX
Replies: 0
Views: 42

RC2014 with TMS9918 Video Board: MSX

Ref : RC2014 Z80 board with MSX video Card

Spotted an interesting video on YouTube :

https://www.youtube.com/watch?v=1K_cc8wFURc

I wonder if an RC2014 with TMS9918 video Card could be modified to run MTXC500 software ??
by lezanderson
12 May 2018, 10:56
Forum: What you are doing with Lez's "Free Stuff"?
Topic: Another build
Replies: 27
Views: 1807

Re: Another build

Martin, I've got other 6502 type chips you may find useful ? W65C816 Enhanced 65C02 R6522 IC MPU DIP MB8877 IC DIP Floppy disc controller FDC DIP 6845/68B45 DIP video Chip 6821/68B21 DIP Peripheral Interface Adapter (PIA) 68B50 DIP ASYNCHRONOUS COMMUNICATIONS INTERFACE ADAPTER (ACIA) - MC6850 68B54 ...
by lezanderson
20 Jan 2018, 13:11
Forum: What you are doing with Lez's "Free Stuff"?
Topic: Another build
Replies: 27
Views: 1807

Re: Another build

Free Acorn Atom ICs For anyone wanting to design or build their own homebrew Acorn Atom I’ve got some surplus ICs for the job. Anyone interested should email me (email me at lezanderson@gmail.com) . I can only handout stuff to those that are serious about building a DIY Acorn Atom. First come first...
by lezanderson
07 Dec 2017, 13:40
Forum: What you are doing with Lez's "Free Stuff"?
Topic: Another build
Replies: 27
Views: 1807

Re: Another build

Information Only ; Acorn Atom kit https://www.ebay.com/itm/Acorn-Atom-Homebrew-IC-Kit-/152817148043 Cost :$14 about £11 which is reasoable. Obviously you'll need to buy all the smaller ICs and bits and bobs elsewhere...but it's a start. And : Dragon 32 /Tandy Color Computer https://www.ebay.com/itm...
by lezanderson
02 Dec 2017, 12:16
Forum: What you are doing with Lez's "Free Stuff"?
Topic: Another build
Replies: 27
Views: 1807

Re: Another build

For anyone interested in building their own 'Super' Atom As designed by Martin A.. >>.I've done some rough costing Prices sourced from eBay.com W65C02P-10 (10Mhz)..................... $2.50 each 82C55 PIO.................................. $1.05 each 6847 VDP....................................$3.50...
by lezanderson
02 Dec 2017, 11:55
Forum: What you are doing with Lez's "Free Stuff"?
Topic: Another build
Replies: 27
Views: 1807

Re: Another build

74AHC is pretty quick 9ns for the 08 and 11.5 for the 138. The real holdup is the time it takes the VDG to release the address bus to the video memory. Maybe if I were doing a re-design I'd use dual port memory there. Vram access time would them be the same as the rom. And allow room to run a coupl...
by lezanderson
30 Nov 2017, 12:21
Forum: What you are doing with Lez's "Free Stuff"?
Topic: Another build
Replies: 27
Views: 1807

Re: Another build

I've got some EPM7032SLC44-10 & EPM7064SLC44-10 (fixed 10ns propagation time, 32 I/O lines) CPLDs... these might replace your rather slow 74xx stuff.. :idea:
by lezanderson
27 Nov 2017, 16:12
Forum: What you are doing with Lez's "Free Stuff"?
Topic: Another build
Replies: 27
Views: 1807

Re: Another build

I'll have a rummage around and see what I can find : W65C02S-14 CPU.....................................W65C02Pxx 6MhZ or better OK ?? 39SF010A-70 128k Flash ROM ....................W27C010-7, 27C1001-7 OK ?? AS6C62256-55 32k Static RAM ....................Don't think I have any 55ns SRAMs only 15ns...
by lezanderson
25 Nov 2017, 12:11
Forum: What you are doing with Lez's "Free Stuff"?
Topic: Another build
Replies: 27
Views: 1807

Re: Another build

Hi.

If you post a Bill Of Materials (BOM) list I'll see if I have any of the ICs laid around and I can send some to Dave.. Thus saving you from buying stuff unnecessarily .

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