Search found 186 matches

by lezanderson
17 Jun 2019 11:45
Forum: OFF TOPIC
Topic: The British Camputers Lynx Microcomputer
Replies: 6
Views: 9599

Re: The British Camputers Lynx Microcomputer

Costing a design When designing any system from the outset an eye should be kept on projected costs. If this is not done you could end up designing something that is simply unrealistically expensive to make ! Costing a Basic Design: (Design 1) Z80 CPU 6MHZ (Z84C0006PEC) DIP 40 ………………..........….......
by lezanderson
13 Jun 2019 10:54
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 18
Views: 22592

Re: Homebrew DIY SAM Coupe ?

CPLDs GALs PLDs and other programmable logic. Before the days of programmable logic like CPLDs,GALs/PALs and the like, microcomputer systems used TTL or CMOS ICs as ‘Glue’ logic to build a microcomputer system. This greatly increased the chip count and PCB complexity, it also slowed the system down...
by lezanderson
12 Jun 2019 11:37
Forum: OFF TOPIC
Topic: The British Camputers Lynx Microcomputer
Replies: 6
Views: 9599

Re: The British Camputers Lynx Microcomputer

Motorola 6845 CRTC (Cathrode Ray Television Controller) The video chip used in the Camputers Lynx is the Motorola 6845 Video Chip or CTRC. See Wiki page : https://en.wikipedia.org/wiki/Video_display_controller https://en.wikipedia.org/wiki/Motorola_6845 The 6845 is part of the 6800 IC set and desig...
by lezanderson
11 Jun 2019 15:03
Forum: OFF TOPIC
Topic: The British Camputers Lynx Microcomputer
Replies: 6
Views: 9599

Re: The British Camputers Lynx Microcomputer

Is Anyone design/building their own Camputers Lynx ? If you are designing or building your own Camputers Lynx then I may have some old Z80 ICs and stuff you can have for Free ! Just email me at ; lezanderson@gmail.com ICs ; Z80 CPUs Z80 KIOs SRAM/EPROM and other memory chips 82C55 & 82C51 I/O C...
by lezanderson
11 Jun 2019 14:59
Forum: OFF TOPIC
Topic: The British Camputers Lynx Microcomputer
Replies: 6
Views: 9599

Re: The British Camputers Lynx Microcomputer

Musings on Designing a Modern Camputers Lynx ? Designing a Modern(ish) homebrew Camputers Lynx , isn’t so unrealistic or impractical as you may think, as all of the necessary original chips are still available. Design specification: Z80 CPU (Z84C0020xx) 20MHz Max 192K Fast SRAM (instead of old slow...
by lezanderson
11 Jun 2019 14:56
Forum: OFF TOPIC
Topic: The British Camputers Lynx Microcomputer
Replies: 6
Views: 9599

The British Camputers Lynx Microcomputer

The British Camputers Lynx Microcomputer What is a Camputers Lynx : The Camputers Lynx was a 1980s Z80 based British microcomputer . Lynx had similar hardware to the Amstrad CPC series but was completely incompatible, note the Lynx was released before the Amstrad CPC. See Wiki page: https://en.wiki...
by lezanderson
04 Jun 2019 19:46
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 18
Views: 22592

Re: Homebrew DIY SAM Coupe ?

More information on the SAM Coupe can be found :


Sam Coupe Wiki Page :


https://en.wikipedia.org/wiki/SAM_Coup%C3%A9

The SAM Coupe site from QUAZAR

https://www.samcoupe.com/

Links to SAM Coupe sites:

https://sam.speccy.cz/samweb.html
by lezanderson
02 Jun 2019 12:24
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 18
Views: 22592

Re: Homebrew DIY SAM Coupe ?

SAM Copue / ZX Spectrum Floppy Disc Controllers FDC : The ZX Spectrum (Amstrad Versions) used a uPD765 FDC with a SED9420 765 FDC was also used in the Amstrad CPC : µPD765 - Floppy Disc Controller (used in DDI-1 and CPC 664/6128). More than one manufacturer made 765 compatible ICs. These are the on...
by lezanderson
01 Jun 2019 13:38
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 18
Views: 22592

Re: Homebrew DIY SAM Coupe ?

* From Martin's post * For an idea of resource cost, I've VHDL code for a VGA 256 x 192 pixel doubled to 512 x 384 ZX Spectrum style display, that currently compiles to just 65 macro cells in the EPM7128. I'm hoping that once it's fully debugged it will fit into a EPM7064 (or ATF1504) That's using ...
by lezanderson
01 Jun 2019 00:02
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 18
Views: 22592

Re: Homebrew DIY SAM Coupe ?

Sound Circuit ? SAA1099+YM2149+SN76489 Programmable Sound Generators ! The original SAM Coupe used a PhilipsSAA1099 sound chip DIP18, however it didn't use a AY-3-8910/YM2149 sound chip. This meant that some ZX Spectrum software may not run or woul not be as good, as there'd be no sound ! Thus desi...