Search found 186 matches

by lezanderson
31 May 2019 22:32
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 18
Views: 22616

Re: Homebrew DIY SAM Coupe ?

+5V CPLDs I believe the Atlera MAX7000 series uses +3.3V for it's Supply rail but I/O is 5V compatible (best to check datasheet!) ? The MAX7000s are in system programmable and seem to be preferred. Most +5V CPLDs seem to be obsolete these days, according to Digikey etc, but that does not make them ...
by lezanderson
31 May 2019 10:56
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 18
Views: 22616

Re: Homebrew DIY SAM Coupe ?

Using CPLDs to Emulate ULAs like in the SAM Coupé ? The original SAM Coupé uses a PLCC ULA to give quite a bit of it’s glue logic and Video Mode generation & Timing. As these are no longer available some other IC would need to be used to do these functions. Video Logic Video Logic using a CPLD....
by lezanderson
31 May 2019 10:54
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 18
Views: 22616

Re: Homebrew DIY SAM Coupe ?

ZX spectrum keyboard I'm sure there's people that have made PCBs for ZX Spectrum keyboards. I don't think anyone has made a replacement SAM Coupe keyboard ? https://www.ebay.co.uk/itm/CUSTOM-KEYBOARD-FOR-THE-SINCLAIR-ZX-SPECTRUM-PCB-ONLY/163686830528?hash=item261c7ed1c0:g:xyYAAOSwLNVc2GRv https://w...
by lezanderson
29 May 2019 10:54
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 18
Views: 22616

Re: Homebrew DIY SAM Coupe ?

Homebrew Sam Coupé Design ! Design Specification : CPU Z80> Over-clocked to Max 24Mhz, 512K+ RAM, 64K+ROM, multiple I/O, FDC, video , Sound etc compatible with original SAM Coupé Z80 (Z84C0020xx) CPU DIP/PLCC Running at 6MHz,8Mhz,10Mhz,12MHz,16MHz,20MHz,24Mhz Memory 512K ~Min SRAM, Either low Speed...
by lezanderson
28 May 2019 15:11
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 18
Views: 22616

Homebrew DIY SAM Coupe ?

Sam Coupé Free ICs to anyone serious about building their own Sam Coupé. If anyone is building a DIY/Homebrew Sam Coupé then this may be of interest. The British Sam Coupé was a enhanced Clone of the well know ZX Spectrum. DIP ICs Z84C0020PEC Z80 CPU DIP40 512K SRAM DIP32 64K EPROM DIP28 EPM7512AET...
by lezanderson
15 Feb 2019 13:27
Forum: INTRODUCE YOURSELF
Topic: Hello + sad news + opportunity
Replies: 5
Views: 8031

Re: Hello + sad news + opportunity

Hi.

If the MTX512 is still for sale, I can offer £100+Postage. though you'll probably get quite a bit more, possibly double or more, on eBay !

Best Regards
Lez
by lezanderson
21 Dec 2018 14:11
Forum: OFF TOPIC
Topic: Are you b building or thinking of building an Acorn 6502 BBC B/Master
Replies: 5
Views: 8869

Re: Are you b building or thinking of building an Acorn 6502 BBC B/Master

MTX 6502 / BBC Co-Proceesor ICs. I might be able to help with ICs for the MTX co-processor...just tell me which ICs you need R65C02P4 IDT700x (usually IDT7005 8kx8bit) Dual port ram 16V8 Decode GAL (various GALs) 32K,64K,128k static rams 27c256,27c512, 27C010 etc EPROMs, I also have some eeproms/fl...
by lezanderson
20 Dec 2018 14:01
Forum: OFF TOPIC
Topic: Are you b building or thinking of building an Acorn 6502 BBC B/Master
Replies: 5
Views: 8869

Re: Are you b building or thinking of building an Acorn 6502 BBC B/Master

So if your seriously thinking of or currently building a 6502 BBC B/Master system then I might be able to help with ICs 65C02 (R65C02P4 or W65C02Pxx) DIP40 SRAMs , 32K,128k,512K : HM628128-7 or similar 128K SRAM DIP32 16K 32K or 64K ROM DIP32 27C512 etc R65C22 VIA 68B21 PIA MC68B50 ACIA MC68B54 ADL...
by lezanderson
20 Dec 2018 13:55
Forum: OFF TOPIC
Topic: Are you b building or thinking of building an Acorn 6502 BBC B/Master
Replies: 5
Views: 8869

Are you b building or thinking of building an Acorn 6502 BBC B/Master

. . Ideas and Musings about Design & Building a homebrew 6502 Acorn BBC Computer These are just ideas and thoughts and should perhaps be taken with a little pinch of salt. But they are a starting point for anyone possibly thinking of such an endeavour Design ideas: CPU: As in the original a 6502...