Search found 174 matches

by lezanderson
15 Jul 2019 11:19
Forum: OFF TOPIC
Topic: More Free Chips to Good Home
Replies: 1
Views: 55

Re: More Free Chips to Good Home

Mini Memotech MTX ? Is anyone thinking of designing their own 'Mini' Memotech ? for anyone that is i've got some FREE chips they can have to get you started. Z84C00xx CPUs DIP/PLCC Z80 CTC DIP/PLCC UM61256-xx 32K Fast SRAMs Skinny DIP UM61512-xx 64K Fast SRAM Skinny DIP IS61C1024-xx 128K Fast SRAM ...
by lezanderson
15 Jul 2019 11:10
Forum: OFF TOPIC
Topic: TMS99105 : Kit of ICs (Chips) for 'Super' Ti-99/4A Homebrew Builders
Replies: 1
Views: 49

Re: TMS99105 : Kit of ICs (Chips) for 'Super' Ti-99/4A Homebrew Builders

Musings and ideas on the design of a Enhanced Ti-99/4A Design Specification : CPU (Central processor Unit): TMS99105 24MHz processor. A improved and much faster version of the original TMS9900 CPU. Memory System Memory Mapper 74xx612 (74HCT612) to allow 1 Meg of RAM/ROM. The system would boot to 12...
by lezanderson
13 Jul 2019 12:24
Forum: OFF TOPIC
Topic: More Free Chips to Good Home
Replies: 1
Views: 55

More Free Chips to Good Home

I've still got some Surplus Chips..! Anyone building their own homebrew microcomputer may be interested. These are mainly PLCC type but some are DIP or Skinny DIP Z80 CPUs PLCC44 (Z84C0020VEC type) Z180s PLCC SRAM,EPROM DIP PLCC TMS9918ANL/TMS9929ANL DIP 8477 PLCC Advanced Floppy disk controllers M...
by lezanderson
13 Jul 2019 12:14
Forum: OFF TOPIC
Topic: Homebrew DIY SAM Coupe ?
Replies: 15
Views: 584

Re: Homebrew DIY SAM Coupe ?

Quazar (For the SAM Coupe) >> https://www.samcoupe.com/ Quazar is currently designig a NEW SAM Coupe ?? Pandemonium - a new SAM! >> *** Extract from the Quazar website * below: **************************************************************************************************************************...
by lezanderson
13 Jul 2019 11:54
Forum: OFF TOPIC
Topic: TMS99105 : Kit of ICs (Chips) for 'Super' Ti-99/4A Homebrew Builders
Replies: 1
Views: 49

TMS99105 : Kit of ICs (Chips) for 'Super' Ti-99/4A Homebrew Builders

** TMS99105 Super Ti-99/4A ** For anyone designing or thinking of designing their own ‘Super’ Ti-99/4A microcomputer, I’ve asked a Chinese supplier to list a compilation of ICs which may help get you started. The Heart or Key to the list of ICs is the TMS99105, which is considerably faster than the ...
by lezanderson
08 Jul 2019 11:19
Forum: OFF TOPIC
Topic: The ' Grundy NewBrain' a forgotten micro from the past.
Replies: 0
Views: 58

The ' Grundy NewBrain' a forgotten micro from the past.

The Grundy NewBrain was a 80s Z80 based British microcomputer, now much forgotten. It was based on minimal hardware, probably to keep costs down very much in the style of the ZX81/ZX Spectrum. Hardware consisted of a Z80 CPU, RAM, ROM, a dedicated COP (coprocessor/ULA??) to do most of the Work , in...
by lezanderson
01 Jul 2019 19:07
Forum: OFF TOPIC
Topic: TMS9995 'Mini-Cortex' Homebrew Micro
Replies: 5
Views: 2970

Re: TMS9995 'Mini-Cortex' Homebrew Micro

Free Powertran Cortex ICs If you're building your own Powertran Cortec I may have some surplus 'FREE' chips to help you out. As usual it's First come first Served..! If your just looking for spares for old machines..then look on: eBay.com or https://www.ebay.com/str/5hk1584?_trksid=p2047675.l2563 o...
by lezanderson
20 Jun 2019 12:04
Forum: OFF TOPIC
Topic: The British Camputers Lynx Microcomputer
Replies: 5
Views: 201

Re: The British Camputers Lynx Microcomputer

Miscellaneous : Motorola 6845 Display Controller (Video Chip) Further Reading on the 6845 (and clones) [HD46505,6845,6545,V6366 etc] Wiki : https://en.wikipedia.org/wiki/Motorola_6845 V6366 : http://www.vgamuseum.info/index.php/news/item/493-yamaha-v6366c-f Hercules Graphics Card : https://en.wikip...
by lezanderson
17 Jun 2019 11:45
Forum: OFF TOPIC
Topic: The British Camputers Lynx Microcomputer
Replies: 5
Views: 201

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: 15
Views: 584

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...