I've been hunting around in my old component stock and found a tube of unused 4864 DRAM 16 pin DIP devices.
However, these are 4864P-3 which I understand are about 25% slower than 4864P-2.
My assumption is that Sinclair used the faster devices for good reason and the -3 devices won't cut it in a QL. Would I be right?
150ns access time / 270 ns cycle time, vs 200 ns and 335 ns. Using the -3 is effectively overclocking them? I'm sure QL bus isn't that quick.
4864 DRAM
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Barbarpapa1
- ROM Dongle
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Re: 4864 DRAM
Hello
I’m not computer hardware expert of any kind, but on Slovene computer forum I presented my QL restoration. One of forum members has deep knowledge of QL hardware and he mentioned that QL is full of unexpected and innovative solutions. He specially emphasized how important is RAM timing for QL-s picture generation. QL is apparently only home computer of its generation that uses burst page access to RAM for picture generation. The RAM timing is responsible for slightly inappropriate video timing in 512 X 256 mode (the picture is normally cut away on the right side). And with use of mentioned burst page access QL manages to squeeze slightly more data for video generation as Atari ST, despite Atari’s double data bus width, compared to the QL.
So the narrative is, RAM timing is very important for the QL…
Have a nice evening…
Jože
I’m not computer hardware expert of any kind, but on Slovene computer forum I presented my QL restoration. One of forum members has deep knowledge of QL hardware and he mentioned that QL is full of unexpected and innovative solutions. He specially emphasized how important is RAM timing for QL-s picture generation. QL is apparently only home computer of its generation that uses burst page access to RAM for picture generation. The RAM timing is responsible for slightly inappropriate video timing in 512 X 256 mode (the picture is normally cut away on the right side). And with use of mentioned burst page access QL manages to squeeze slightly more data for video generation as Atari ST, despite Atari’s double data bus width, compared to the QL.
So the narrative is, RAM timing is very important for the QL…
Have a nice evening…
Jože
-
AndrewLambert
- ROM Dongle
- Posts: 14
- Joined: Wed Jan 17, 2024 2:01 pm
Re: 4864 DRAM
The RAM in the QL was the absolute least they could get away with. Everything is marginal. With the incredibly poor power and debounce practices used, the QL seems to spend almost all its life only just working.
Some early FB QLs had -200 DRAM, but they quickly switched to -150 and some of the very late QLs had -120 on occasion. That was exclusively Samsung production from what I have seen so far.
Some early FB QLs had -200 DRAM, but they quickly switched to -150 and some of the very late QLs had -120 on occasion. That was exclusively Samsung production from what I have seen so far.
Re: 4864 DRAM
Taylor Swift Dog The Bounty Hunter Shirt – The Perfect Gift Idea
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4.3 Available in Multiple Styles and Sizes
This t-shirt is available in various fits, including unisex, women’s, and oversized options. There are also other product variations, such as hoodies and tank tops, allowing buyers to choose the perfect style.
These options make it easy to find the right version for any recipient.
The Taylor Swift Dog The Bounty Hunter T Shirt is more than just a fashion item—it is a gift that blends humor, meaning, and pop culture. Whether for a Swiftie, a Dog Chapman fan, or someone who appreciates witty designs, this shirt is a thoughtful and entertaining choice.
Its connection to the number 13 adds sentimental value, making it more than just a meme. It is a conversation starter, a tribute to two well-known figures, and a stylish addition to any wardrobe.
If you are searching for a present that is both fun and meaningful, this t-shirt is the perfect option. Surprise your loved ones with a gift that they will enjoy wearing and talking about for years to come.
Finding the right gift can be challenging, especially when you want something meaningful, humorous, and trendy. The Taylor Swift Dog The Bounty Hunter Shirt checks all these boxes. Inspired by a viral meme, this shirt merges humor and pop culture with a deeper significance—the number 13, which holds special meaning for both Taylor Swift and Duane "Dog" Chapman.
Whether you are shopping for a Taylor Swift fan, a follower of Dog the Bounty Hunter, or someone who enjoys quirky fashion statements, this shirt is a great choice. What makes it stand out as a gift, and why is it more than just a piece of clothing? Let’s explore.
1. What Makes a Great Gift?
A memorable gift is more than just an item—it carries meaning, personality, and thoughtfulness.
1.1 Personal Connection and Thoughtfulness
The best gifts show that you understand the recipient’s interests. A generic present might be appreciated, but something that aligns with their passions will feel more special.
For fans of Taylor Swift, this shirt connects to her lucky number 13, a detail that true Swifties recognize and appreciate. For those who follow Duane Chapman, it reflects his journey as a father of 13 children. This connection makes the shirt more than just a trendy item—it becomes a meaningful nod to their favorite celebrity.
1.2 Humor and Entertainment Value
Gifts that make people laugh or start conversations are often the most memorable. This t-shirt does exactly that. The combination of Chapman’s tough persona with Swift’s elegant script font creates a visual contrast that is both unexpected and amusing.
Even those unfamiliar with the backstory will find the design intriguing. It is a gift that invites curiosity and sparks discussions, making it an excellent choice for someone who enjoys lighthearted humor.
Picked For You: Dog The Bounty Hunter Taylor Swift T Shirt
1.3 Everyday Use and Versatility
A great gift is something that can be used regularly. Unlike decorative items that sit on a shelf, a t-shirt is practical and wearable. This particular design works for various settings—casual outings, fan meetups, or even as a statement piece at social events.
The simple black color makes it easy to pair with different outfits, ensuring that it remains a go-to wardrobe item. It is stylish, comfortable, and effortlessly fits into anyone’s fashion collection.
Taylor Swift Dog the Bounty Hunter fan crossover tee
2. Why This Shirt is Perfect for Taylor Swift and Dog Chapman Fans
This Dog The Bounty Hunter Taylor Swift Shirt is more than just a pop culture reference—it carries a deeper meaning that fans will appreciate.
2.1 A Nod to Taylor Swift’s Lucky Number
Taylor Swift has embraced 13 as her lucky number throughout her career. Fans recognize its significance in her life, from her birthdate to major career milestones. Owning a shirt that highlights this number is a subtle yet meaningful way for Swifties to celebrate their favorite artist.
It is not just about fandom—it is about connecting to an element that Taylor Swift herself holds dear.
2.2 Duane Chapman’s Inspiring Story
For Dog Chapman, 13 is a personal milestone. It represents his family, his legacy, and an emotional moment in his life. The birth of his 13th child coincided with the passing of his late wife, making this number deeply significant.
Wearing this shirt is a way for fans to show support for Chapman and acknowledge his journey. It is a tribute to his resilience and dedication to family, making it a meaningful gift for those who admire him.
2.3 A Shirt That Connects Two Unexpected Icons
It is rare to see a design that brings together two figures from such different worlds. Taylor Swift, a global music sensation, and Duane Chapman, a legendary bounty hunter, might not seem like they have anything in common. Yet, this shirt cleverly links them through their shared connection to 13.
This unexpected pairing adds to the shirt’s appeal, making it a fascinating and amusing gift idea. It is perfect for someone who loves pop culture references with a deeper twist.
See It Here: Celebrate Fandom and Humor Taylor Swift Dog The Bounty Hunter T Shirt
3. A Fun and Practical Gift for Any Occasion
Whether for a birthday, holiday, or just a thoughtful surprise, this t-shirt is a versatile gift choice.
3.1 Ideal for Birthdays and Special Events
A birthday gift should reflect the recipient’s personality. If they love Taylor Swift, Dog Chapman, or internet culture, this shirt is an excellent pick. It is unique, entertaining, and carries a deeper story.
It also works well for themed parties, casual gatherings, or fan events where people love discussing pop culture.
3.2 A Great Choice for Holidays and Celebrations
During holidays, finding gifts that are both personal and practical can be tricky. This t-shirt solves that problem. It blends humor with sentiment, making it an ideal choice for Christmas, New Year, or any festive occasion.
Since it is available in different sizes and styles, it suits a wide range of recipients, making holiday shopping easier.
3.3 A Fun Surprise for Meme and Pop Culture Enthusiasts
Some of the best gifts are the ones people do not expect. If you know someone who enjoys internet memes, pop culture crossovers, or quirky fashion, this shirt will be a delightful surprise.
It is the kind of gift that stands out, making the recipient appreciate the thought behind it.
Limited edition Taylor Swift x Dog the Bounty Hunter shirt
4. Quality and Comfort – More Than Just a Trendy Shirt
Beyond its meaning and humor, the t-shirt offers quality and comfort, making it a great addition to anyone’s wardrobe.
4.1 Comfortable Fabric for Everyday Wear
A good t-shirt should feel as good as it looks. Made from soft material, this shirt provides comfort for daily use. It is lightweight, breathable, and designed for long-lasting wear.
4.2 Durable Print That Stays Vibrant
The design is printed using high-quality techniques to prevent fading. Whether worn frequently or washed multiple times, the text and image remain clear and sharp.
4.3 Available in Multiple Styles and Sizes
This t-shirt is available in various fits, including unisex, women’s, and oversized options. There are also other product variations, such as hoodies and tank tops, allowing buyers to choose the perfect style.
These options make it easy to find the right version for any recipient.
The Taylor Swift Dog The Bounty Hunter T Shirt is more than just a fashion item—it is a gift that blends humor, meaning, and pop culture. Whether for a Swiftie, a Dog Chapman fan, or someone who appreciates witty designs, this shirt is a thoughtful and entertaining choice.
Its connection to the number 13 adds sentimental value, making it more than just a meme. It is a conversation starter, a tribute to two well-known figures, and a stylish addition to any wardrobe.
If you are searching for a present that is both fun and meaningful, this t-shirt is the perfect option. Surprise your loved ones with a gift that they will enjoy wearing and talking about for years to come.
Last edited by roballen on Mon Sep 15, 2025 9:11 am, edited 4 times in total.
Re: 4864 DRAM
I dug through my notes and found the following:
D06- had NEC UPD4164C-3 (seen once)
D06- had Hitachi HM4864P2
D09- had Siemens HYB4164P2
D09- had TI TMS4164-15NL (most common)
D09- had Mostek MK4564-15
S18- had TI TMS4164-12NL
Others I haven't seen but listed in the service manual include MCM6665AP15 by Motorola and MSM3764-15RS by OKI.
Generally, any of the standard 4164 clones in the 120 - 150nS speed grades are preferable.
D06- had NEC UPD4164C-3 (seen once)
D06- had Hitachi HM4864P2
D09- had Siemens HYB4164P2
D09- had TI TMS4164-15NL (most common)
D09- had Mostek MK4564-15
S18- had TI TMS4164-12NL
Others I haven't seen but listed in the service manual include MCM6665AP15 by Motorola and MSM3764-15RS by OKI.
Generally, any of the standard 4164 clones in the 120 - 150nS speed grades are preferable.