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
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During the holiday that brings an indescribable warmth to everyone’s soul, transforming ordinary moments into magical memories, people find themselves drawn to expressions of festive joy in various forms. This is where the Buc ee's Christmas Shirt comes into play as a seasonal celebration symbol that carries meanings deeper than its surface appeal, becoming a vessel of tradition, connection, and the timeless magic that makes Christmas special.
The Magic of Christmas Fashion
1. Role of Festive Wear in Holiday Celebrations
Holiday-themed clothing transforms ordinary gatherings into memorable celebrations. Whether at family dinners, office parties, or community events, festive attire creates an atmosphere of shared joy. By breaking down social barriers and initiating conversations, they foster connections between people during this special time.
The presence of themed clothing at holiday events adds layers of meaning to celebrations, creating visual harmony among participants. Through shared visual elements, festival clothing builds a sense of unity and belonging among celebration participants.
2. Impact of Holiday-themed Clothing on Mood
Since festive clothing triggers positive emotions and increases feelings of connection to the holiday spirit, putting on a Christmas-themed garment can elevate mood and enhance the overall holiday experience.
The psychological boost extends beyond the wearer to observers, creating a ripple effect of positive emotions. This phenomenon, known as enclothed cognition, demonstrates how holiday attire influences both behavior and emotional states.
3. Evolution of Christmas Fashion Trends
Holiday fashion has evolved from formal wear to casual, comfortable options that maintain festive appeal. This evolution reflects changing lifestyles while preserving the essence of holiday traditions through contemporary designs that blend classic motifs with current fashion sensibilities, creating pieces that resonate with modern preferences.
Its universal appeal allows it to bring families and groups together
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1. Signature Red Color Symbolism
The vibrant red base color of the shirt immediately captures the Christmas spirit. This carefully selected shade mirrors the warmth of holiday celebrations, creating an instant visual connection to the season's festivities. Serving as the perfect backdrop for the playful design elements, this color choice thoughtfully considers traditional Christmas symbolism while maintaining contemporary appeal. In essence, the specific shade chosen balances visibility with sophistication, making the tee suitable for various holiday settings.
2. Beloved Beaver Mascot in Santa Hat
With the image of Bucee's iconic mascot donning a charming Santa hat, this whimsical interpretation combines familiar holiday imagery with the brand's beloved character. The result is a delightful design that brings smiles to faces and adds a touch of playfulness to holiday wear. The mascot's expression and pose have been carefully crafted to convey essential elements of the Christmas spirit. Similarly, the integration of the red hat can transform the familiar icon into a seasonal ambassador, creating an immediate emotional connection with viewers.
3. Christmas Tree and Gift Illustrations
The back design of the Buc ee's Christmas T Shirt features a meticulously crafted holiday scene - a beautifully adorned Christmas tree stands surrounded by carefully wrapped presents, thoughtfully positioned to create a balanced and appealing composition that tells a story of holiday magic. Every detail, from ornament placement to gift wrapping patterns of the T-shirt, indeed contributes to the overall narrative of the fun.
The bright red color immediately catches the eye, symbolizing the warmth and joy of Christmas
4. The Special Message Placement
The inspirational message "Believe in the Magic of Christmas" appears in prominent lettering to create visual harmony with the illustrated elements. It serves as a gentle reminder of the season's enchanting nature. The font choice balances readability with decorative elements, ensuring the message remains clear while maintaining festive appeal.
Comfort Meets Festive Spirit
1. All-age Appropriate Design
The shirt's design appeals to people of all ages. Children appreciate the playful beaver character, while adults connect with the meaningful message. This multi-generational appeal makes it an ideal choice for family holiday gatherings and photos.
As the design elements have been carefully balanced to avoid appearing too juvenile or overly sophisticated, this holiday merchandise bridges generational gaps, creating shared experiences and conversations between family members of different ages.
2. Versatile Wearing Occasions
From casual shopping trips to holiday parties, this shirt adapts to various settings and perfectly balances festive enthusiasm and tasteful design. The versatility extends to different styling options with jeans, skirts, or layered under jackets.
The fabric quality also allows for comfortable wear during extended periods, essential for long holiday gatherings or shopping expeditions. Therefore, style-conscious wearers can appreciate its adaptability to different accessory combinations and layering possibilities.
3. Gift-giving Potential
As a thoughtful present, this shirt transcends ordinary clothing gifts. It carries meaning and spreads joy beyond the material value because recipients usually appreciate both the practical aspect and the emotional connection to the holiday season.
Plus, its size range accommodates various body types, reducing the stress of gift selection. The design's broad appeal also makes it suitable for multiple recipient categories, from family members to colleagues.
Spreading Joy Through Wearable Art
1. Community Impact of Festive Clothing
Wearing holiday-themed clothing creates a ripple effect of positivity in communities. It encourages others to embrace the festive spirit and often leads to meaningful interactions, bridging gaps between strangers and strengthening community bonds.
People wearing festive attire often experience positive responses from others. The shared experience of holiday clothing creates temporary communities among wearers, fostering a sense of belonging during the season.
2. Creating Memorable Holiday Moments
In fact, this magical tee is capable of being part of cherished holiday photographs and stories, and when years pass, these garments will evoke fond memories of specific Christmas celebrations and the joy shared with loved ones.
Families often coordinate their holiday wear, making this shirt part of treasured family traditions. Its presence in holiday activities adds a festive touch to ordinary moments, transforming them into special memories. The shirt's durability ensures it remains a keepsake of the 2024 holiday season.
3. Sharing the Message of Belief
Beyond its visual appeal, the shirt carries a powerful message about believing in magic. It reminds wearers and observers alike to maintain childlike wonder during the holiday season. This subtle encouragement to embrace joy and wonder makes it significantly valuable.
The message resonates with personal holiday experiences and traditions that create emotional connections. Wearing the Christmas Buc ee's Shirt spreads optimism and holiday spirit throughout communities, reinforcing positive holiday associations and memories.
This festive apparel represents much beyond a piece of seasonal clothing—it embodies the spirit of the holidays through thoughtful design elements and meaningful messages. By combining comfort, style, and festive charm, the design becomes a medium for spreading holiday cheer, and creating connections and memories that last for years. As we embrace the magical season ahead, this shirt stands as a reminder to believe in the wonder of Christmas and share that joy with others.
Last edited by roballen on Tue Dec 17, 2024 3:23 am, edited 3 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.