Hello! Okay yesterday I was indeed able to work out how to move files between this laptop and the TRS-80 Model 102 I own. It involved DOSbox and a serial cable who used the FTDI chipset and a nullmodem connector. DOSbox was setup to be a slow 80386DX. And running the unique software that the company commissioned I was able to basically do that. Ironically the disk drives the thing uses, and I do not have here were the same ones that Brother optioned for their knitting machines. The unit uses for memory a 6264 chip which I know is a static RAM chip organized the same as the EPROM 2764. I stuck one of mine in, and it seems to have found it. But has anyone ever seen a 62128 (Static RAM same as a EPROM 27128), or a 62256 (Static RAM same as a EPROM 27256) someplace? ---- Gregg C Levine gregg.drwho8@gmail.com "This signature was once found posting rude messages in English in the Moscow subway."
On 2/14/26 10:24, Gregg Levine via vcf-midatlantic wrote:
Okay yesterday I was indeed able to work out how to move files between this laptop and the TRS-80 Model 102 I own. It involved DOSbox and a serial cable who used the FTDI chipset and a nullmodem connector. DOSbox was setup to be a slow 80386DX. And running the unique software that the company commissioned I was able to basically do that.
Ironically the disk drives the thing uses, and I do not have here were the same ones that Brother optioned for their knitting machines. The unit uses for memory a 6264 chip which I know is a static RAM chip organized the same as the EPROM 2764. I stuck one of mine in, and it seems to have found it.
But has anyone ever seen a 62128 (Static RAM same as a EPROM 27128), or a 62256 (Static RAM same as a EPROM 27256) someplace?
62256s are common, and are the same format as a 27256, with a slight pinout difference. (A14 vs. /WR vs. Vpp) There are 62128s, but a very different kind, not the same format as a 27128 EPROM. The 62128 is 128K*8, while the 27128 is 16K*8. This is a source of confusion when people compare them to 62256s, which are 32K*8. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
On 2/14/26 10:56 AM, Dave McGuire via vcf-midatlantic wrote:
On 2/14/26 10:24, Gregg Levine via vcf-midatlantic wrote:
Okay yesterday I was indeed able to work out how to move files between this laptop and the TRS-80 Model 102 I own. It involved DOSbox and a serial cable who used the FTDI chipset and a nullmodem connector. DOSbox was setup to be a slow 80386DX. And running the unique software that the company commissioned I was able to basically do that.
Ironically the disk drives the thing uses, and I do not have here were the same ones that Brother optioned for their knitting machines. The unit uses for memory a 6264 chip which I know is a static RAM chip organized the same as the EPROM 2764. I stuck one of mine in, and it seems to have found it.
Okay that's confusing. Not quite following.
But has anyone ever seen a 62128 (Static RAM same as a EPROM 27128), or a 62256 (Static RAM same as a EPROM 27256) someplace?
62256s are common, and are the same format as a 27256, with a slight pinout difference. (A14 vs. /WR vs. Vpp)
There are 62128s, but a very different kind, not the same format as a 27128 EPROM. The 62128 is 128K*8, while the 27128 is 16K*8. This is a source of confusion when people compare them to 62256s, which are 32K*8.
-Dave
Ah the lovely 62128 16kx8 SRAM, never could figure out why they were made when the 62256 was common place. Didn't seem to fit the pattern of the 2K, 8K, & 32k SRAM at the time. The 62128 16Kx8 do exist but they are rare. I don't have any (I think). Everyone is now using the number as 128Kx8 SRAM much more confusion. As Dave notes 6116, 6264 and 62256 are the common SRAM in JDEC form. Not a 100% match for the equivalent ROM. You can get pulls from Ebay but there are other who sell pulls or old stock such as: https://www.questcomp.com/searchresults.aspx -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies KD2ZRQ
On 2/14/26 11:48, Neil Cherry wrote:
62256s are common, and are the same format as a 27256, with a slight pinout difference. (A14 vs. /WR vs. Vpp)
There are 62128s, but a very different kind, not the same format as a 27128 EPROM. The 62128 is 128K*8, while the 27128 is 16K*8. This is a source of confusion when people compare them to 62256s, which are 32K*8.
Ah the lovely 62128 16kx8 SRAM, never could figure out why they were made when the 62256 was common place. Didn't seem to fit the pattern of the 2K, 8K, & 32k SRAM at the time.
The 62128 16Kx8 do exist but they are rare. I don't have any (I think). Everyone is now using the number as 128Kx8 SRAM much more confusion.
As Dave notes 6116, 6264 and 62256 are the common SRAM in JDEC form. Not a 100% match for the equivalent ROM.
You can get pulls from Ebay but there are other who sell pulls or old stock such as:
Huh! I've never seen any of those, in anything, anywhere. I wonder if they are 62256 dies that were binned. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
On 2/14/26 1:00 PM, Dave McGuire via vcf-midatlantic wrote:
On 2/14/26 11:48, Neil Cherry wrote:
62256s are common, and are the same format as a 27256, with a slight pinout difference. (A14 vs. /WR vs. Vpp)
There are 62128s, but a very different kind, not the same format as a 27128 EPROM. The 62128 is 128K*8, while the 27128 is 16K*8. This is a source of confusion when people compare them to 62256s, which are 32K*8.
Ah the lovely 62128 16kx8 SRAM, never could figure out why they were made when the 62256 was common place. Didn't seem to fit the pattern of the 2K, 8K, & 32k SRAM at the time.
The 62128 16Kx8 do exist but they are rare. I don't have any (I think). Everyone is now using the number as 128Kx8 SRAM much more confusion.
As Dave notes 6116, 6264 and 62256 are the common SRAM in JDEC form. Not a 100% match for the equivalent ROM.
You can get pulls from Ebay but there are other who sell pulls or old stock such as:
Huh! I've never seen any of those, in anything, anywhere. I wonder if they are 62256 dies that were binned.
That would make some sense. Oddly enough I have run across them and 4K SRAM. They're rare but a bad die would make a lot of sense. I can't recall the 4K part number but it wasn't close to the typical 61xxx or 62xxx patterns. Think it sort of looks like a DRAM part number. -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies KD2ZRQ
participants (3)
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Dave McGuire -
Gregg Levine -
Neil Cherry