fallemarg
Experienced Member
Hello everyone. My apologies for intruding, but as the thread title says, I just recently got the first IBM PC compatible Family computer that we had when I was younger back. A terrible Packard Bell Legend 115 Plus. It's an awful machines, but I love it so much. I have a lot of memories attached to it like the Amiga 1000 that I used to play Sierra games on with my father. Back on topic, the machine's NiCd battery did leak, but I got that cleaned up and an external battery installed. There was some damage, but with help I got it repaired and sealed to hopefully protect it moving forward.
But I need a little help. The video ram for the Headland Technologies Video card was expanded to 1MB, but the 512KB ZIP chip used to expand it died. Also the machine never had any L2 cache installed and I would like to do this. I understand that it will take either 32Kx8 SRAM chips at 28 pins in DIP or another 32 pin DIP at I believe 128Kx8 for either up to 128KB or cache or 512KB of cache. The PB 410/420/420T (mine is a 420 Rev C.0, I believe..) Motherboard doesn't do 256K of cache apparently. I have found a replacement 256Kx16 ZIP chip, but I cannot find a data sheet for it and the information indicates that the Video Ram needs to be asynchronous. Is there a specific way of identifying if the chip found is asynchronous from the numbering on the package? I can tell that it is 70ns, but my knowledge of ram identifier numbers is limited. The package labels the chip as an NEC D424170V-70.
In regards to the Cache apparently 28 pin 15ns SRAM DIP chips can still be purchased from Mouser. The thing that I am running into is the L2 Cache TAG chip. Is this just a 5th chip of the same type that is used at the RAM table or is it a specific chip? Any help in this endeavor would be greatly appreciated. I am hunting for a replacement CRT because the 1020 monitor we had died and if anyone has any information in regards to that I would be appreciative. I am also looking for an oddity and I thought the people here might know some more information about it. I was looking through the old Computer ads from when we purchased our Packard Bell in 1993 and I keep seeing a speaker device show up with the Multimedia PB machines. It looks just like the Labtec LC1000 or Tandy MMS-10 except that it is branded Packard Bell, if anyone has any info on that I would be very appreciative. I have tried doing some searches on google, but it just turns up the Labtec and Tandy speaker set ups. Thank you in advance for any assistance you can provide. I appreciate the help and hope to learn more from here as time progresses.
Kind Regards,
Fallemarg
But I need a little help. The video ram for the Headland Technologies Video card was expanded to 1MB, but the 512KB ZIP chip used to expand it died. Also the machine never had any L2 cache installed and I would like to do this. I understand that it will take either 32Kx8 SRAM chips at 28 pins in DIP or another 32 pin DIP at I believe 128Kx8 for either up to 128KB or cache or 512KB of cache. The PB 410/420/420T (mine is a 420 Rev C.0, I believe..) Motherboard doesn't do 256K of cache apparently. I have found a replacement 256Kx16 ZIP chip, but I cannot find a data sheet for it and the information indicates that the Video Ram needs to be asynchronous. Is there a specific way of identifying if the chip found is asynchronous from the numbering on the package? I can tell that it is 70ns, but my knowledge of ram identifier numbers is limited. The package labels the chip as an NEC D424170V-70.
In regards to the Cache apparently 28 pin 15ns SRAM DIP chips can still be purchased from Mouser. The thing that I am running into is the L2 Cache TAG chip. Is this just a 5th chip of the same type that is used at the RAM table or is it a specific chip? Any help in this endeavor would be greatly appreciated. I am hunting for a replacement CRT because the 1020 monitor we had died and if anyone has any information in regards to that I would be appreciative. I am also looking for an oddity and I thought the people here might know some more information about it. I was looking through the old Computer ads from when we purchased our Packard Bell in 1993 and I keep seeing a speaker device show up with the Multimedia PB machines. It looks just like the Labtec LC1000 or Tandy MMS-10 except that it is branded Packard Bell, if anyone has any info on that I would be very appreciative. I have tried doing some searches on google, but it just turns up the Labtec and Tandy speaker set ups. Thank you in advance for any assistance you can provide. I appreciate the help and hope to learn more from here as time progresses.
Kind Regards,
Fallemarg
Last edited: