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Help identify possible XT IDE card and uses

Robin4 said:
No its an IDE-AT controller in 8-bit form..
The harddisks that is connected to, is an AT style harddisk.. Maybe this controller can candle both by setting some jumpers.
Click to expand...
If I was designing an IDE-AT controller for an AT-class computer, I would keep everything as 16 bits, for speed and simplicity.

Forcing 16 bits to/from an IDE-AT drive through an 8-bit slot not only slows things down, but the card is more complex (i.e. greater production cost, and cost to consumer).

The only reason I would create an 8-bit IDE-AT controller is if the intended market is owners of XT-class computers. That is the reason why I consider Maxheap's card to be an XT-class one.
 
That wouldnt be possible to design it as 16-bit controller (as for XT machines), because this controller card wasnt mented for an AT class style computer.. It was designed for an XT compatible system that only have 8-bit isa slots.

AT style 8-bit controllers where needed in late XT period because for people who had an XT style class computer and wanted the new type of interface having installed in their computers.. (and for faster storing and being compatible why future harddisk drives.)

The type `AT` doesnt say much if it was only made for 16-bit class computers.. It only says what kind of interface language is used.. I know that XT-IDE wasnt very populair back in the days, because those drives failing to much often.
MFM / RLL where more reliable.. SCSI was back in the days to expensive for regular consumers. So the step-up to AT class drives where quickly made.
 
modem7 said:
The preferred way of getting a ROM image is via an EPROM programmer. That is because sometimes, the content of the ROM is different to how the PC 'sees' it. An example is the ROM in an IBM EGA card. If someone created a ROM image file by using a program (such as DEBUG), and then used that file (unmodified) to make a replacement ROM, that replacement ROM would not work in an IBM EGA card.

But in most cases, the PC 'sees' the ROM contents exactly as it is laid out in the ROM.

The ROM in your IDE card is socketed, and you are asking for instructions. That tells me that you do not have an EPROM programmer. So, we will have to use a program.

The ROM in almost all XT-class hard disk controllers starts at address C8000, so we will assume that (for now at least). Your ROM is 32KB sized (a 27C256).

So use DEBUG in the following way to create the 32KB sized image file (named MYROM.BIN), and then email the file to me at temp6432836@outlook.com.au
.
Click to expand...


From the ROM..



AT-BUS IDE HARD DISK DRIVE INTERFACE ADAPTER IN XT, VERSION 1.2 Copyright 1990, 1991 JUKO

Selection of Hard Disk Drive From Table Below:
TYPE CYL HEAD CAPACITY TYPE CYL HEAD CAPACITY TYPE CYL HEAD CAPACITY
1 306 4 10 MB 21 733 7 42 MB 41 1024 5 42 MB
2 615 4 20 MB 22 733 5 30 MB 42 981 5 40 MB
3 615 6 30 MB 23 306 4 10 MB 43 981 10 81 MB
4 940 8 62 MB 24 977 5 40 MB 44 615 8 40 MB
5 940 6 46 MB 25 1024 9 76 MB 45 963 10 80 MB
6 615 4 20 MB 26 1224 7 71 MB 46 753 16 100 MB
7 462 8 30 MB 27 1224 11 111 MB
8 733 5 30 MB 28 1224 15 152 MB
9 900 15 112 MB 29 1024 8 68 MB
10 820 3 20 MB 30 1024 11 93 MB
11 855 5 35 MB 31 918 11 83 MB
12 855 7 49 MB 32 925 9 69 MB
13 306 8 20 MB 33 1024 10 85 MB
14 733 7 42 MB 34 1024 12 102 MB
15 RESERVED 35 1024 13 110 MB
16 612 4 20 MB 36 1024 14 119 MB
17 977 5 40 MB 37 1024 2 17 MB
18 977 7 56 MB 38 1024 16 136 MB
19 1024 7 59 MB 39 918 15 114 MB
20 733 5 30 MB 40 820 6 40 MB
 
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